Trilobita - Ptychopariida - Alokistocaridae
Synonym: Strotocephalus Resser 1935
Parent taxon: Alokistocaridae according to F. A. Sundberg 2018
See also Jell and Adrain 2002, Mason 1935, Palmer 1954, Palmer and Halley 1979, Sepkoski 2002, Sundberg 1999, Sundberg and McCollum 2000 and Sundberg and McCollum 2000
Sister taxa: Alokistocare, Alokistocarella, Amecephalina, Amecephaloides, Annamitia, Arellanella, Beldirella, Bythicheilus, Chancia, Chanciaopsis, Danzhaiaspis, Ehmania, Ehmaniella, Elrathia, Erdoradites, Ganovexopyge, Inglefieldia, Jenkinsonia, Kistocare, Lenacare, Parapachyaspis, Parehmania, Pedinocephalina, Proveedoria, Schopfaspis, Shabanovia, Tympanuella, Utaspis, Altiocculinae, Ehmaniellinae
Subtaxa: Amecephalus agnesensis Amecephalus arrojosensis Amecephalus cleora Amecephalus idahoense Amecephalus jamisoni Amecephalus laticaudum Amecephalus normale Amecephalus piochensis Amecephalus strangulatus Strotocephalus gordonensis
Type: Ptychoparia piochensis
Ecology: fast-moving low-level epifaunal carnivore
Distribution:
• Cambrian of Argentina (5 collections), Canada (13: British Columbia, Northwest Territories, Yukon Territory), Mexico (1), the Russian Federation (1), United States (39: California, Idaho, Nevada, Utah)
• Solvan of Canada (7: British Columbia), United States (7: Nevada)
Total: 73 collections including 78 occurrences
Specimen images are retrieved through the ePANDDA API.
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