''Itagnostus'' is a

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...

trilobite Trilobites (; meaning "three lobes") are extinct marine arthropods that form the class Trilobita. Trilobites form one of the earliest-known groups of arthropods. The first appearance of trilobites in the fossil record defines the base of the At ...

restricted to the

Middle Cambrian Middle or The Middle may refer to: * Centre (geometry), the point equally distant from the outer limits. Places * Middle (sheading), a subdivision of the Isle of Man * Middle Bay (disambiguation) * Middle Brook (disambiguation) * Middle Creek (di ...

. Its remains have been found in

Asia Asia (, ) is one of the world's most notable geographical regions, which is either considered a continent in its own right or a subcontinent of Eurasia, which shares the continental landmass of Afro-Eurasia with Africa. Asia covers an area ...

Australia Australia, officially the Commonwealth of Australia, is a Sovereign state, sovereign country comprising the mainland of the Australia (continent), Australian continent, the island of Tasmania, and numerous List of islands of Australia, sma ...

Europe Europe is a large peninsula conventionally considered a continent in its own right because of its great physical size and the weight of its history and traditions. Europe is also considered a Continent#Subcontinents, subcontinent of Eurasia ...

, and

North America North America is a continent in the Northern Hemisphere and almost entirely within the Western Hemisphere. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and the Car ...

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

External links

''Peronopsis''
in the

Paleobiology Database The Paleobiology Database is an online resource for information on the distribution and classification of fossil animals, plants, and microorganisms. History The Paleobiology Database (PBDB) originated in the NCEAS-funded Phanerozoic Marine Pale ...

''Peronopsis''
at the

Field Museum The Field Museum of Natural History (FMNH), also known as The Field Museum, is a natural history museum in Chicago, Illinois, and is one of the largest such museums in the world. The museum is popular for the size and quality of its educational ...

's Evolving Planet {{Taxonbar, from=Q16983731 Peronopsidae Agnostida genera Cambrian trilobites Cambrian animals of Asia Trilobites of Asia Trilobites of Oceania Trilobites of Europe Trilobites of North America Fossil taxa described in 1979 Paleozoic life of British Columbia pl:Peronopsis Cambrian genus extinctions