Pachystrophia Perner 1903 (snail)

Gastropoda - Euomphalina - Holopeidae

Full reference: J. Perner. 1903. Gastéropodes, Tome 1: Patellidae et Bellerophontidae 1-164

Parent taxon: Holopeidae according to P. J. Wagner 1999

See also Knight et al. 1960 and Sepkoski 2002

Sister taxa: Cyclora, Eopagodea, Holopea, Holopeinae, Raphistomina

Subtaxa: Pachystrophia balclatchiensis Pachystrophia contiguus Pachystrophia devexa Pachystrophia dilatata Pachystrophia gotlandicus Pachystrophia helicoides Pachystrophia inchoans Pachystrophia inornatum Pachystrophia lescarboti Pachystrophia mullockensis Pachystrophia orinini Pachystrophia subuloidea Pachystrophia triquestra Pachystrophia tuba Pachystrophia vortex

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Type: Euomphalus devexus

Ecology: stationary epifaunal suspension feeder

Distribution:

• Devonian of Canada (4: Northwest Territories, Quebec collections), Kazakhstan (1), United States (1: Nevada)

• Silurian of Canada (4: Nunavut, Ontario), China (1), the Czech Republic (7), Norway (1), Sweden (6), Ukraine (2), the United Kingdom (1), United States (3: Alaska, Illinois)

• Uhaku of Estonia (1)

• Whiterockian of Canada (1: Newfoundland and Labrador)

• Ordovician of the Czech Republic (2), Estonia (4), Norway (1), Poland (1), the United Kingdom (1), United States (11: Alaska, California, Colorado, Tennessee)

Total: 53 collections including 55 occurrences

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