List of the Paleozoic life of Iowa

{{Compact TOC}}

• †Abatocrinus
• †Acidaspis
• †Aclisina
• File:Monobathrida - Actinocrinites.JPG]] †Actinocrinites
• †Actinocrinites gibsoni
• †Actinocrinites jugosus
• †Actinocrinites lowei
• †Actinocrinites pernodosus
• †Actinocrinites probolos
• †Actinopteria – tentative report
• †Actinostroma
• †Actinostroma clathratum
• †Acutatheca
• †Acutatheca propira
• †Adocetocystis
• †Adolfia
• †Aechmina
• †Aechmina cuspidata
• †Aechmina ionensis
• †Aechmina maquiketensis
• †Aechmina taurea
• †Agassizodus
• †Agassizodus variabilis
• †Agelacrinites
• †Aglaocrinus
• †Aglaocrinus compactus
• †Allanella
• †Allanella allani
• †Allanella annae
• †Allanella cardinalis
• †Allenella
• †Allenella allani
• †Allenella annae
• †Allocrinus
• †Allocrinus ornatus
• †Allocrinus subglobosus
• †Allorhynchus
• †Allorhynchus currei – or unidentified comparable form
• †Allozygocrinus
• †Allozygocrinus dubuquensis
• †Alveolites
• †Ambocoelia
• †Ambocoelia louisianaensis
• †Ambocoelia minuta
• †Ambonychia
• †Americoncha
• †Americoncha marginata
• †Amphicoelia
• †Amphicyrtoceras
• †Amphipora
• †Amphipora pervesiculata
• †Amplexus
• †Anartiocystis
• †Anastrophia
• †Anataphrus
• †Anematina
• †Anematina conica
• †Angyomphalus
• †Angyomphalus lens
• †Angyomphalus penelenticulata – type locality for species
• †Anisotrypa
• †Anomphalus
• †Anthracospirifer
• †Anthracospirifer pellaensis
• †Antiquatonia
• †Antirhynchonella
• †Antirotella
• †Antirotella kindlei – type locality for species
• †Aorocrinus
• †Aparchites
• †Aparchites barbatus
• †Aparchites carinatus
• †Aparchites chatfieldensis
• †Aparchites ellipticus
• †Aparchites fimbriatus
• †Aparchites macrus
• †Aparchites paratumida
• †Aphelecrinus
• †Apycnodiscus
• †Arabellites
• †Arachnophyllum
• †Archaeocalyptocrininus
• †Archaeocalyptocrininus iowensis
• †Archaeocalyptocrininus nodosus
• †Archaeocalyptocrinus
• †Archaeocalyptocrinus iowensis
• †Archaeocalyptocrinus nodosus
• †Archaeocrinus
• †Archaeocrinus obconicus
• †Archaeogastropod
• †Archinacella
• †Archinacella rotunda
• File:Arctinurus boltoni.jpg]] †Arctinurus
• †Arctomeristina
• †Arisaigia
• †Arrectocrinus
• †Arrectocrinus iowensis
• †Arthroxylon
• †Asphaltinella
• †Asterophyllites
• †Asterophyllites multifolia
• †Asthenophyllum
• †Astraeospongium
• †Astreptodictya
• †Astrocystites
• †Astrocystites ottawaensis – tentative report
• †Atelodictyon
• †Atelodictyon masoncityense – type locality for species
• †Athyris
• †Athyris cedarensis
• †Athyris crassicardinalis
• †Athyris fultonensis – or unidentified comparable form
• †Athyris simplex
• †Athyris spiriferiodes
• †Athyris vitatta
• †Athyris vittata
• †Athyris zonulata
• †Atribonium
• †Atribonium nora
• †Atribonium paupera
• †Atribonium prolifica
• †Atribonium subovata
• †Atribonium swallovi
• †Atrypa
• File:Atrypa reticularis pedunculate Gondelsheim CRF.jpg]] †Atrypa reticularis
• †Atrypa reticularus
• †Atryparia
• †Atryparia varicostata
• †Atrypoidea
• †Aulacella
• †Aulocopella
• †Aulocopella dactylos – type locality for species
• †Aulocopella probolos – type locality for species
• †Aulocopella scelidos – type locality for species
• †Aviculopecten
• †Aviculopecten marbuti – or unidentified comparable form

{{Compact TOC}}

• Bairdia
• †Bairdiocypris
• †Bairdiocypris granti
• †Bairdocypris
• †Bairdocypris granti
• †Basseleratia
• †Basseleratia typa
• †Bassleratia
• †Bassleratia typa
• †Batostomella
• †Baylea
• †Baylea trifibra – type locality for species
• †Beecheria
• †Beecheria chouteauensis
• †Belemnocrinus
• File:Bellerophon umbilicalis.jpg]] †Bellerophon
• †Bellerophon blairi
• †Bellerophon panneus
• †Bellerophon patersoni
• †Bellerophon vinculatus
• †Bellornatia
• †Bellornatia tricollis
• †Belodina
• †Belodina compressa
• †Beloitoceras – tentative report
• †Beloitoceras discrepana
• †Bembexia
• †Bembexia minima
• †Bensbergia
• †Bensbergia pulchra – type locality for species
• †Beyrichia
• †Beyrichia irregularis
• †Bighornia
• †Blothrocrinus
• †Bobbodus
• †Bobbodus schaefferi
• †Bolicrinus
• †Bolicrinus deflatus
• †Bolicrinus globosus
• †Bollia
• †Bollia regularis
• †Bollia ruthae
• †Bollia subaequata
• File:Britannica Echinoderma 5.jpg. The short spines which were attached to the tubercles are not drawn.]] †Bothriocidaris
• †Bothriocidaris maquoketensis
• †Botryocrinus
• †Botryocrinus thomasi – type locality for species
• †Brachythyris
• †Brachythyris burlingtonensis – or unidentified comparable form
• †Brachythyris chouteauensis
• †Brachythyris peculiaris
• †Brachytomaria
• †Brachytomaria semele
• †Breviphillipsia
• †Brockocystis
• †Brockocystis nodosaria
• †Bromidella
• †Bromidella depressa
• †Bromidella rhomboides
• †Bryantodina
• †Bryantodina typicalis
• †Bucanella
• †Bucanella conradi
• †Bucanopsis
• †Bucanopsis lirata
• †Bullatekka
• †Bullatekka granilabiatus
• †Bullatella
• †Bullatella granilabiatus
• File:Trilobite - Bumastus reconstruction 3d.jpg]] †Bumastus
• †Buranella
• †Buxtonia – tentative report
• †Byrsolopsina
• †Byrsolopsina centipunctata
• †Byrsolopsina normella
• †Byrsolopsina ovata
• †Byrsolopsina planilateralis
• Bythocypris
• †Bythocypris curta
• †Bythocypris furnishi

{{Compact TOC}}

• †Caenanoplia
• †Caenanoplia logani
• †Calamocarpon
• †Calamocarpon insignis
• †Calceocrinus
• †Calceocrinus levorsoni
• †Calcisphaera
• †Calcisphaera laevis
• †Calliocrinus
• †Calliocrinus longispinus
• †Callocrinus
• †Callocrinus longispinus
• †Callocystites
• †Calvinaria
• †Calvinaria ambigua
• †Calvinaria bransoni
• †Calvustrigis – tentative report
• File:Calymene clavicula dorsal.jpg]] †Calymene
• †Camarophorella
• †Camarophorella lenticularis
• †Camarotoechia
• †Camarotoechia chemungensis
• †Camarotoechia chouteauensis
• †Camarotoechia crassiplicata
• †Camarotoechia perplexa
• †Camarotoechia quadricostatum
• †Camarotoechia saxatilis
• †Camarotoechia saxatillis
• †Camarotoechia tuta
• †Camerella
• †Carabocrinus
• †Carabocrinus radiatus
• †Carabocrinus slocomi
• †Cardiola
• †Cardiola lyoni
• †Carinatrypa
• †Carinatrypa dysmorphstrota
• †Cariniferella
• †Cariniferella iowensis
• †Carpocrinus
• †Carpocrinus bodei
• †Caryocrinites
• File:Museum Mensch und Natur - catenipora.jpg]] †Catenipora
• †Ceratocephala
• †Ceratopsis
• †Ceratopsis humilinoda
• †Ceratopsis quadrifida
• †Ceratopsis trilobis
• †Ceraurus
• †Cerithioides
• †Cerithioides judiae
• †Characterophyllum
• †Characterophyllum nanum
• †Charactoceras
• †Charactophyllum
• †Charactophyllum nanum
• †Charionella
• †Charionella nortoni
• File:Trilobite Ordovicien 8127.jpg]] †Cheirurus
• †Chomatodus
• †Chomatodus inconstans
• †Chonetes
• †Chonetes glenparkensis
• †Chonetes illinoisensis
• †Chonetes logani
• †Chonetes multicosta
• †Chonetes multicostata
• †Chonetes ornatus
• †Chonetina
• †Chonetinella
• †Chonetipustula
• †Chonetipustula concentrica
• †Chonopectus
• †Chonopectus fischeri
• †Chonophyllum
• †Clathrocoilona
• †Clathrocoilona involuta – type locality for species
• †Clathrodictyon
• †Cleiocrinus
• †Cleiocrinus regius
• †Cleiothyridina
• †Cleiothyridina crassicardinalis – or unidentified related form
• †Cleiothyridina glenparkensis – or unidentified comparable form
• †Cleiothyridina incrassata – or unidentified comparable form
• †Cleiothyridina sublamellosa
• †Climacoconus
• †Climacoconus pumilus
• File:Climacograptus wilsoni Graptolite Fossils from Dob%27s Linn Scotland.jpg]] †Climacograptus
• †Climacograptus pumilis
• †Climacograptus typicalis
• †Clinolithes
• †Clinopistha
• †Clintonella – tentative report
• †Clorinda
• †Cochliodus
• †Cochliodus occidentalis
• †Coelospira
• †Coeloterorhynchus
• †Coeloterorhynchus schucherti
• †Coeloterorhynchus subacuminata
• †Coeloterorhynchus subacuminatus
• †Coenites
• †Composita
• †Composita humilis – tentative report
• †Composita immatura – or unidentified comparable form
• †Composita trinuclea
• †Compsocrinus
• †Concavicaris
• †Concavicaris sinuata – or unidentified comparable form
• †Conocardium
• †Conotreta
• †Conularia
• †Coolinia
• File:Cornulites cellulosus.jpg]] †Cornulites
• †Costistricklandia
• †Costistricklandia castellana
• †Costistricklandia multilirata
• †Cotylacrina
• †Cotylacrina sandra
• †Cranaena
• †Cranaena amana
• †Cranaena arcuosa
• †Cranaena calvini
• †Cranaena depressa
• †Cranaena elia
• †Cranaena famelica
• †Cranaena inflata
• †Cranaena infrequens
• †Cranaena iowensis
• †Cranaena jacunda
• †Cranaena lata
• †Cranaena littleonensis
• †Cranaena littletonensis
• †Cranaena maculata
• †Cranaena marsii
• †Cranaena micula
• †Cranaena navicella
• †Cranaena occidentalis
• †Cranaena pachytesta
• †Cranaena parvirostra
• †Cranaena rhomboidialis
• †Cranaena rockfordensis
• †Cranaena romingeri
• †Cranaena seminula
• †Cranaena subcylindrica
• †Cranaena subglobosa
• †Cranaena subglossa
• †Cranaena subgobulosa
• †Cranaena subouata
• †Cranaena subovata
• †Cranaena thomasi
• †Cranaenella
• †Crania
• †Crania famelica
• †Crassiproetus
• †Crassiproetus arietinus
• †Crassiproetus bumastoides
• †Crassiproetus occidens
• †Crassiproetus searighti
• †Cremacrinus
• †Cremacrinus gerki
• †Cremacrinus guttenbergensis
• †Cremacrinus punctatus – or unidentified related form
• †Cremacrinus type locality for species – informal
• †Cribanocrinus
• †Crotalocrinintes
• File:Crinoidea - Crotalocrinites sp. .JPG]] †Crotalocrinites
• †Crurithyris
• †Cryptophyllus
• †Cryptophyllus oboloides
• †Cryptophyllus sulcatus
• †Ctenobolbina
• †Ctenobolbina emaciata
• †Ctenobolbina maquoketensis
• †Ctenodonta
• †Ctenodonta anatina
• †Ctenodonta calvini
• †Cupularostrum
• †Cupularostrum contracta
• †Cupularostrum saxatilis
• †Cupularostrum saxatillis
• †Cupulocorona
• †Cupulocrinus
• †Cupulocrinus angustatus
• †Cupulocrinus conjugans – or unidentified related form
• †Cupulocrinus crossmani
• †Cupulocrinus latibrachiatus – or unidentified related form
• †Curtognathus
• †Cusacrinus
• †Cyathaxonia
• †Cyathaxonia arcuatus
• File:Cyathocrinites multibrachiatus fossil crinoid (Mississippian; Crawfordsville, Indiana, USA) 2 (17385978065).jpg]] †Cyathocrinites
• †Cyathocrintes
• †Cyathocrintes striatissimus – or unidentified comparable form
• †Cyathophyllum
• †Cyclocrinites
• †Cyclocrinites dactilioides
• †Cyclocrinites dactioloides
• †Cyclocystoides
• †Cyclonema
• †Cyclonema bilix
• †Cyclonema minuta
• †Cyclora
• †Cynopodius
• †Cyphaspis
• †Cypricardella
• †Cypricardinia
• †Cypricardinia sulcifera
• †Cyrtia
• †Cyrtia exporrecta
• †Cyrtina
• †Cyrtina inulta
• †Cyrtina iowaensis
• †Cyrtina triquetra
• †Cyrtina umbonata
• †Cyrtodonta
• †Cyrtolites
• †Cyrtospira
• File:Cyrtospirifer verneuili duo.jpg]] †Cyrtospirifer
• †Cyrtospirifer disjunctus
• †Cyrtospirifer whitneyi
• †Cystiphyllum
• †Cystiphyllum mundulum
• †Cystodictya
• †Cytocrinus

{{Compact TOC}}

• †Dalejina
• †Dalmanella
• †Dalmanella edgewoodensis – or unidentified comparable form
• File:SilurianTrilobite.jpg]] †Dalmanites
• †Dapsilodus
• †Dapsilodus mutatus
• †Dawsonoceras
• †Decadocrinus
• †Decadocrinus crassidactylus – type locality for species
• †Decadocrinus pachydactylus – type locality for species
• †Decadocrinus spinulifer – type locality for species
• †Decaschisma
• †Dechenella
• †Dechenella haldemani – or unidentified comparable form
• †Dechenella nortoni
• †Dechenella prouti
• †Dechenella rowi – or unidentified comparable form
• File:Deiphon forbesi cropped.png]] †Deiphon
• †Delocrinus
• †Delocrinus vulgatus
• †Deltaherpeton – type locality for genus
• †Deltaherpeton hiemstrae – type locality for species
• †Delthyris – tentative report
• †Deltodus
• †Deltodus spatulatus
• †Dendrocrinus
• †Dendrocrinus casei
• †Dendrocrinus curvijunctus – or unidentified related form
• †Dendrocrinus oswegoensis
• File:Dentalium octangulatum 01.JPG tusk shell]] †Dentalium
• †Dentalium grandaevum
• †Derbyia
• †Desquamatia
• †Desquamatia brandonensis
• †Desquamatia independensis
• †Desquamatia randalia
• †Desquamatia rotunda
• †Desquamatia rusica
• †Desquamatia scutiformis
• †Desquamatia waterlooensis
• †Devonatrypa
• †Devonatrypa brandonensis
• †Devonatrypa pronis
• †Devonatrypa trowbridgei
• †Devonatrypa waterlooensis
• †Devonochonetes
• †Devonochonetes calivini
• †Devonoproductus
• †Devonoproductus reticulocostus
• †Devonoproductus vulgaris
• †Devonoproductus walcotti
• †Diamphidiocystis
• †Diceromyonia
• †Dichacaenia
• †Dichacaenia harberti
• †Dichocrinus
• †Dicoelosia
• †Dicranella
• †Dicranella bicornis
• †Dicranella marginata
• †Dicranella simplex
• †Dicranella spinosa
• †Dicranella typa
• †Dicranopeltis
• †Dictyoclostus
• †Dictyotomaria
• †Dictyotomaria quasicapillaria – type locality for species
• †Dielasma
• †Dielasma burlingtonensis
• †Dielasma chouteauensis
• †Dielasma formosum
• †Dimerocrinites
• †Dimerocrinites hopkintonensis
• †Dimerocrinites pentangularis
• †Dimerocrinites sculptus
• †Dinobolus
• †Dinolobus
• †Dinorthis
• †Diopatraites
• †Diphyphyllum
• †Diploblastus
• †Diploblastus glaber
• File:Diplograptus simplex.png]] †Diplograptus
• †Diplograptus modestus – or unidentified comparable form
• †Diplophyllum
• †Diplosphaerina
• †Diplosphaerina inaequalis
• †Discosorus
• †Disphyllum
• †Disphyllum conjugans – type locality for species
• †Disphyllum dispassum
• †Disphyllum floydense
• †Disphyllum iowensis – type locality for species
• †Disphyllum tubiforme
• †Dolerorthis
• †Donaldina – tentative report
• †Dorycrinus
• †Dorycrinus gouldi
• †Dorycrinus mississippiensis
• †Douvillina
• †Douvillina arcuata
• †Douvillina cayuta
• †Douvillina delicata
• †Douvillina distans
• †Douvillina maxima
• †Douvillina navicula
• †Douvillina oxycostratum
• †Douvillina variabilis
• †Douvillinaria
• †Douvillinaria delicata
• †Douvillinaria perversa
• †Douvillinaria variabilis
• †Douvillinaria variablis
• †Drepanoistodus
• †Drepanoistodus suberectus
• †Dudleyaspis
• †Dvorakia
• †Dvorakia chattertoni – type locality for species

{{Compact TOC}}

• †Earlandia
• †Ecclimadictyon
• †Ecclimadictyon fastigiatum
• †Echinocoelia
• †Echinocoelia halli
• †Echinoconchus
• †Ectenocrinus
• †Ectenocrinus raymondi
• †Ectenocrinus simplex
• †Ectodemites
• †Ectodemites primus
• †Ectogrammysia
• †Ectogrammysia hannibalensis
• File:Edestus protopirata1DB.jpg]] †Edestus
• †Edestus crenulata
• †Edestus mirus – type locality for species
• †Edmondia
• †Edmondia jejunus
• †Eldredgeops
• †Eldredgeops rana
• †Eleutherokomma
• †Eleutherokomma jasperensis
• †Elita
• †Elita diversa
• †Elita inconsueta
• †Elita johnsonensis
• †Elita minor
• †Elita subundifera
• †Elita urbana
• †Ellesmeria
• †Ellesmeria scobeyi
• †Ellesmeroceras
• †Ellesmeroceras luthei
• †Ellesmeroceras thomasi
• †Emanuella
• †Emanuella ii – report made of unidentified related form or using admittedly obsolete nomenclature
• †Emanuella meristoides
• †Emanuella sublineata
• †Emphereaster
• †Emphereaster missouriensis
• †Encrinurus
• File:Endoceras.JPG]] †Endoceras
• †Endostaffella
• †Endostaffella discoidea
• †Endothyra
• †Endothyra obsoleta – tentative report
• †Endothyranella
• †Enoploura
• †Enoploura wetherbyi
• †Enteletes
• †Entelophyllum
• Eocaudina
• †Eocaudina septaforaminalis – type locality for species
• †Eochonetes
• †Eochonetes aspera
• †Eochonetes dignata – type locality for species
• †Eochonetes recedens
• †Eodictyonella
• †Eolissochonetes
• †Eomartiniopsis
• †Eomartiniopsis rostrata
• †Eoparisocrinus
• †Eoparisocrinus crossmani
• †Eophacops
• †Eoplectodonta
• †Eoschmidtella
• †Eoschmidtella umbonata
• †Eospirifer
• †Eospirifer radiatus
• †Eospirigerina
• †Eospirigerina putilla – or unidentified comparable form
• †Eostrophalosia
• †Eostrophalosia independensis
• †Eostrophalosia inexpectans
• †Eostrophalosia rockfordensis
• †Eosyringothyris
• †Eosyringothyris aspera
• †Eosyringothyris occidentalis
• †Eosyringothyris thomasi
• †Eosyringothyris triangularis
• †Ephippiorthoceras
• †Eridoconcha
• †Eridoconcha gibbera
• †Eridoconcha punctata
• †Eridotrypa
• †Erismacanthus
• †Erismacanthus barbatus
• †Erismodus
• †Erismodus radicans
• †Escharopora
• File:EucalyptocrinitesCalyx.jpg]] †Eucalyptocrinites
• †Eucalyptocrinites depressus
• †Eucalyptocrinites inornatus
• †Eucalyptocrinites ornatus – or unidentified comparable form
• †Eucalyptocrinites proboscidalis
• †Eukloedenella
• †Eukloedenella richmondensis
• †Eumetria
• †Eumetria iowensis
• †Eumetria osagensis
• †Eumorphocystis
• †Eunema
• †Eunema quadrisulcata
• File:Euomphalus fossil cropped.png]] †Euomphalus
• †Euomphalus angularis
• †Euomphalus obtusus
• †Euphemites
• †Euphemites lentiformis
• †Euphemites urei
• †Euprimitia
• †Euprimitia celata
• †Euprimitia flores
• †Euprimitia labiosa
• †Euprimitia linepunctata
• †Euprimitia minuta
• †Euprimitia sanctipauli
• †Euptychocrinus
• †Euptychocrinus skopaios
• †Eurychilina
• †Eurychilina incurva
• †Eurychilina minutifoveata
• †Eurychilina partifimbriata
• †Eurychilina reticulata
• †Eurychilina subradiata
• †Eurychilina ventrosa
• †Eutaxocrinus
• †Eutaxocrinus gracilis
• †Exocrinus
• †Exocrinus multirami

{{Compact TOC}}

• †Fardenia – tentative report
• †Favosites
• †Fenestella
• †Fenestrellina
• †Ferganella
• †Fistulipora
• †Flabellitesia
• †Flabellitesia flabellites
• File:Flexicalymene-ouzregui-rolled.jpg]] †Flexicalymene
• †Floweria
• †Floweria altirostris
• †Floweria orthoplicata
• †Floweria prava
• †Floyda
• †Floyda concentrica
• †Fourstonella

{{Compact TOC}}

• †Galateacrinus
• †Galateacrinus gossameri
• †Gilmocrinus
• †Girtyella
• †Girtyella indianse
• †Glabrocingulum
• †Glabrocingulum angulosa – type locality for species
• †Glabrocingulum minutum – type locality for species
• †Glaphyrites
• †Glossites
• †Glyptorthis
• †Glyptorthis pulchra – type locality for species
• †Glyptorthis subcircularis – type locality for species
• †Gomphocystites
• File:Goniatitidae - Goniatites species.JPG]] †Goniatites
• †Goniocrinus
• †Goniophyllum
• †Goniophyllum pyramidale
• †Gorgonophontes
• †Gorgonophontes peleron
• †Graffhamicrinus
• †Graffhamicrinus magnijkus
• †Graffhamicrinus subcoronatus
• †Grammysia
• †Grammysia amygdalinus
• †Gravicalymene
• †Greenops
• †Greenops barrisi
• †Greenops fitzpatricki
• File:RugosaOrdovician.jpg]] †Grewingkia
• †Gypidula
• †Gypidula cornuta
• †Gypidula munda
• †Gypidula occidentalis
• †Gypidula papyracea
• †Gypidula parva
• †Gypidulina
• †Gyroceras

{{Compact TOC}}

• †Hadrorhynchia
• †Hadrorhynchia solon
• †Haeretocrinus
• †Haeretocrinus missouriensis
• †Hagnocrinus
• †Hallatia
• †Hallatia convexa
• †Hallatia duplicata
• †Hallatia particylincrica
• †Hallatia particylindrica
• †Hallicystis
• †Halliella
• †Halliella magnipunctata
• File:Hallopora multitabulata fossil bryozoan (Ordovician; Frankfort IL.jpg]] †Hallopora
• †Halysiocrinus
• †Halysiocrinus barrisi
• †Halysiocrinus elephantinus – type locality for species
• †Halysites
• †Hammatostroma
• †Hammatostroma albertense
• †Harpidella – tentative report
• †Harpidella brandonensis
• †Harpidium
• †Harpidium luckeyensis – or unidentified related form
• †Harpidium maquoketa
• †Hedeina
• †Heliolites
• File:Heliophyllum halli Bethany Center Centerfield 2.jpg]] †Heliophyllum
• †Heliophyllum solidum
• †Helliella
• †Helliella magnipunctata
• †Hemicystites
• †Hemiphragma
• †Hemiplethorhynchus
• †Hemiplethorhynchus subovatum
• †Hermatostroma
• †Hermatostroma polymorphum
• †Hernodia
• †Hesperidella
• †Hesperidella initialis
• File:Hexagonaria percarinata close view.JPG, also known as a Petoskey stone]] †Hexagonaria
• †Hexagonaria bassleri
• †Hexagonaria inequalis
• †Hexagonaria oweni
• †Hexagonaria whitfieldi
• †Hibbardella
• †Hibbardella subacoda
• †Hindella
• †Hindia
• †Hindia parva – tentative report
• †Hindia sphaeroidalis
• †Holcocrinus
• File:Holopeidae - Holopea praestans.JPG]] †Holopea
• †Holopea iowaensis
• †Homacanthus
• †Homacanthus delicatulus
• †Homoeospira
• †Homotrypella
• †Hormotoma
• †Hormotoma gracilis
• †Howellella
• †Hudsonaster
• †Huronia
• †Hustedia
• †Hyattidina
• †Hybocrinus
• †Hybocrinus conicus

File:Hyoliths02.JPG]] †Hyolithes

• †Hyolithes parviusculus
• †Hypergonia
• †Hypergonia percarinata
• †Hypothyridina
• †Hypothyridina emmonsi
• †Hypothyridina intermedia
• †Hypothyridina magister
• †Hypselocrinus
• †Hypsitycha
• †Hypsitycha hybrida
• †Hysitycha
• †Hysitycha neenah
• †Hystriculina

{{Compact TOC}}

• †Ianthinopsis
• †Ianthinopsis pinguis – type locality for species
• †Icriodus
• †Icriodus calvini – type locality for species
• †Icriodus latericrescens
• †Icriodus nodosus
• †Icriodus orri – type locality for species
• †Icriodus subterminus
• †Icthyocrinus
• †Idiognathodus
• †Idiognathodus attenuatus – type locality for species
• †Idiognathodus claviformis
• †Idiognathodus iowaensis – type locality for species
• †Ignoceras
• †Ignoceras undata
• †Indospirifer
• †Indospirifer orestes
• File:Iniopteryxrushlaui.JPG]] †Iniopteryx
• †Iniopteryx rushlaui
• †Iniopteryx tedwhitei
• †Iocrinus
• †Iowacystis
• †Iowacystis sagittaria
• †Iowaphyllum
• †Iowaphyllum johanni
• †Iowatrypa
• †Iowatrypa americana
• †Iowatrypa owenensis
• †Ischadites
• †Isorthis
• †Isorthoceras
• †Isorthoceras sociale
• File:Isotelus brachycephalus.JPG.]] †Isotelus

{{Compact TOC}}

• †Juresania

{{Compact TOC}}

• †Kaskia
• †Kayoceras
• †Kiesowia
• †Kiesowia binoda
• †Kiesowia insolens
• †Kinocrinus
• †Kinocrinus inflatus
• File:Kionoceras doricum.JPG]] †Kionoceras
• †Kionoceras decorahense – type locality for species
• †Kirkidium
• †Kitikamispira – tentative report
• †Kitikamispira perstrialis – type locality for species
• †Knightella
• †Knightella shumardiana – type locality for species
• †Kosovopeltis
• †Kosovopeltis acamas
• †Krausella
• †Krausella arcuata
• †Krausella curtispina
• †Krausella inaequalis
• †Krinocrinus
• †Krinocrinus inflatus

{{Compact TOC}}

• †Laccoprimitia
• †Laccoprimitia elegantula
• †Laccoprimitia fillmorensis
• †Lacertasterias – type locality for genus
• †Lacertasterias elegans – type locality for species
• †Laddella
• †Laddella insueta
• †Ladogioides
• †Ladogioides solon
• Laevidentalium
• †Lamottia
• †Lamottia heroensis
• †Lampterocrinus
• †Lanecrinus – tentative report
• †Leangella
• †Lecanocrinus
• †Lecathylus
• †Lecathylus gregarius
• †Lechritochoceras
• †Leioclema
• †Leioclema occidens
• †Leiorhynchus
• †Leiorhynchus argenteum
• †Leiorhynchus gosseleti
• †Leiorhynchus iris
• †Leperditella
• †Leperditella dorsicornis
• †Leperditella fryei
• †Leperditella macra
• †Leperditella millepunctata
• †Leperditella persimilis
• †Leperditella sacceliformis
• †Leperditia
• †Lepidocyclus
• †Lepidoleptaena – or unidentified related form
• †Leptaena
• †Leptaena rhomboidalis
• †Leptagonia
• †Leptagonia analoga
• †Leptellina
• †Leptobolus
• †Leptobolus occidentalis
• †Leptodesma
• †Leptodesma acutilaris
• †Leptodesma subovata
• †Leptopora
• †Leptopora typa
• †Leptoptygma
• †Leptoptygma oligospira – type locality for species
• †Leptostrophia – tentative report
• †Leptotrypella
• †Lichenalia
• †Lichenocrinus
• File:Lingula anatina 7 .JPG]] †Lingula
• †Lingula changi
• †Lingula cuneata
• †Lingula fragila
• †Lingula milwaukeensis – or unidentified comparable form
• †Lingula milwaukiensis
• †Lingulodiscina
• †Lingulodiscina marginalis
• †Linocrinus
• †Linoporella
• †Linoproductus
• †Linoproductus ovatus
• †Liospira
• †Liospira micula
• †Liospira spicula – or unidentified comparable form
• †Litostrobus
• †Litostrobus iowensis
• †Litostrobus paulus
• †Lonchodus – tentative report
• †Lophophyllidium
• †Lophospira
• †Lophospira depauperata
• †Lorangerella
• †Lorangerella gregaria
• †Loxonema
• †Lumbriconereites
• †Luxocrinus
• †Luxocrinus simplex
• †Lyonicrinus
• †Lyriocrinus
• †Lysocystites
• †Lysocystites nodosus
• †Lytospira

{{Compact TOC}}

• †Macgeea
• †Macgeea camplanulata – type locality for species
• †Macgeea concinnula – type locality for species
• †Macgeea culmula
• †Macgeea solitaria
• †Macrocrinus
• †Macrocrinus mundulus
• Macrocypris
• †Macrocypris kayi
• †Macrocyproides
• †Macrocyproides clermontensis
• †Macronotella
• †Macronotella arcta
• †Macronotella scofeldi
• †Macronotella scofieldi
• †Macropotamorhynchus
• †Macropotamorhynchus tuta
• †Macrostylocrinus
• †Macrostylocrinus compressus
• †Macrostylocrinus obpyramidalis – or unidentified comparable form
• †Macrostylocrinus vermiculatus
• †Manicrinus
• File:Gephuroceratidae - Manticoceras species.JPG]] †Manticoceras
• †Manticoceras regulare
• †Manticrinus
• †Maquoketacrinus
• †Maquoketacrinus ornatus
• †Maratia
• †Maratia mara
• †Maratia micula
• †Marsupiocrinus
• †Marsupiocrinus primaevus
• †Mediospirifer
• †Megalomoidea
• †Megamyonia
• †Megamyonia unicostata
• †Megastrophia
• †Megastrophia profunda
• †Megistocrinus
• †Megistocrinus pernodosus
• †Melocrinites
• †Merista
• File:Meristella two views.png]] †Meristella
• †Meristella parva
• †Meristina
• †Merocrinus
• †Mesoblastus – or unidentified comparable form
• †Mesolobus
• †Metaconularia
• †Metalonchodina
• †Metalonchodina deflecta – type locality for species
• †Michelia
• †Michelinoceras
• †Microcardinalia
• †Milleratia
• †Milleratia cincinnatiensis
• †Milleratia cincinnattiensis
• †Mirifusella – type locality for genus
• †Mirifusella fortunata – type locality for species
• †Modiomorpha
• †Monomerella
• †Murchisonia
• †Myalina
• †Mycterops
• †Mycterops whitei – type locality for species
• †Myeinocystites
• †Myelodactylus
• †Mystrocephala
• †Mystrocephala pulchra – or unidentified comparable form
• †Mystrocephala raripustulosus
• †Mytilarca

{{Compact TOC}}

• †Nactocrinus
• †Nalivkinia – tentative report
• †Nataliana – type locality for genus
• †Nataliana sinuata – type locality for species
• File:Neritopsidae - Naticopsis.JPG]] †Naticopsis
• †Naticopsis depressa – type locality for species
• †Neopanderodus
• †Neospirifer
• †Neozaphrentis
• †Neozaphrentis pellaensis
• †Nervostrophia
• †Nervostrophia calvini
• †Nervostrophia canace
• †Nervostrophia contaderoensis
• †Nervostrophia extensa
• †Nervostrophia multinervosa
• †Nervostrophia rockfordensis
• †Nervostrophia solida
• †Nervostrophia thomasi
• †Newberria
• †Newberria cordiforme
• †Newberria johanni
• †Ningulella
• †Ningulella paucisulcata
• †Nodambichilina
• †Nodambichilina symmetrica
• †Nucellangium
• †Nucellangium glabrum
• †Nucleospira
• †Nucleospira barrisi
• File: Nuculidae - Nucula piacentina.jpg]] Nucula
• †Nucula glanparkensis
• †Nucula iowensis
• Nuculana
• †Nuculana sacata
• †Nuculites
• †Nuculites neglectus
• †Nuculopsis

{{Compact TOC}}

• †Odontopleura
• †Oepikina
• †Oistodus
• †Oistodus venustus
• †Onniella
• †Onniella quadrata
• File:OnychodusDB15.jpg]] †Onychodus
• †Opikatia
• †Opikatia emaciata
• †Opikatia rotunda
• †Opoa
• †Orbiculoidea
• †Orbiculoidea telleri
• †Orbiculoidea varsoviensis
• †Orbiculoidea wardi
• †Orecopia
• †Orecopia circinatus – type locality for species
• †Oriostoma
• †Orthoceras
• †Orthoceras indianense
• †Orthodesma
• †Orthograptus
• †Orthograptus eucharis
• †Orthograptus truncatus
• †Orthonychia
• †Orthonychia vomerium
• †Orthospirifer
• †Orthospirifer capax
• †Orthospirifer euruteines
• †Orthospirifer iowensis
• †Orthospirifer parryanus
• †Orthotetes
• †Orthotetes kaskaskiensis
• †Otarion – tentative report
• †Oulodus
• †Oulodus abbreviata – type locality for species
• †Oulodus serratus
• †Ovatia
• †Ovatia laevicostata
• †Ovatia ovata
• †Ozarkodina
• †Ozarkodina campbelli – type locality for species
• †Ozarkodina delicatula
• †Ozarkodina raaschi

{{Compact TOC}}

• †Pachyphyllum
• †Pachyphyllum crassicostatum
• †Pachyphyllum dumonti – type locality for species
• †Pachyphyllum gregarium
• †Pachyphyllum minutissimum
• †Pachyphyllum websteri
• †Pachyphyllum woodmani
• †Paladin
• †Paladin wilsoni
• †Palaeocapulus
• †Palaeocapulus equilateralis
• †Palaeoconcha
• †Palaeocyclus
• †Palaeoneilo
• †Palaeoneilo barrisi
• †Palaeoneilo fecunda
• †Palaeostachys
• †Palaeostachys andrewsii
• †Palaeozygopleura
• †Palaeozygopleura difficile
• †Palmatolepis
• †Palmatolepis foliacea
• †Palmatolepis semichatovae
• †Panderous
• †Panderous gracilis
• †Panderous panderi
• †Parabolbina
• †Parabolbina antecedans
• †Parabolbina carinifera
• †Parabolbina staufferi
• †Paracosmetocrinus
• †Paracyclas
• †Paracyclas dubia
• †Paracyclas dubius
• †Paracyclas elliptica
• †Paracyclas parvula
• †Paracyclas paucipleura
• †Paracyclas proavia
• †Paracyclas sabini
• †Paracyclas validalinea
• †Paracyclas validelinea
• †Paraphorhynchus
• †Paraphorhynchus elongatum
• †Paraphorhynchus striatocostatum
• †Paraschmidtella
• †Paraschmidtella irregularis
• †Paraschmidtella uphami
• †Parenthatia
• †Parenthatia camerata
• †Parenthatia punctata
• †Patellilabia
• †Patellilabia scriptiferus
• †Paucicrura
• †Paucicrura corpulenta
• †Paupospira
• File:Peachocaris strongi.jpg]] †Peachocaris
• †Peachocaris acanthouraea – type locality for species
• †Pedomphalella
• †Pedomphalella intermedia
• †Pedomphalella subovata
• †Pentamerella
• †Pentamerella dubia
• †Pentamerella laeviscula
• †Pentamerella laeviuscula
• †Pentamerella magna
• †Pentamerella multicostella
• †Pentamerella obsolescens
• †Pentamerella rugosa
• †Pentamerella subarata
• †Pentameroides
• †Pentameroides corrugatus
• †Pentameroides subrectus
• File:PentamerusSilurian.jpg]] †Pentamerus
• †Pentamerus oblongus
• †Pentlandina
• †Pentremites
• †Pentremites pulchellus
• †Perditocardinia
• †Perditocardinia iowensis – type locality for species
• †Periechocrinus
• †Pernopecten
• †Pernopecten cooperensis
• †Petalocrinus
• †Petalocrinus mirabilis
• File:Petalodus ohioensis fossil.jpg]] †Petalodus
• †Petalodus allegheniensis
• †Petalotrypa
• †Petalotrypa formosa
• †Petrocrania
• †Petrocrania famelica
• †Petrocrania familica
• †Petrodus
• †Petrodus patelliformis
• †Phacops
• †Phacops iowensis
• †Phanerotrema
• †Philhedra
• †Philhedra sheldoni
• †Phillipsia
• †Phoebodus
• †Phoebodus densneptuni – type locality for species
• †Pholidostrophia
• †Pholidostrophia iowensis
• †Phragmoceras
• †Phragmodus
• †Phragmodus cognitus
• †Phragmodus undatus
• †Phricodothyris
• †Phymatopleura
• †Physonemus
• †Physonemus hamuspiscatorius
• †Physonemus pandatus
• †Piloricilla
• †Piloricilla sedaliensis
• †Pinnocaris
• †Pinnocaris americana – type locality for species
• †Pisocrinus
• File:Plaesiomyiidae - Plesiomys subquadrata.JPG]] †Plaesiomys
• †Plaesiomys subquadrata
• †Plagioglypta
• †Plagioglypta iowaensis
• †Planalvus – type locality for genus
• †Planalvus gibberosa – type locality for species
• †Plasmopora
• †Platyceras
• †Platyceras antiquum
• †Platyceras insolitum
• †Platyceras irrasum
• †Platyceras latum – tentative report
• †Platyceras nasutum
• †Platyceras paralium
• File:Platycrinitidae - Platycrinites hemisphaericus cropped.jpg]] †Platycrinites
• †Platycrinus
• †Platylichas
• †Platyrachella
• †Platyrachella ballardi
• †Platyrachella macbridei
• †Platyschisma
• †Platyschisma barrisi
• †Platyschisma depressa
• †Platyschisma laudoni – type locality for species
• †Platystrophia
• †Platystrophia biforata
• †Plectatrypa
• †Plectodina
• †Plectodina aculeata
• †Plectodonta
• †Plectodonta produla
• File:Pleurocystites squamosus.jpg]] †Pleurocystites
• †Pleurocystites beckeri
• †Pleurocystites filitextus – tentative report
• †Pleurocystites strimplei
• Pleurotomaria – tentative report
• †Pleurotomaria verticillata
• †Plicochonetes
• †Plicostricklandia
• †Podolithus
• †Poleumita
• †Polusocrinus
• †Polusocrinus rosa
• File:Polygnathus Pa elements.png]] †Polygnathus
• †Polygnathus decorosus
• †Polygnathus intermedius
• †Polygnathus parawebbi
• †Polygnathus xylus
• †Polyplacognathus
• †Polyplacognathus ramosus
• †Polytryphocycloides
• †Polytylites
• †Polytylites wilsoni
• †Porcellia
• †Porcellia crassinoda
• †Porcellia obliquinoda
• †Porcellia rectinoda – type locality for species
• †Porocrinus
• †Porocrinus crassus
• †Porocrinus fayettensis
• †Porocrinus pentagonius
• †Porpites
• †Posidonia
• †Praecupulocrinus
• †Praecupulocrinus conjugans
• †Praenucula – tentative report
• †Praewaagenoconcha
• †Praewaagenoconcha speciosa
• †Prasopora
• †Prasoporina
• †Pregazacrinus
• †Pregazacrinus hemisphericus
• †Primitia
• †Primitia gibbera
• †Primitia spinata
• †Primitiella
• †Primitiella bellevuensis
• †Primitiella carlei
• †Primitiella constricta
• †Primitiella milleri
• †Primitiella plattevillensis
• †Primitiopsis – tentative report
• †Primitiopsis bella
• †Primitopsis – tentative report
• †Primitopsis bella
• †Priscella
• †Probillingsites
• †Productella
• †Productella belanskii
• †Productella camerata
• †Productella fragilis
• †Productella iowa
• †Productella linnensis
• †Productella perplana
• †Productella rugatula
• †Productella sericea
• †Productella subaculeata
• †Productella subalata
• †Productella thomasi
• †Productus
• †Productus arcuatus
• †Productus ovatus
• †Productus sedaliensis
• †Proetides
• †Proetides insignis
• File:Proetus concinnus reconstruction cropped.png]] †Proetus
• †Proetus channahonensis – or unidentified comparable form
• †Promexyele
• †Promexyele peyeri
• †Prospira
• †Prospira greenockensis – or unidentified related form
• †Prospira legrandensis
• †Protacrocrinus
• †Protatrypa
• †Protaxocrinus
• †Protoleptostrophia
• †Protoleptostrophia fragilis
• †Protomegastrophia
• †Protometgastrophia
• †Protoniella
• †Protoniella parva
• †Protoscolex
• †Pseudoammodiscus
• †Pseudoatrypa
• †Pseudoatrypa bentonensis
• †Pseudoatrypa blackhawkensis
• †Pseudoatrypa boyeri – or unidentified comparable form
• †Pseudoatrypa bremerensis
• †Pseudoatrypa devoniana
• †Pseudoatrypa minor
• †Pseudoatrypa percrassa
• †Pseudoatrypa rotunda
• †Pseudoatrypa rugatula
• †Pseudobelodina – tentative report
• †Pseudoconocardium
• †Pseudoglomospira
• †Pseudopalmula
• †Pseudopalmula palmuloides
• †Pseudoplagiothyra
• †Pseudoplagiothyra praecursor
• †Pseudozygopleura
• †Pseudulrichia
• †Pseudulrichia simplex
• †Pterinea
• †Ptychophyllum
• †Ptychopleurella
• †Ptychopleurella bouchardi – or unidentified comparable form
• †Ptychopteria
• †Ptychopteria chemungensis
• †Ptyctodopsis – type locality for genus
• †Ptyctodopsis menzeli – type locality for species
• File:Ptyctodus compressus cropped.jpg]] †Ptyctodus
• †Pugnoides
• †Pugnoides calvini
• †Pugnoides ottumwa
• †Punctaparchites
• †Punctaparchites rugosus
• †Punctaparchites splendens
• †Punctospirifer
• †Punctospirifer solidirostris
• †Pycnostylus
• †Pyramiblastus
• †Pyramiblastus fusiformis – type locality for species
• †Pyrgocystis

{{Compact TOC}}

• †Quasibollia
• †Quasibollia ridicula
• †Quienquecaudex
• †Quienquecaudex springeri

File:Rhamphodopsis threiplandi.jpg]]

{{Compact TOC}}

• †Raphistomina
• †Raymondatia
• †Raymondatia goniglypta
• †Raymondatia gonigplyta
• †Raymondiata
• †Raymondiata goniglypta
• †Resserella
• †Retichonetes
• †Retichonetes brandonensis
• †Reticularia
• †Reticularia cooperensis
• †Retispira
• †Retispira bilabiatus
• †Retispira deflectus
• †Retispira exilis
• †Retispira perelegans
• †Retispira type locality for species Kues & Batten 2001 – informal
• †Rhaphanocrinus
• †Rhaphistomina
• †Rhineoderma
• †Rhineoderma dinglensis
• †Rhipidium
• †Rhipidomella
• †Rhipidomella cuneata
• †Rhipidomella dalyana – or unidentified comparable form
• †Rhipidomella tenuicostata
• †Rhipidomella thiemei
• †Rhodocrinites
• †Rhombopora
• †Rhynchodus
• †Rhynchopora
• †Rhynchopora pustulosa
• †Rhynchopora rowleyi
• †Rhynchotrema
• †Rhynchotreta
• †Rhyssochonetes
• †Rhyssochonetes bellarugosis
• †Rigidella
• †Ripidiorhynchus
• †Ripidiorhynchus cedarensis
• †Rugosochonetes
• †Rugosochonetes multicastatus

{{Compact TOC}}

• †Saccelatia
• †Saccelatia angularis
• †Saccelatia arcuamuralis
• †Saccelatia arrecta
• †Saccelatia bullata
• †Saccelatia cletifera
• †Sanguinolites
• †Scaphelasma
• †Schellwienella
• †Schellwienella crenulicostata
• †Schellwienella inaequalis
• †Schellwienella inflata
• †Schellwienella planumbona
• †Schizoblastus
• †Schizoblastus roemeri
• †Schizodus
• †Schizodus sedaliensis
• †Schizodus trigonalis
• †Schizophoria
• †Schizophoria amanaensis
• †Schizophoria athabaskensis – or unidentified related form
• †Schizophoria athabaskiensis – or unidentified related form
• †Schizophoria chouteauensis
• †Schizophoria dorsata
• †Schizophoria floydensis
• †Schizophoria floydia
• †Schizophoria impressa
• †Schizophoria iowensis
• †Schizophoria landoni
• †Schizophoria lata
• †Schizophoria laudoni
• †Schizophoria macfarlanei
• †Schizophoria macfarlanii
• †Schizophoria minor
• †Schizophoria multistriata
• †Schizophoria subelliptica
• †Schmidtella
• †Schmidtella affinis
• †Schmidtella brevis
• †Schmidtella lacunosa
• †Schmidtella latimarginata
• †Schuchertella
• †Schuchertella acutistriata
• †Schuchertella altirostris
• †Schuchertella humboldtensis
• †Schuchertella iowensis
• †Schuchertella nodocostata
• †Schuchertella parva
• †Schuchertella pectiniformis
• †Scofielda
• †Scofielda bilateralis
• †Scofieldia
• †Scofieldia bilateralis
• †Scutellum
• †Scutellum depressum
• †Scutellum thomasi
• File:Scytalocrinidae - Scytalocrinus.JPG]] †Scytalocrinus
• †Selenella
• †Selenella pediculus
• †Semitextularia
• †Semitextularia thomasi
• †Septemchiton
• †Septemchiton iowaensis
• †Septemchiton iowensis
• †Septopora
• †Serpulospira
• †Serpulospira paradoxus – type locality for species
• †Setigerites
• †Shumardella
• †Sieberella – tentative report
• †Sieberella insolita
• †Sievertsia
• †Sigournea – type locality for genus
• †Sigournea multidentata – type locality for species
• †Similodonta
• †Similodonta obliqua
• †Simulodonta
• †Simulodonta obliqua
• †Sinuites
• †Sinuites subcompressa
• †Siphonocrinus
• †Siphonocrinus nobilis
• †Skenidioides – tentative report
• †Skenidium
• †Skenidium independense
• †Smithiphyllum
• †Smithiphyllum belanskii
• †Sowerbyella
• †Spathella
• †Sphaerirhynchia
• File:SphenothallidHoldfastOrdovician.jpg]] †Sphenothallus
• †Spinatrypa
• †Spinatrypa aspera
• †Spinatrypa augusticostata – or unidentified comparable form
• †Spinatrypa bellula
• †Spinatrypa borealis
• †Spinatrypa hystrix
• †Spinatrypa mascula
• †Spinatrypa occidentalis
• †Spinatrypa planosulcata
• †Spinatrypa rockfordensis
• †Spinatrypa trulla
• †Spinatrypina
• †Spinatrypina angusticostata – or unidentified comparable form
• †Spinatrypina edmundsi
• †Spinocarinifera
• †Spinocarinifera arcuata
• †Spinocarinifera arcuatus
• †Spinocyrtia
• †Spinocyrtia alta
• †Spinocyrtia ballardi
• †Spinocyrtia capax
• †Spinocyrtia cedarensis
• †Spinocyrtia corvirostra
• †Spinocyrtia curvirostra
• †Spinocyrtia cyrtiformis
• †Spinocyrtia cyrtinaformis
• †Spinocyrtia iowensis
• †Spinocyrtia macbridei
• †Spinocyrtia pulchra
• †Spinocyrtia westerensis
• †Spinulicosta
• †Spinulicosta spinulicosta
• File:Spirifer perlamosus pedunculate valve.jpg]] †Spirifer
• †Spirifer biplicoides
• †Spirifer forbesi
• †Spirifer gregeri
• †Spirifer legrandensis
• †Spirifer louisianensis
• †Spirifer marshallensis
• †Spirifer missouriensis
• †Spirifer orestes
• †Spirifer platynotus
• †Spirifer stratiformis
• †Spiriferina
• †Spiriferina solidirostris
• †Spiriferina solidirostrus
• †Spiriferina subtexta
• †Spirinella
• Spirorbis
• †Spyroceras
• †Stachyodes
• †Stachyodes costulata
• †Stainbrookia
• †Stainbrookia infera
• †Staufferella
• †Staufferella falcata
• †Stegocoelia
• †Stegocoelia quadricincta – type locality for species
• †Stenopareia
• †Stenopareia slocomi – or unidentified comparable form
• †Stenopareiea
• †Stephanocrinus
• †Stereostylus
• †Stereostylus aages – type locality for species
• File:Steth pair1 cropped.jpg]] †Stethacanthus
• †Stethacanthus depressus
• †Stethacanthus erectus
• †Stictopora
• †Stictostroma
• †Stictostroma ordinarium
• †Straparollus
• †Straparollus ammon
• †Straparollus argutus – type locality for species
• †Straparollus cyclostomus
• †Straparollus macromphalus
• †Streptelasma
• †Streptelasma trilobatum – or unidentified comparable form
• †Streptis
• †Streptognathodus
• †Streptognathodus delicatulus – type locality for species
• †Streptognathodus symmetricus – type locality for species
• †Streptorhynchus
• †Streptorhynchus tenuicostatum
• †Striatochonetes
• †Striatochonetes buchananensis
• †Striatochonetes schucherti
• †Striatopora
• †Striatopora iowensis
• †Stricklandia
• †Stricklandia laevis
• †Stricklandia lens
• †Striispirifer
• †Strimplecrinus
• †Strobilocystites
• †Stromatopora
• †Strophalosia
• †Strophodonta
• †Strophodonta umbonata
• †Stropholosia
• †Stropholosia littletonensis
• File:Strophomena costellata brachial.jpg]] †Strophomena
• †Strophomena abnormalis
• †Strophomena biplacata
• †Strophomena cedarensis
• †Strophomena cicatricosa
• †Strophomena costata
• †Strophomena dorsata
• †Strophomena erratica
• †Strophomena halli
• †Strophomena iowensis
• †Strophomena linderi
• †Strophomena littleonensis
• †Strophomena littletonensis
• †Strophomena masonensis
• †Strophomena mineolaensis
• †Strophomena nortoni
• †Strophomena parva
• †Strophomena perarcuata
• †Strophomena planodorsata
• †Strophomena plicata
• †Strophomena quadratella
• †Strophomena randalia
• †Strophomena reticulata
• †Strophomena scottensis
• †Strophomena solonensis
• †Strophomena subdemissa
• †Strophomena thomasi
• †Strophomena trilobata – type locality for species
• †Strophomena unbonata
• †Strophomena vera
• †Strophonella
• †Strophonelloides
• †Strophonelloides reversa
• †Strophostylus
• †Strophostylus bivolve
• †Stylonema – tentative report
• †Sublobalocrinus
• †Sublobalocrinus kasseri
• †Sulcatostrophia
• †Sulcatostrophia camerata
• †Sulcatostrophia euglyphea
• †Sygcaulocrinus
• †Sygcaulocrinus typus
• File:Syringoporid.jpg]] †Syringopora
• †Syringostroma – tentative report
• †Syringostroma confertum
• †Syringothyris
• †Syringothyris halli
• †Syringothyris hannibalensis
• †Syringothyris newarkensis

{{Compact TOC}}

• †Tabulophyllum
• †Tabulophyllum buccinum – type locality for species
• †Tabulophyllum curtum – type locality for species
• †Tabulophyllum ehlersi
• †Tabulophyllum ellipticum
• †Tabulophyllum expansum
• †Tabulophyllum levorsoni – type locality for species
• †Tabulophyllum longum
• †Tabulophyllum magnum
• †Tabulophyllum mutabile – type locality for species
• †Tabulophyllum ponderosum
• †Tabulophyllum rectum
• †Tabulophyllum robustum
• †Tabulophyllum rotundum
• †Tabulophyllum solidum
• †Tanaocystis
• †Tanaocystis type locality for species – informal
• †Tarphyphyllum
• †Tarphyphyllum cylindricum – type locality for species
• File:Taxocrinidae - Taxocrinus.JPG (right)]] †Taxocrinus
• †Tecnocyrtina
• †Tecnocyrtina curvilineata
• †Tecnocyrtina missouriensis
• †Tenticospirifer
• †Tenticospirifer cyrtinaeformis
• †Tenticospirifer cyrtinaformis
• †Tenticospirifer shellrockensis
• †Tetradella
• †Tetradella carinata
• †Tetradella ellipsilira
• †Tetradella septinoda
• †Tetradella subquadrans
• †Tetradella ulrichi
• †Teutonophon
• †Teutonophon tangentialis
• †Thaerodonta
• †Thaerodonta recedens
• †Thalamocrinus
• †Theleproktocrinus
• †Theleproktocrinus davidsoni
• †Theodissa
• †Theodissa hungerfordi
• †Theodossia
• †Theodossia hungerfordi
• †Thomasaria
• †Thomasaria altumbona
• †Thomasatia
• †Thomasatia falcicosta
• †Thomasocrinus
• †Thomasocrinus cylindrica
• †Timeischytes
• †Torynifer
• †Trachydomia
• †Trachydomia variata
• †Tranodis
• †Trapezophyllum
• †Tremanotus
• †Trichinocrinus
• †Trigeria
• †Trimerella
• †Triplesia
• †Trochonema
• †Tropidodiscus
• †Trupetustroma
• †Trupetustroma bassleri
• †Trupetustroma hayense
• †Tubisalebra
• †Turbonopsis
• †Turbonopsis hackberryensis
• †Turbonopsis spiculatus – type locality for species
• †Tylothyris
• †Tylothyris bimesialis
• †Tylothyris inultilis
• †Tylothyris megista
• †Tylothyris mesacostalis
• †Tylothyris rockfordensis
• †Tylothyris subattenuatta
• †Tylothyris subvaricosa
• †Tylothyris sulcocostata

{{Compact TOC}}

• †Ulocrinus
• †Ulrichia
• †Ulrichia saccula
• †Unispirifer
• †Unispirifer minnewankensis – or unidentified comparable form
• †Unispirifer platynotus

{{Compact TOC}}

• †Variatrypa
• †Variatrypa arctica
• †Variatrypa lineata
• †Variatrypa rugatula
• †Verkhotomia – tentative report
• †Verkhotomia calvini

{{Compact TOC}}

• †Waagenella
• †Waagenella sowerbyi – tentative report
• †Warrenella
• †Warrenella extensa
• †Warthia
• †Wellerella
• †Westerna
• †Westerna gigantea
• †Whatcheeria – type locality for genus
• †Whatcheeria deltae – type locality for species
• †Whidbornella
• †Whidbornella lachrymosa
• †Whitfieldella
• †Winchellatia
• †Winchellatia lansingensis
• †Winchellatia longispina
• †Winchellatia minnesotensis
• †Worthenia

{{Compact TOC}}

• †Youngia

{{Compact TOC}}

• †Zaphrenthis
• †Zaphrenthis calceola
• †Zaphrenthis cliffordana
• †Zygobolboides
• †Zygobolboides calvini
• †Zygobolboides grafensis
• †Zygobolboides iowensis
• †Zygobolboides thomasi
• †Zygospira
• †Zygospira resupinata

• {{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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*Paleozoic

Iowa