List of the Paleozoic life of Utah

{{Compact TOC}}

• †Acanthopecten
• †Acanthopecten carboniferus
• †Acanthopecten coloradoensis
• †Achlysopsis
• †Achlysopsis liokata – or unidentified comparable form
• †Achlysopsis punctatum
• †Acidiphorus
• †Acidiphorus brevis – or unidentified comparable form
• †Acidiphorus brevus
• †Acidiphorus brighti
• †Acidiphorus pseudobathurus
• †Acidiphorus unicorna – type locality for species
• †Acidiphorus wahwahensis
• †Acidiphorus williamsi – type locality for species
• †Acinocricus
• †Acinocricus stichus
• †Acodus
• †Acodus similaris
• †Acontiodus
• †Acontiodus coniformis
• †Acrothele
• †Acrothele subsidua
• †Acrotreta
• †Adiantites
• †Adiantites tenuifolius
• †Aesiocrinus
• †Aesiocrinus secundus – type locality for species
• File:Agnostus pisiformis Kinnekulle 1 CRF.jpg]] †Agnostus
• †Agnostus neglectus
• †Allorisma
• †Allorynchus
• †Alokistocare
• †Alokistocare carnatum
• †Alokistocare harrisi
• †Alokistocare idahoense
• †Alokistocare normale
• †Alokistocare subcoronatum
• †Alokistocarella
• †Alokistocarella brighamensis
• †Altiocculus
• †Altiocculus concavus
• †Altiocculus drumensis
• †Amblycranium
• †Amblycranium cornutum
• †Amblycranium linearus – type locality for species
• †Amblycranium variabile
• †Amecephalus
• †Amecephalus laticudum
• †Ameura – tentative report
• †Ammagnostus
• †Ammagnostus beltensis
• †Amphiscapha
• †Amplexizaphrentis
• †Amplexizaphrentis paucicinctus
• †Amplexizaphrentis spinulosus
• †Amplexizaphrentis subcrassus
• †Amplexocarina
• †Amplexus{{clarify|date=February 2018}}
• †Anabarochilna
• †Anabarochilna australis – or unidentified comparable form
• †Ananias
• †Ananias nevadensis – or unidentified related form
• †Ancillotoechia
• †Ancillotoechia perryi – type locality for species
• †Anemonaria
• †Anemonaria delicatula
• †Angulotreta
• †Angyomphalus
• †Angyomphalus regularis
• †Anidanthus
• †Anidanthus echaris
• †Anisopyge
• †Anisotrypa
• †Annularia
• †Annularia stellata
• †Annulispongia – type locality for genus
• †Annulispongia interrupta – type locality for species
• File:AnomalocarisDinoMcanb.jpg]] †Anomalocaris
• †Anomalocaris nathorsti
• †Anomalorthis
• †Anomalorthis lambda
• †Anomalorthis oklahomensis
• †Anomalorthis utahensis
• †Anomphalus
• †Anomphalus rotulus
• †Anthaspidella
• †Anthracospirifer
• †Anthracospirifer increbescens
• †Anthracospirifer leidyi
• †Anthracospirifer occiduus
• †Antiquatonia
• †Antiquatonia portlockianus
• †Antiquatonia sulcatus – or unidentified comparable form
• †Apachella
• †Apatognathus
• †Aphelaspis
• †Aphelaspis haguei
• †Aphelotoxon
• †Aphelotoxon acuminata
• †Apheoorthis
• †Apheoorthis melita – or unidentified comparable form
• †Apheorthis
• †Apheorthis meeki – or unidentified comparable form
• †Archaeocalamites
• †Archaeocalamites scrobiculatus
• †Archaeocothurnus – tentative report
• †Archaeocothurnus bifida – type locality for species
• †Archaeoscyphia
• †Archaeoscyphia rossi
• †Archeocalamites
• †Archeocalamites radiatus
• †Archeoschyphia
• File:Fenestellidae - Archimedes species.JPG]] †Archimedes
• †Archimedes macfarlani
• †Archimedes owenanus
• †Arcuolimbus
• †Arenicolites
• †Arroyocrinus
• †Arroyocrinus stokesi – type locality for species
• †Arthrophycus – tentative report
• †Artisia
• †Asaphelina
• †Asaphellus – tentative report
• File:Asaphiscus wheeleri grey CRF.jpeg]] †Asaphiscus
• †Asaphiscus wheeleri
• †Ascopora
• †Ascopora macellata
• †Astartella
• †Astartella subquadrata
• †Asterophyllites
• †Asterophyllites charaeformis
• †Asterophyllites equisetiformis
• †Asterophyllites longifolius
• †Athabaskia
• †Athabaskia bithus
• †Athabaskia wasatchensis
• †Athyridacid
• †Athyris
• †Athyris lamellosa
• File:Atrypa reticularis pedunculate Gondelsheim CRF.jpg]] †Atrypa
• †Atrypa hedei
• †Atrypa parva – or unidentified comparable form
• †Atrypid
• †Aulacoparia – tentative report
• †Aulacoparia quadrata
• †Aulacoparia venta
• †Aulacotheca
• †Aulacotheca campbellii
• †Aulacotheca hemingwayi
• †Aulopora – tentative report
• †Aviculopecten
• †Aviculopecten girtyi
• †Aviculopecten kaibabensis – or unidentified comparable form
• †Aviculopinna
• †Aviculopinna peracuta – tentative report
• File:Aysheaia pedunculata.jpg]] †Aysheaia

{{Compact TOC}}

• †Babylonites
• †Babylonites conoideus
• †Bakevellia
• †Baltagnostus
• †Baltagnostus eurypyx
• †Barrandia – tentative report
• †Bathymyonia
• †Bathymyonia nevadensis
• †Bathyurellus
• †Bathyurellus feitleri
• †Bathyurellus pogonipensis
• †Bathyurellus pogonopensis
• †Bathyurellus teretus – type locality for species
• †Bathyuriscus
• †Bathyuriscus brighamensis
• †Bathyuriscus elegans
• †Bathyuriscus fimbriatus
• †Bathyuriscus wasatchensis
• †Bayfieldia
• †Bearriverops
• †Bearriverops alsacharovi – type locality for species
• †Bearriverops borderinnensis – type locality for species
• †Bearriverops deltaensis – type locality for species
• †Bearriverops ibexensis – type locality for species
• †Bearriverops loganensis
• †Beckwithia
• †Beckwithia typa
• †Belemnospongia
• †Belemnospongia neofascicularis – type locality for species
• †Bellazona
• †Bellazona bella
• †Bellazona polita – type locality for species
• †Bellefontia
• †Bellefontia acuminiferentis
• †Bellefontia chamberlaini
• †Bellefontia ibexensis
• †Benthamaspis
• †Benthamaspis diminutiva
• †Benthamaspis gibberula – type locality for species
• †Benthamaspis obrepta
• †Beyrichoceras
• †Bighornia
• †Billingsella
• †Biscoia
• †Blastoidocrinus
• †Blastoidocrinus carchariaedens – or unidentified comparable form
• †Blountia
• †Bolaspidella
• †Bolaspidella contracta
• †Bolaspidella housensis
• †Bolaspidella type locality for species – informal
• †Bolaspidella wellsvillensis
• †Bolbocephalus
• †Bollandoceras
• †Bollandoceras occidentale – type locality for species
• †Bonneterrina
• †Bourbonnella
• †Bourbonnella jocelynae – type locality for species
• †Bowmania
• †Brachyaspidion
• †Brachyaspidion microps
• †Brachyaspidion sulcatum
• †Brachyprion
• †Brachyprion geniculata
• †Brachythyris
• File:Branchiocaris.jpg]] †Branchiocaris
• †Branchiocaris pretiosa
• †Brassicicephalus
• †Breckwithia
• †Breckwithia typa
• †Brodioptera
• †Brodioptera stricklani – type locality for species
• †Bromella
• †Brooksella
• †Bucania
• †Bythicheilus
• †Bythicheilus typicum

{{Compact TOC}}

• †Cactocrinus
• †Cactocrinus arnoldi
• File:Calamites stems.JPG]] †Calamites
• †Calamites cistii – or unidentified comparable form
• †Calamites cistiiformis
• †Calamites gigas
• †Calamites hesperius
• †Calamites infractus
• †Calamites suckowii
• †Calamostachys – tentative report
• †Calathium
• †Calathium yersini – type locality for species
• †Callipteris – tentative report
• †Callocladia
• †Callocladia jensensis
• †Calycocoelia
• †Calygirtyoceras
• †Calygirtyoceras arcticum
• †Calygirtyoceras confusionense – type locality for species
• †Camarotoechia
• †Cambromedusa – type locality for genus
• †Cambromedusa furcula – type locality for species
• †Camerella
• †Campbelloceras – tentative report
• File:Canadaspis perfecta.JPG (left)]] †Canadaspis
• †Canadaspis perfecta – or unidentified comparable form
• †Canadia
• †Canadiphyllum
• †Cancrinella
• †Cancrinella phosphatica – or unidentified comparable form
• †Caninaphyllum
• †Caninaphyllum incrussatum
• †Caninia
• †Caninia torquia
• †Caninophyllum
• †Canthylotreta
• †Canthylotreta marjumensis
• †Cardiomorpha
• †Cardiopteris
• †Cardiopteris hirta – or unidentified comparable form
• †Carolinites
• †Carolinites ekphymosus
• †Carolinites genacinaca – type locality for species
• †Carolinites killarnyensis
• †Carolinites killaryensis
• †Castericystis
• †Castericystis sprinklei – type locality for species
• †Castericystis vali – type locality for species
• †Catoraphiceras
• †Catoraphiceras colon
• †Caulpsis
• †Caulpsis punctata
• †Cavusgnathus
• †Cavusgnathus regularis
• †Cavusgnathus unicornis
• File:Cedaria minor CRF.jpg]] †Cedaria
• †Cedaria minor
• †Cedarina – tentative report
• †Cenorhynchia
• †Cenorhynchia type locality for species A – informal
• †Cernuolimbus
• †Cernuolimbus granulosus
• †Chaenomya
• †Chaetetes
• †Chaetetes milleporaceous
• †Chancelloria
• †Chancelloria eros
• †Chancelloria pentacta – type locality for species
• †Chancia)
• †Chancia ebdome – or unidentified comparable form
• †Chanciaopsis – type locality for genus
• †Chanciaopsis heteromorphos – type locality for species
• †Chanciopsis
• †Chanciopsis heteromorphos
• †Cheilocephalus
• †Chilotrypa
• File:Choia carteri reconstruction.JPG]] †Choia
• †Choia carteri
• †Choia hindei
• †Choia ridleyi
• †Choia utahensis
• †Chondrites
• †Chonetes
• †Chonetina
• †Chonetina flemingi
• †Choristites
• †Choristites fritschi – or unidentified comparable form
• †Choristites pavlovi – or unidentified comparable form
• File:Cladochonus coral KGS.jpg]] †Cladochonus
• †Clathrospira – tentative report
• †Clavagnostus
• †Clavagnostus repandus
• †Cleiothyridina
• †Cleiothyridina type locality for species A – informal
• †Cleiothyridina type locality for species B – informal
• †Clelandia
• †Clelandia utahensis
• †Cliothyridina
• †Cliothyridina orbicularis
• †Clonograptus
• †Coelogasteroceras
• †Coenites
• †Colinispongia
• †Colinispongia regularis
• File:Compositafossil.jpg]] †Composita
• †Composita argentea
• †Composita mira
• †Composita ovata
• †Composita parasulcata
• †Composita plana
• †Composita subtilita
• †Composita trilobata
• †Composita trinuclea
• †Condrathyris
• †Condrathyris perplexa
• †Conotreta
• †Conotreta millardensis
• †Coosella
• †Coosina
• †Cordaianthus
• †Cordaianthus pseudofluitans
• †Cordaicarpus
• †Cordaicarpus binutus – type locality for species
• †Cordaicarpus cordatus
• †Cordaicarpus elongatus
• †Cordaicarpus globosus – type locality for species
• †Cordaicarpus jayshulerii – type locality for species
• †Cordaicarpus manningcanensis – type locality for species
• File:Cordaites fossil cropped.png]] †Cordaites
• †Cordaites angulosostriatus
• †Cordaites principalis
• †Cordaites Sp. A – informal
• †Cordaites Sp. B – informal
• †Cornucarpus
• †Cornucarpus longicaudatus – type locality for species
• †Corynepteris
• †Corynepteris angustissima
• †Costellarina
• †Cotalagnostus
• Crania
• †Crania rowleyi
• †Cravenoceras
• †Crepicephalus
• †Crossopteris – type locality for genus
• †Crossopteris mcknightii – type locality for species
• †Crossopteris undulata – type locality for species
• †Crossopteris utahensis – type locality for species
• †Crurithyris
• †Crurithyris arcuatus – or unidentified comparable form
• †Crurithyris expansa – tentative report
• †Cruziana
• †Ctenalosia
• †Ctenalosia fixata
• †Ctenocystis
• †Ctenocystis utahensis
• †Ctenospondylus
• †Ctenospondylus casei – or unidentified related form
• †Cyathaxonia
• †Cyathocarpus
• †Cyathocarpus arborescens
• †Cyathocarpus cyatheus
• †Cybeloides
• †Cybelopsis
• †Cybelopsis speciosa
• File:Cyclopteris fossil cropped.png]] †Cyclopteris
• †Cyclopteris dilatata
• †Cymatospira
• †Cymatospira montfortianus
• †Cymbiocrinus
• †Cymbiocrinus anatonus – type locality for species
• †Cymbiocrinus cuneatus – type locality for species
• †Cyperites
• †Cyperites bicarinatus
• †Cyrtia
• †Cyrtina
• †Cyrtorostra
• †Cystodictya
• †Cystodictya astrepta

{{Compact TOC}}

• †Dalmanellida
• †Deiracephalus
• †Delaria
• †Delaria sevilloidia
• †Delocrinus
• †Delocrinus subhemisphericus
• †Deltina – type locality for genus
• †Deltina limba – type locality for species
• Dentalium
• †Derbyia
• †Derbyia bennetti
• †Derbyia crassa
• †Derbyia sulca
• †Derbyia wabashensis
• †Desmoinesia
• †Desmoinesia muricatina
• †Diacanthaspis
• †Diacanthaspis trispineus – type locality for species
• File:Diadectes1DB.jpg]] †Diadectes
• †Diagoniella
• †Diagoniella cyathiformis
• †Diagoniella hindei
• †Diagoniella magna – type locality for species
• †Diagoniella robisoni – type locality for species
• †Diaphragmus
• †Diaphragmus cestriensis
• †Dicanthopyge
• †Dicanthopyge convergens
• †Dicranocaris
• †Dicranocaris guntherorum
• †Dictyoclostus
• †Dictyoclostus burlingtonensis
• †Dictyoclostus inflatus
• †Dictyonema
• †Dictyonema flabelliforme – or unidentified comparable form
• File:Didymograptus murchisoni small.jpg]] †Didymograptus
• †Didymograptus artus
• †Didymograptus bifidus
• †Didymograptus nitidus – or unidentified comparable form
• †Dielasma
• †Dielasma formosum
• †Dielasma phosphoriense
• †Dielasma spatulatum
• †Dimegelasma
• †Dimeropygiella
• †Dimeropygiella blanda
• †Dimeropygiella caudanodosa – type locality for species
• †Dimeropygiella fillmorensis
• †Dimeropygiella mccormicki
• †Dimeropygiella ovata
• †Dimorphoceras
• †Dimorphoceras rileyi – type locality for species
• †Dimorphoceras worki – type locality for species
• †Dioxycaris
• †Dioxycaris argenta
• †Diparalasma
• †Diparelasma
• †Diparelasma pogonipensis – or unidentified comparable form
• †Diparelasma rowelli
• †Diparelasma transversum – or unidentified comparable form
• †Diphyphyllum
• †Diplagnostus
• †Diplagnostus planicauda
• †Diplorrhina
• †Diplorrhina depressa
• †Diplothmema
• †Diplothmema arnoldi
• †Diplothmema obtusiloba
• †Diplothmema trifoliolata
• †Diplotrypa – tentative report
• †Ditomopyge
• †Dolerorthis – tentative report
• †Dolerorthis flabellites
• †Donaldina
• †Dorypyge
• †Dorypyge swasii
• †Dorypyge wellsvillensis
• †Drepanodus
• †Drepanodus homocurvatus
• †Dresbachia
• †Dresbachia amata
• †Duartea
• †Duartea bruntoni
• †Dunbarinella – tentative report
• †Dunderbergia
• †Dunderbergia anyta
• †Dunderbergia bigranulosa – tentative report
• †Dyoros
• †Dyoros type locality for species A – informal
• †Dysoristus
• †Dytremacephalus
• †Dzhaprakoceras

{{Compact TOC}}

• †Echinalosia
• †Echinalosia type locality for species A – informal
• †Echinaria{{clarify|date=February 2018}}
• †Echinaria semipunctata – or unidentified related form
• †Echinauris – or unidentified comparable form
• †Echinauris subhorrida
• †Echinoconchus
• †Echinoconchus elegans
• †Echinoconchus semipunctatus
• †Echinocrinus
• †Ectenonotus
• †Ectenonotus progenitor
• †Ectenonotus whittingtoni
• File:Ectosteorhachis.JPG]] †Ectosteorhachis – or unidentified related form
• †Ectosteorhachis nitidus
• †Edmondia
• †Ehmaniella
• †Ehmaniella quadrans – tentative report
• †Ekvasophyllum
• †Ekvasophyllum inclinatum
• †Elburgia
• †Elburgia granulosa
• †Elburgia intermedia
• †Eldonia
• †Eldonia ludwigi
• †Eleutherocentrus
• †Eleutherocentrus petersoni
• †Elrathella
• File:Elrathia kingii growth series.jpg]] †Elrathia
• †Elrathia kingi
• †Elrathiella
• †Elrathiella dugwayensa – type locality for species
• †Elrathina
• †Elrathina spencei
• †Elvinia
• †Emeraldella
• †Endelocrinus
• †Endelocrinus matheri
• †Endoceras
• †Entogonites
• †Entogonites acus
• †Entogonites borealis
• †Entogonites burbankensis – type locality for species
• †Eoastarte
• †Eoastarte subcircularis
• †Eofletcheria
• †Eoorthis
• †Eriaster – type locality for genus
• †Eriaster ibexensis – type locality for species
• †Eridopora
• †Eridotrypa
• †Eridotrypa hindsi
• †Eridotrypa subtilis
• †Erixanium
• †Erixanium carinatum
• File:Eryops1DB.jpg]] †Eryops
• †Euconospira
• †Eukrinaster – type locality for genus
• †Eukrinaster ibexensis – type locality for species
• †Eukteanochiton – type locality for genus
• †Eukteanochiton milleri – type locality for species
• †Euloma – report made of unidentified related form or using admittedly obsolete nomenclature
• †Euloma cordilleri
• †Eumetria
• †Eumetria acuticosta
• †Eumetria costata
• †Euphemites
• †Euphemites carbonarius
• †Euphemitopsis
• †Euphemitopsis subpapillosa – type locality for species
• †Euptychaspis
• †Eurekia
• †Eurytreta
• †Eurytreta bisecta – or unidentified comparable form
• †Eurytreta fillmorensis – type locality for species

{{Compact TOC}}

• †Faberophyllum
• †Falcatamacaris – type locality for genus
• †Falcatamacaris bellua – type locality for species
• †Fenestella
• †Fenestella acarinata
• †Fenestella crockfordae
• †Fenestella dissepinodaria
• †Fenestella hamithensis
• †Fenestella incipiens
• †Fenestella parallela
• †Fenestella rarinodosa
• †Fenestella regalis
• †Fenestella serratula
• †Fenestella tooelensis
• †Fenestella trifurcata
• †Fenestella utahensis
• †Fenestralia
• †Fenestralia sanctiludovici
• †Fenestrellina
• †Fistulipora
• †Forteyops
• †Forteyops sexapugia – type locality for species
• †Fusulinella

{{Compact TOC}}

• †Gattendorfia
• †Genalaticurus
• †Genalaticurus genalatus
• File:Genevievella granulosa CRF.jpg]] †Genevievella
• †Genevievella granulatus
• †Girtyella – tentative report
• †Girtyoceras
• †Girtyoceras gordoni – type locality for species
• †Girtyoceras hamiltonense
• †Girtyoceras primum – type locality for species
• †Girtypecten
• †Girtyspira
• †Girvanella
• †Glabrocingulum
• †Glabrocingulum coronatum
• †Glabrocingulum granulosum – type locality for species
• †Glabrocingulum mephitifontis – type locality for species
• †Glaphyrites
• †Glaphyrites nevadensis
• †Globocrinus
• †Globocrinus bulbus – type locality for species
• †Glochinomorpha – type locality for genus
• †Glochinomorpha stifeli – type locality for species
• †Glosopleura
• †Glossopleura
• †Glossopleura boccar
• †Glossopleura gigantea
• †Glossopleura producta
• †Glossopleura prona
• †Glossopleura punctatum
• †Glyphaspis
• †Glyphaspis concavus – type locality for species
• †Glyptospira
• †Gnathodus
• †Gnathodus texanus
• †Gnetopsis
• †Gnetopsis anglica
• File:Gogia kitchnerensis 01.jpg]] †Gogia
• †Gogia granulosa
• †Gogia guntheri
• †Gogia kitchnerensis
• †Gogia spiralis
• †Goleocrinus
• †Goleocrinus vadosus – type locality for species
• †Goleocrinus vedosus
• †Goniasma
• †Goniatites
• †Goniatites americanus
• †Goniatites deceptus – type locality for species
• †Goniatites eganensis
• †Goniatites sowerbyi
• †Goniophrys
• †Goniophrys prima
• †Goniotelena
• †Goniotelena ensifer
• †Goniotelina
• †Goniotelina ensifer
• †Goniotelina plicolabeonus – type locality for species
• †Goniotelus – tentative report
• †Goniotelus ludificatus
• †Gonitelina
• †Gothodus
• †Gothodus communis
• †Grammatodon
• †Grammatodon politus
• †Grandaurispina – or unidentified comparable form
• †Grandaurispina type locality for species A – informal
• †Gruntia – tentative report
• †Guizhoupecten – tentative report
• †Guizhoupecten tubicostata – or unidentified comparable form
• †Gujocardita
• †Gujocardita parviradiatus – type locality for species
• †Gunterichthys – type locality for genus
• †Gunterichthys lehiensis – type locality for species

{{Compact TOC}}

• †Haimacystis
• †Haimacystis rozhnovi
• †Hammatocyclus
• †Hammatocyclus brazerensis – type locality for species
• †Hamptonia
• †Hamptonia bowerbanki
• †Hamptonia parva – type locality for species
• †Haplistion
• †Haplistion sphaericum
• File:Haplophrentis.jpg]] †Haplophrentis
• †Haplophrentis carinatus
• †Haplophrentis reesei
• †Hardyoides
• †Hazelia
• †Hazelia palmata
• †Heckethornia
• †Heckethornia alticapitis – type locality for species
• †Heckethornia ballionae – type locality for species
• †Heckethornia bowiei – type locality for species
• †Heckethornia hyndeae
• †Heckethornia morrisseyi – type locality for species
• †Heckethornia numani
• †Heckethornia smithi – type locality for species
• †Heintzella
• †Heintzella whitneyi
• File:Helicoprion bessonovi cropped.png]] †Helicoprion
• †Helicospira
• †Hematites
• †Hematites barbarae – type locality for species
• †Hematites burbankensis – type locality for species
• †Hemiptychina
• †Hemiptychina quadricostata
• †Hemirhodon
• †Hemirhodon amplipyge
• †Hemitrypa
• †Hemitrypa reticulata
• †Hesperonomia
• †Hesperonomia dinorthoides
• †Hesperonomia fontinalis
• †Hesperonomia frontinalis
• †Hesperonomiella
• †Hesperonomiella minor
• †Heteralosia
• †Heteropecten
• †Heteropecten vanvleeti – or unidentified comparable form
• †Hillyardina
• †Hillyardina marginauctum
• †Hillyardina semicylindrica – or unidentified comparable form
• †Hindia{{clarify|date=February 2018}}
• †Hindia sphaeroidalus
• †Hintzecurus
• †Hintzecurus paragenalatus
• †Hintzeia
• †Hintzeia aemula
• †Hintzeia celsaora
• †Hintzeia firmimarginis
• †Hintzespongia – type locality for genus
• †Hintzespongia bilamina – type locality for species
• †Holcospermum
• †Homagnostus
• †Homalophyllites
• †Hormotoma – tentative report
• †Housia
• †Howellella
• †Hudsonospongia – tentative report
• †Huronia
• †Huronia vertebralis
• †Hustedia
• †Hustedia elongata
• †Hustedia mormoni – type locality for species
• †Hyattidina – tentative report
• †Hyolithellus

File:Hyoliths02.JPG]] †Hyolithes

• †Hyolithes comptus
• †Hypagnostus
• †Hypagnostus parvifrons
• Hyperammina
• †Hyperbolochilus
• †Hypselocrinus
• †Hypselocrinus cavus – type locality for species
• †Hypselocrinus defendus – type locality for species
• †Hypselocrinus secundus
• †Hypselocrinus superus – type locality for species
• †Hystriculina
• †Hystriculina fragilis
• †Hystriculina wabashensis
• †Hystricurus
• †Hystricurus contractus
• †Hystricurus oculilunatus
• †Hystricurus robusta

{{Compact TOC}}

• †Ianthinopsis
• †Ibexella
• †Ibexella multidiaphragmata
• †Ibexicurus
• †Ibexicurus parsonsi – type locality for species
• †Iddingsia
• †Idiognathodus
• †Idiomesus
• †Illaenurus
• File:Illaenidae - Illaenus tauricornis.JPG]] †Illaenus
• †Illaenus utahensis
• †Inflatia
• †Inflatia bilobata
• †Iphidella
• †Irvingella{{clarify|date=February 2018}}
• †Irvingella flohri – tentative report
• †Irvingella major
• †Ischyrotoma
• †Ischyrotoma juabensis
• †Ischyrotoma wahwahensis
• †Isorthis
• †Isoteloides
• †Isoteloides flexus
• †Isoteloides polaris
• †Isoxyes

{{Compact TOC}}

• †Jeffersonia
• †Jenkinsonia
• †Jenkinsonia varga
• †Juresania
• †Juresania nebraskensis

{{Compact TOC}}

• †Kainella
• †Kanoshia
• †Kanoshia depressus – type locality for species
• †Kanoshia kanoshensis
• †Kanoshia reticulata
• †Kanoshopora
• †Kanoshopora droserae
• †Kawina
• †Kawina webbi
• †Kawina wilsoni
• †Kazakhoceras
• †Kazakhoceras bylundi – type locality for species
• †Kindbladia
• †Kindbladia affinis
• †Kingstonia
• †Kirkella{{clarify|date=February 2018}}
• †Kirkella fillmorensis
• †Kiwetinokia
• †Kiwetinokia utahensis
• †Kochina
• †Kochina vestita
• †Kochiproductus
• †Komia{{clarify|date=February 2018}}
• †Komiella
• †Komiella ostiolata
• File:Kootenia fossil cropped.png]] †Kootenia
• †Kootenia acicularis
• †Kootenia mendosa
• †Kootenia quadriceps
• †Kootenia spencei
• †Kootina
• †Kootina pectenoides
• †Kormagnostella
• †Kormagnostella advena
• †Kormagnostella insolita
• †Kormagnostus
• †Kozlowskia
• †Kozlowskia capaci – or unidentified related form
• †Kutorginella
• †Kutorginella lasallensis
• †Kuvelousia
• †Kuvelousia leptosa

{{Compact TOC}}

• †Lachnostoma
• †Lachnostoma latucelsum – type locality for species
• †Lagenospermum
• †Lagenospermum discissium – type locality for species
• †Lamellispira
• †Lavadamia
• †Lavadamia joplinae – type locality for species
• †Leanchoila
• †Leanchoila protogonia
• †Leanchoila superlata
• File:Leanchoilia superlata study cropped.png]] †Leanchoilia
• †Leanchoilia hanceyi
• †Leanchoilia superlata
• †Lecanospira
• †Leiorhynchoidea
• †Leiorhynchus
• †Leiostegium
• †Leiostegium formosa
• †Leiostegium manitouense – or unidentified comparable form
• †Leiostegium manitouensis
• †Lejopyge
• †Lejopyge calva
• †Leperditia
• †Leperditia bivia
• †Lepidocarpon
• †Lepidocarpon linearifolium
• File:Lepidodendron.png]] †Lepidodendron
• †Lepidodendron aculeatum
• †Lepidodendron obovatum
• †Lepidodendron volkmannianum
• †Lepidophylloides
• †Lepidophyllum
• †Lepidophyllum longifolium
• †Lepidostrobophyllum
• †Lepidostrobophyllum majus
• †Lepidostrobus
• †Lepidostrobus obovatus
• †Lepidostrobus variabilis
• †Leptaena
• †Leptalosia
• †Leptalosia scintilla – or unidentified comparable form
• †Leptanena
• †Leptomitella
• †Leptomitella metta – type locality for species
• †Leptomitus
• †Lesuerilla – tentative report
• †Licnocephala
• †Licnocephala bicornuta – tentative report
• †Licnocephala cavigladius
• Lima{{clarify|date=February 2018}}
• †Limapecten
• Limatula
• †Limipecten
• †Linevitus
• †Linevitus billingsi
• Lingula
• †Lingula carbonaria
• File:Lingulella caelata 1.png]] †Lingulella
• †Lingulella incurvata
• †Lingulella pogonipensis – or unidentified comparable form
• †Linipalus
• †Linipalus magnispinus
• †Linnarssonella
• †Linnarssonia
• †Linnarssonia bellatula
• †Linnarssonia ophirensis
• †Linoproductus
• †Linoproductus meniscus
• †Linoproductus ovatus
• †Linoproductus planiventralis – tentative report
• †Linoproductus prattenians
• †Linoproductus prattenianus
• †Lissocoelia
• †Lissocoelia cylindrica
• †Lithostrontionella
• †Lithostrotionella
• †Lithostrotionella americana – or unidentified comparable form
• †Llanoaspis
• †Lobatospongia – type locality for genus
• †Lobatospongia nodensis – type locality for species
• †Lochriea
• †Lochriea commutata
• †Lonchocephalus
• †Lophophyllidium
• †Lophophyllidium profundum
• †Loxonema
• †Loxoplocus
• †Lunulazona
• †Lunulazona costata
• †Lunulazona nodomarginata
• †Lyracystis
• †Lyracystis reesei

{{Compact TOC}}

• †Macluritella
• †Maclurites
• †Macronotella
• †Madaraspis
• †Madaraspis magnifica
• File:Margaretia dorus Reconstruction.png]] †Margaretia
• †Margaretia dorus
• †Marginifera
• †Marginovatia
• †Marginovatia catinulus
• †Mariopteris
• †Mariopteris muricata
• †Marjumicystis
• †Marjumicystis mettae – type locality for species
• †Marpolia
• †Matherella
• †Matthevia
• †Matthevia variabilis
• †Matthevia wahwahensis – type locality for species
• †Meekopora
• †Meekospira
• †Menomonia
• †Menomonia semele
• †Menoparia
• †Menoparia genalunata
• †Metabowmania
• †Metabowmania braggi – type locality for species
• †Metabowmania morgani
• File:Metacoceras discoideum 01.jpg]] †Metacoceras
• †Metadimorphoceras
• †Metadimorphoceras mangeri – type locality for species
• †Metadimorphoceras richardsi
• †Meteoaspis – tentative report
• †Meteoraspis
• †Michelinia
• †Microcardinalia
• †Micromitra
• †Micromitra pannula
• †Millardicurus
• †Millardicurus housensis – type locality for species
• †Millardicurus millardensis
• †Millardicurus paramillardensis – type locality for species
• †Modiolopsis
• Modiolus – report made of unidentified related form or using admittedly obsolete nomenclature
• †Modocia
• †Modocia brevispina
• †Modocia laevinucha
• †Modocia typicalis
• †Modocia weeksensis – type locality for species
• †Mollisonia
• †Mollisonia symmetrica
• †Morania
• †Morania fragmenta
• †Mourlonia
• †Mourlonia venusta – type locality for species
• †Myalina

{{Compact TOC}}

• †Nanorthis
• †Nanorthis hamburgensis
• †Nanorthis multicostata
• File:Naraoia spinosa.jpg]] †Naraoia
• †Naraoia compacta
• †Narynella
• †Narynella sulcata
• †Naticopis
• †Naticopis altonensis – tentative report
• †Naticopsis
• †Natiria
• †Neochonetes
• †Neochonetes granulifer
• †Neolenus
• †Neolenus inflatus – type locality for species
• †Neolenus intermedius – type locality for species
• †Neolenus superbus
• †Neoprioniodus
• †Neoprioniodus scitulus
• †Neoprioniodus varians
• File:Trigonotretidae - Neospirifer ravana.JPG]] †Neospirifer
• †Neospirifer cameratus
• †Neospirifer kansasensis
• †Neospirifer triplicatus
• †Neozaphrentis – tentative report
• †Nephalicephalus – type locality for genus
• †Nephalicephalus beebei – type locality for species
• †Nettapezoura
• †Nettapezoura basilika
• †Neuralethopteris
• †Neuralethopteris pocahontas – or unidentified comparable form
• File:Neuropteris PAMuseum.jpg]] †Neuropteris
• †Neuropteris ampelina – type locality for species
• †Neuropteris gigantea
• †Neuropteris heterophylla
• †Nieszkowskia – tentative report
• †Niobe{{clarify|date=February 2018}} – tentative report
• †Nisusia
• †Norwoodia
• †Norwoodia bellaspina
• †Nothorthis
• †Nuculavus
• †Nuculopsis
• †Nuia
• †Nunnacrinus
• †Nunnacrinus olsoni – type locality for species

{{Compact TOC}}

• †Obolus{{clarify|date=February 2018}}
• †Obolus ella
• †Odontopteris
• †Odontopteris osmundaeformis – or unidentified comparable form
• †Odontopteris subcrenulata – or unidentified comparable form
• †Odontospirifer
• †Odontospirifer type locality for species A – informal
• †Oepikodus
• †Oepikodus quadratus
• File:Ogygopsis Klotzi cropped.jpg]] †Ogygopsis
• †Ogygopsis typicalis
• †Oistodus
• †Oistodus lanceolatus
• †Oistodus linguatus
• †Oistodus longiramis
• †Oistodus multicorrugatus – or unidentified related form
• †Oistodus parallelus
• †Olenellus
• †Olenellus gilberti
• †Olenoides
• †Olenoides expansus
• †Olenoides nevadensis
• †Olenoides serratus
• †Olenoides spencei
• †Olenoides tricephalus
• File:Ophiacodon mirus cropped.png]] †Ophiacodon
• †Ophiacodon navajovicus
• †Ophileta
• †Opsioryctocephalus
• †Opsioryctocephalus opsis
• †Orbiculoidea
• †Orbiculoidea capuliformis
• †Orbiculoidea missouriensis
• †Orbiculoidea utahensis – type locality for species
• †Orbipora
• †Orbipora utahensis
• †Orthambonites
• †Orthambonites eucharis – or unidentified comparable form
• †Orthambonites michaelis
• †Orthambonites subulata
• †Orthis
• †Orthis subalata – or unidentified comparable form
• †Orthis subulata
• †Orthis swanensis
• †Orthonema
• †Orthonema socorroense – or unidentified comparable form
• †Orthotetes
• †Orthotetes kaskaskiensis
• †Orthriochiton – type locality for genus
• †Orthriochiton utahensis – type locality for species
• †Oryctocare
• †Oryctocare geikei
• †Oryctocephalus
• †Oryctocephalus walcotti
• †Ottenbyella
• †Ottenbyella ibexiana – type locality for species
• File:Ottoia burrowing cropped.png]] †Ottoia
• †Ottoia prolifica
• †Ovatia
• †Ovatia muralis
• †Owenella
• †Ozarkodina

{{Compact TOC}}

• †Pachycranium
• †Pachycranium faciclunis
• File:Pagetia taijiangensis 2.jpg]] †Pagetia
• †Pagetia fossula – or unidentified comparable form
• †Paladin
• †Palaeacis
• Palaeoaplysina
• †Palaeoaplysina laminaeformis
• †Palaeobotryllus
• †Palaeoneilo
• †Palaeoneilo parvaradiatus
• †Palaeoscolex
• †Palaeoscolex ratcliffei
• †Paleococrinus
• †Palmerocrinus
• †Palmerocrinus profundus
• †Paltodus
• †Paltodus jeffersonensis
• †Parabellefontia
• †Parabellefontia concinna
• †Parabolinoides
• †Paracosmetocrinus
• †Paracosmetocrinus lundi – type locality for species
• †Parahystricurus
• †Parahystricurus bispicatus
• †Parahystricurus fraudator
• †Parajuresania
• †Parajuresania nebrascensis
• †Parallelodon
• †Parapilekia – tentative report
• †Paraplethopeltis
• †Paraplethopeltis genacurvus
• †Paraplethopeltis genarectus
• †Parkaspis
• †Parkaspis drumensis
• †Peelerophon – tentative report
• †Pelagiella
• †Peniculauris
• †Peniculauris bassi
• †Peniculauris ivesi
• †Penniretepora
• †Pentameroides
• †Pentamerus
• †Pericyclus
• †Permophorus
• †Permophorus albequus
• †Permophorus occidentalis
• File:Itagnostus interstrictus - Wheeler Schale, Utah, USA - Cambrian period (≈ -507 MA) - 39.25°N 113.33°W .jpg, until recently known as Peronopsis interstricta]] †Peronopsis
• †Peronopsis acadica
• †Peronopsis amplaxis
• †Peronopsis bonnerensis
• †Peronopsis brighamensis
• †Peronopsis fallax
• †Peronopsis interstricata
• †Peronopsis interstricta
• †Peronopsis montis
• †Peronopsis scutalis
• †Peronopsis segmenta
• †Peronopsis sermenta
• †Perspicaris
• †Perspicaris ellipsopelta
• †Petasmatherus
• †Petasmatherus type locality for species A – informal
• †Petigurus
• †Petigurus inexpectatus
• †Pharkidonotus
• †Pharkidonotus percarinatus
• †Phillipsia
• †Phosphannulus
• †Phrenophoria
• †Phrenophoria type locality for species A – informal
• †Phricodothyris
• †Phyllograptus
• †Pilekia
• †Pilekia trio – tentative report
• Pinna – report made of unidentified related form or using admittedly obsolete nomenclature
• †Plagioglypta
• †Platycrinites
• †Platycrinus
• †Platycrinus graphicus – or unidentified comparable form
• File:Platyhystrix BW.jpg]] †Platyhystrix – or unidentified comparable form
• †Platyhystrix rugosus
• †Platyworthenia
• †Plectelasma
• †Plectelasma type locality for species A – informal
• †Plectelasma type locality for species B – informal
• †Plethospira
• †Pleurosiphonella
• †Pleurosiphonella virginica
• †Pliomerops
• †Pliomerops insolita
• †Polidevcia
• †Polidevcia bellistriata
• †Polidevcia obesa
• †Politicurus
• †Politicurus politus
• †Polypora
• †Polypora cestriensis
• †Polypora debilis
• †Polypora micronodosa
• †Polypora stansburyensis
• †Ponticulocarpus – type locality for genus
• †Ponticulocarpus robisoni – type locality for species
• †Praedaraelites
• †Praedaraelites loeblichi
• †Prehousia
• †Prehousia alata
• †Prehousia diverta
• †Presbynileus
• †Presbynileus elongatus
• †Presbynileus ibexensis
• †Presbynileus utahensis
• †Probolionia
• †Prodentalium
• †Prodentalium canna
• †Productella
• †Productus – report made of unidentified related form or using admittedly obsolete nomenclature
• †Proehmaniella
• †Proehmaniella basilica
• †Prohedinia
• †Prohedinia spencei
• †Prolecanites – tentative report
• †Prolecanites lyoni
• †Prosaukia
• †Protoblechnum
• †Protoblechnum bradyi – type locality for species
• †Protopliomerella
• †Protopliomerella contracta
• †Protopliomerops
• †Protopliomerops quattuor – type locality for species
• †Protopresbynileus
• †Protopresbynileus willdeni
• †Protoretepora
• †Protospongia
• †Protospongia elongata
• †Prototreta
• †Protowentzelella
• †Protowentzelella cystosa
• †Psalikilus
• †Psalikilus likum
• †Psalikilus paraspinosum
• †Psalikilus spinosum
• †Psalikilus typicum
• †Psephosthenaspis
• †Psephosthenaspis glabrior
• †Psephosthenaspis microspinosa
• †Psephosthenaspis pseudobathyurus
• †Pseudagnostus
• †Pseudoarctolepis
• †Pseudoarctolepis sharpi
• †Pseudoarctolepsis
• †Pseudoarctolepsis sharpi
• †Pseudoclelandia
• †Pseudoclelandia fluxafissura – or unidentified related form
• †Pseudocybele
• †Pseudocybele altinasuta
• †Pseudocybele lemurei
• †Pseudocybele nasuta – type locality for species
• †Pseudodoriodotis
• †Pseudohystricurus
• †Pseudokainella – tentative report
• †Pseudokainella armatus
• †Pseudomera
• †Pseudomera arachnopyge
• †Pseudomera barrandei – or unidentified comparable form
• †Pseudomera insolita
• †Pseudomonotis
• †Pseudomonotis equistriata
• †Pseudomphalotrochus
• †Pseudomphalotrochus incrustatus
• †Pseudoolenoides
• †Pseudoolenoides acicaudus
• †Pseudoolenoides aspinosus
• †Pseudoolenoides dilectus
• †Pseudopermophorus
• †Pseudopermophorus annettae
• †Pseudoperonopsis
• †Pseudorthoceras
• †Pseudosaratogia – tentative report
• †Pseudoschwagerina
• †Pterocephalia
• †Pteronites
• †Ptychagnostus
• †Ptychagnostus aculeatus
• File:Ptychagnostus Atavus.jpg]] †Ptychagnostus atavus
• †Ptychagnostus cassis
• †Ptychagnostus germanus
• †Ptychagnostus intermedius
• †Ptychagnostus occultatus
• †Ptychagnostus punctuosus
• †Ptychagnostus richmondensis
• †Ptychagnostus seminula
• †Ptychomphalus
• †Ptychoparella
• †Ptylopora
• †Ptylopora condrai
• †Ptylopora eliasi
• †Ptyocephalus
• †Ptyocephalus accliva
• †Ptyocephalus declevita – type locality for species
• †Ptyocephalus declivita
• †Ptyocephalus versini
• †Ptyocephalus vigilans
• †Pugnax{{clarify|date=February 2018}}
• †Pugnax utah – type locality for species
• †Pugnoides
• †Punctospirifer
• †Punctospirifer campestris
• †Punctospirifer kentuckensis
• †Punka{{clarify|date=February 2018}}
• †Punka nitida – or unidentified comparable form

{{Compact TOC}}

• †Quadratia
• †Quadrisonia – tentative report
• †Quadrisonia lavadamensis
• †Quadrochonetes
• †Quadrochonetes type locality for species A – informal

{{Compact TOC}}

• †Ramiporalia
• †Raphistoma – tentative report
• †Raphistomina
• †Ratcliffespongia – type locality for genus
• †Ratcliffespongia perforata – type locality for species
• †Ratcliffespongia sheeleri
• †Ratcliffespongia wheeleri – type locality for species
• †Rayonnoceras
• †Rayonnoceras solidiorme
• File:KimmswickOzoraMidOrdReceptaculitid.jpg]] †Receptaculites
• †Receptaculites elongatus
• †Receptaculites mammilaris
• †Receptaculites mammillaris
• †Rectifenestella
• †Rectifenestella tenax
• †Regispongia
• †Regispongia contorta
• †Remopleuridiella
• †Remopleuridiella angularis – type locality for species
• †Remopleuridiella caudalimbata
• †Reticulatia
• †Reticulatia americana
• †Retispira
• †Retispira cincta – type locality for species
• †Retispira textilis – or unidentified comparable form
• †Rhabdomeson
• †Rhabdomeson artum
• †Rhipidomella
• †Rhipidomella missouriensis
• File:Naturalis Biodiversity Center - ZMA.MOLL.32565 - Rhodea maxima Mousson - Subulinidae - Mollusc shell cropped.jpg land snail]] †Rhodea
• †Rhodea vespertina
• †Rhombopora
• †Rhombopora tenuirama
• †Rhynchopora
• †Ribeiria
• †Ribeiria lucan
• †Rigbyocarpus – type locality for genus
• †Rigbyocarpus ebracteatus – type locality for species
• †Rodea
• †Rodea vespertina – or unidentified comparable form
• †Rossaspis
• †Rossaspis superciliosa
• †Rossicurus
• †Rossicurus lepidus
• †Rugatia
• †Rugatia occidentalis
• †Rugosochonetes
• †Rugosochonetes loganensis
• File:RusophycusOrdovician.jpg]] †Rusophycus
• †Rylstonia – tentative report

{{Compact TOC}}

• †Saffordotaxis
• †Sanguinolites
• †Sanguinolites elongatus – type locality for species
• †Saukia
• File:Saukiidae - Saukiella pepinensis.JPG]] †Saukiella
• †Scandodus
• †Scandodus furnishi
• †Scaphellina – tentative report
• †Scenella
• †Scenella radians
• †Schizambon
• †Schizambon obtusus – type locality for species
• †Schizodus
• †Schizodus bifidus
• †Schizodus subovatus – type locality for species
• †Schizophoria
• †Schmalenseeia
• †Schuchertella
• †Schuchertella lens
• †Schwagerina
• †Scolicia
• †Scolopodus
• †Scolopodus gracilis
• †Scolopodus pseudoquadratus
• †Scolopodus quadraplicatus
• †Scolopodus rex
• †Seelyia
• †Selenocoryphe – type locality for genus
• †Selenocoryphe platyura – type locality for species
• File:Selkirkia columbia ROM63131.jpg]] †Selkirkia
• †Selkirkia columbia – or unidentified comparable form
• †Selkirkia spencei
• †Selkirkia willoughby
• †Sentinelia – tentative report
• †Sentinelia draco – or unidentified comparable form
• †Septimyalina
• †Septimyalina burmai – tentative report
• †Septopora
• †Septopora ulrichi
• †Shoshonorthis
• †Shoshonorthis michaelis
• †Shoshonorthis swanensis
• †Shumardia
• †Shumardia exopthalmus
• File:Sidneyia1.JPG]] †Sidneyia
• †Sigillaria
• †Sigillaria brardii
• †Sinuella – tentative report
• †Siphonobolus – tentative report
• †Spathognathus
• †Spathognathus cristulus
• †Spathognathus scitulus
• †Spencella
• †Spencella utahensa – type locality for species
• †Spencella utahensis
• File:Sphenacodon2.jpg]] Sphenacodon
• †Sphenacodon ferocior – or unidentified comparable form
• †Sphenophyllostachys – tentative report
• †Sphenophyllum
• †Sphenophyllum angustifolium
• †Sphenophyllum verticillatum
• †Sphenopteridium
• †Sphenopteridium dissectum
• †Sphenopteridium zaitzeffii – type locality for species
• †Sphenopteris
• †Sphenopteris diphlebia – type locality for species
• †Sphenosteges
• †Sphenosteges hispidus
• †Spinilingula
• †Spinilingula prisca – type locality for species
• †Spinofacia – type locality for genus
• †Spinofacia pectinatus – type locality for species
• File:Spirifer perlamosus pedunculate valve.jpg]] †Spirifer
• †Spirifer centronatus
• †Spirifer opimus
• †Spirifer rockymountanus
• †Spiriferina
• †Spirinella
• †Spirinella pauciplicata
• Spirorbis
• †Squamaria
• †Squamularia – report made of unidentified related form or using admittedly obsolete nomenclature
• †Stenolobulites
• †Stenolobulites simulator
• †Stenolobulites sinuosus
• †Stenopora
• †Stenopora confusionensis
• †Stenoporella
• †Stenoporella mineriensis
• †Stenorhachis – tentative report
• †Stenorhachis genalticurvatus
• †Stibaraster – type locality for genus
• †Stibaraster ratcliffei – type locality for species
• File:Lycopsid joggins mcr1.JPG rhizome system]] †Stigmaria
• †Stigmaria ficoides
• †Stigmariopsis
• †Stigmariopsis anglica
• †Stolodus – or unidentified related form
• †Stolodus stola
• †Straparollus
• †Streblochondria
• †Strebloplax
• †Strebloplax pertusa
• †Streblopteria
• †Streblopteria montpelierensis
• †Streblotrypa
• †Streblotrypa angulatum
• †Streptelasma
• †Striatifera
• †Striatifera brazeriana
• †Strigambitus
• †Strigambitus utahensis
• †Strobeus – or unidentified related form
• †Sulcoretepora
• †Supaia
• †Supaia rigida
• †Symphysurina
• †Symphysurina cleora – or unidentified comparable form
• †Symphysurina globocapitella
• †Symphysurina illaenoides
• †Symphysurina spicata – or unidentified comparable form
• †Symphysurina uncaspicata
• †Symphysurina walcotti
• †Symphysurus – tentative report
• †Synarmocrinus
• †Synarmocrinus depressus – type locality for species
• †Syntrophina
• †Syntrophina campbelli – or unidentified comparable form
• †Syntrophina carinifera
• †Syntrophopsis
• †Syntrophopsis polita
• †Syntrophopsis transversa
• File:Syringoporid.jpg]] †Syringopora
• †Syringopora aculeata
• †Syringopora surcularia
• †Syringothyris
• †Syringothyris textus

{{Compact TOC}}

• †Tabulipora
• †Tabulipora atacta
• †Tabulipora carbonaria
• †Tabulipora ricta
• †Tabulipora sarcinula
• †Tabulipora stragula
• †Taeniopteris
• †Talpaspongia
• †Talpaspongia clavata
• File:Teichichnus burrows.jpg]] †Teichichnus – tentative report
• †Telangium
• †Telangium affine
• †Terranovella
• †Tesselacauda
• †Tesselacauda depressa – or unidentified comparable form
• †Testiispongia – type locality for genus
• †Testiispongia venula – type locality for species
• †Testispongia
• †Testispongia venula
• †Tetragraptus
• †Tetragraptus quadribrachiatus – or unidentified comparable form
• File:ThalassinoidesIsrael.JPG]] †Thalassinoides – tentative report
• †Thamniscus
• †Thamniscus raribifurcatus
• †Thamnosia – or unidentified comparable form
• †Thamnosia arctica – tentative report
• †Timania
• †Timaniella
• †Timaniella pseudocamerata
• †Tingia
• †Tingia placida – type locality for species
• †Tomagnostella
• †Tomagnostella exsculpta
• †Tonkinella
• †Tonkinella breviceps
• †Tonkinella valida
• †Torynifer
• †Totiglobus – tentative report
• †Totiglobus lloydi
• †Trace
• †Trace fossil
• †Trachycheilus
• †Trachycheilus granulosus
• †Trachycheilus whirlwindensis
• †Trematorthis – tentative report
• †Tricitictes
• †Tricrepicephalus
• †Tricrepicephalus teres
• †Trigonocarpus
• †Trigonocarpus noeggerathii
• †Trigonocerca
• †Trigonocerca typica
• †Trigonocercella
• †Trigonocercella acuta
• File:Arthrorhachis tarda draw entite.png]] †Trinodus
• †Triplagnostus
• †Triplagnostus gibbus
• †Triplophylites
• †Triplophylites compressus
• †Triplophylites ellipticus
• †Triplophylites subcrassus
• †Triticites
• †Tritoechia
• †Tritoechia loganensis
• †Tritoechia sinuata
• †Trocholites
• †Trochophyllum – tentative report
• †Trymataspis
• †Trymataspis depressa
• File:Tseajaia BW.jpg]] †Tseajaia
• †Tseajaia campi – type locality for species
• †Tulepyge
• †Tulepyge tulensis – type locality for species
• †Tumicephalus
• †Tumicephalus depressus
• †Tuzoia
• †Tuzoia argenta
• †Tuzoia guntheri
• †Tuzoia retifera
• †Tympanuella
• †Tympanuella transversa

{{Compact TOC}}

• †Ufimia
• †Ulrichodina – tentative report
• †Uromystrum
• †Uromystrum validum – or unidentified comparable form
• †Utagnostus
• †Utagnostus trispinulus
• †Utahacanthus – type locality for genus
• †Utahacanthus guntheri – type locality for species
• †Utahcaris
• †Utahcaris orion
• File:Utaherpeton.jpg]] †Utaherpeton – type locality for genus
• †Utaherpeton franklini – type locality for species
• †Utaspis
• †Utaspis marjumensis

{{Compact TOC}}

• †Valospongia
• †Valospongia gigantis – type locality for species
• †Valospongia gigantus
• File:VauxiaBurgess.jpg]] †Vauxia
• †Vauxia bellula
• †Vauxia gracilenta
• †Vauxia magna – type locality for species
• †Verkhotomia
• †Verkhotomia plenoides – or unidentified comparable form
• †Vesiculophyllum
• †Virgiana
• †Virgiana utahensis – type locality for species
• †Vnigripecten
• †Vnigripecten phosphaticus – or unidentified comparable form
• †Vorticina
• †Vorticina vortex – type locality for species

{{Compact TOC}}

• †Waagenites
• †Waagenites type locality for species A – informal
• †Waagenoconcha
• †Wahwahlingula
• †Wahwahlingula sevierensis – type locality for species
• †Walcottoceras – tentative report
• †Walcottoceras monsense
• File:Waptia fieldensis Restoration cropped.jpg]] †Waptia
• †Waptia fieldensis – or unidentified comparable form
• †Warthia – tentative report
• †Weeksina
• †Weeksina unispina
• †Wellerella
• †Wellerella osagensis
• †Wellerella tetrahedra
• †Wewokella
• †Wewokella solida
• †Wilkingia
• †Wimanella
• File:Wiwaxia corrugata cropped.png]] †Wiwaxia
• †Wiwaxia corrugata
• †Worthenia

{{Compact TOC}}

• File:Xenacanthus NT small cropped.png]] †Xenacanthus – or unidentified related form
• †Xenacanthus texensis
• †Xenostegium
• †Xenostegium acuminferentis – or unidentified comparable form
• †Xenostegium franklinense
• †Xestotrema
• †Xestotrema pulchrum
• †Xystocrania – tentative report
• †Xystocrania perforator

{{Compact TOC}}

• †Yakia – tentative report
• †Yakovlevia
• †Yakovlevia multistriata
• †Yuknessaspis
• †Yuknessaspis benningtonis – type locality for species
• †Yuknessia
• †Yuknessia simplex
• †Yunnania

{{Compact TOC}}

• †Zacanthoides
• †Zacanthoides divergens
• †Zacanthoides divergensis
• †Zacanthoides fronslicinus
• †Zacanthoides grabaui
• †Zacanthoides idahoensis
• †Zacanthoides prolixis
• †Zaphrentites
• †Zhanatella
• †Zhanatella utahensis
• †Zittelella
• †Zittelella clarae – or unidentified comparable form
• †Zittelloceras

• {{cite web |title=Fossilworks: Gateway to the Paleobiology Database |author=((Various Contributors to the Paleobiology Database)) |url=https://www.fossilworks.org |access-date=17 December 2021}}

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