Itagnostus
{{Short description|Extinct genus of trilobites}}
{{Italic title}}
{{Taxobox
| name = Itagnostus
| fossil_range = {{fossilrange|508|497|earliest Mayan to earliest Batyrbayan}}
| image = Itagnostus interstrictus - Wheeler Schale, Utah, USA - Cambrian period (≈ -507 MA) - 39.25°N 113.33°W .jpg
| image_caption = Itagnostus interstrictus, until recently known as Peronopsis interstricta, from the Wheeler Shale, Utah
| regnum = Animalia
| phylum = Arthropoda
| classis = Trilobita
| ordo = Agnostida
| familia = Peronopsidae
| genus =Itagnostus
| genus_authority = Öpik, 1979
| subdivision_ranks = species
| subdivision =
- I. elkedrensis (Etheridge, 1902) (type)
- I. comis (Öpik, 1979)
- I. doylei (Laurie, 2006)
- I. gaspensis (Rasetti, 1948)
:: ssp. gaspensis
:: ssp. taitzuhoensis (Lu, 1957)
- I. interstrictus (White, 1874) synonyms Euagnostus levifrons, Peronopsis interstricta
:: ssp. interstrictus
:: ssp. robustus (Deiss, 1939) synonym Agnostus robustus
- I. krusei (Laurie, 2006)
- I. oepiki (Laurie, 2004)
- I. subhastatus (Geyer & Peel, 2017)
- I. walleyae (Laurie, 2006)
}}
Itagnostus is a genus of trilobite restricted to the Middle Cambrian. Its remains have been found in Asia, Australia, Europe, and North America.{{cite journal|last= Naimark|first= E.B.|year= 2012|title= Hundred species of the Genus Peronopsis Hawle et Corda, 1847|journal= Paleontological Journal|volume= 46|issue= 9|pages= 945–1057|doi= 10.1134/S0031030112090018|bibcode= 2012PalJ...46..945N|s2cid= 85130465}}
Distribution
- Itagnostus elkedrensis occurs in the Middle Cambrian of Australia (Ptychagnostus praecurrens-zone, Xystridura templetonensis-zone, and Dinesus-stage, Elkedra; Triplagnostus gibbus-zone, Sandover Beds; both Northern Territory), the Russian Federation (Kounamkites-zone, Nekekit River; Liostracus allachjunensis-zone, Lena River).
- Itagnostus comis is found in the Middle Cambrian of Australia (Triplagnostus gibbus-zone, Sandover Beds, Northern Territory).
* Itagnostus gaspensis gaspensis is reported from the Middle Cambrian of the United States (Geddes Formation, Nevada; Ptychagnostus atavus-zone, Wheeler Formation, Drum Mountains, Utah), Canada (upper part, Grosses Roches, St. Laurence, Quebec), Russian Federation (Tomagnostus fissus-zone, Lena River).
- Itagnostus gaspensis taitzuhoensis has been excavated from the Middle Cambrian of Antarctica (lower part, Shackleton Mountains), Australia (Ptychagnostus praecurrens-zone, Elkedra, Northern Territory), North-China (Bailiella-Lioparia-zone, Hsuchang Formation).
- Itagnostus interstrictus interstrictus is present in the Middle Cambrian of Canada (Ptychagnostus punctuosus-zone, Cow head Group, Newfoundland), the United States (Bolaspidella (P. atavus)-zone, Tatonduk River, Hillard Peak, Alaska; lower part of the Bolaspidella-zone, Western-Utah; Wheeler Shale, Antelope Spring, House Range, Utah), the Russian Federation (Malokuonamsky Horizon, Tomagnostus fissus-zone, and Liostracus allachjunensis-zone, all Lena River).
* Itagnostus krusei is found in the Middle Cambrian of the Russian Federation (Kounamkites-zone, Lena River).
- Itagnostus oepiki has been collected in the Middle Cambrian of Australia (Triplagnostus gibbus-zone, Sandover Beds; Xystridura templetonensis-zone, Elkedra; both Northern Territory).
- Itagnostus walleyae is reported from the Middle Cambrian of Australia (Ptychagnostus praecurrens-zone, Elkedra, Northern Territory).
- Itagnostus sp. has been collected in the Middle Cambrian of the Russian Federation (Liosttracus allachjunensis-zone, Lena River).
References
{{Reflist}}
External links
- [https://paleobiodb.org/classic/checkTaxonInfo?taxon_no=19293 Peronopsis] in the Paleobiology Database
- [https://web.archive.org/web/20090318000600/http://www.fieldmuseum.org/evolvingplanet/popUps/CO37.html Peronopsis] at the Field Museum's Evolving Planet
{{Taxonbar|from=Q16983731}}
Category:Cambrian animals of Asia
Category:Trilobites of Oceania
Category:Trilobites of North America
Category:Fossil taxa described in 1979
Category:Paleozoic life of British Columbia