Gastropoda - Euomphalina - Helicotomidae

Alternative combination: Helicotoma olsoni

Full reference: D. M. Rohr. 1980. Ordovician - Devonian Gastropoda from the Klamath Mountains, California. Palaeontographica Abteilung A 171:141-199

Belongs to Palaeomphalus according to P. J. Wagner 2023

See also Rohr 1980 and Wagner 1999

Sister taxa: Palaeomphalus glabra, Palaeomphalus obtusangulus

Type specimen: Its type locality is USNM 1812540 m NE of quartz diorite dike, southeast slope near top of ridge, which is in an Ashgill carbonate conglomerate/limestone in the Kangaroo Creek Formation of California.

Distribution: found only at USNM 18125. 40 m NE of quartz diorite dike, southeast slope near top of ridge

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Specimen images are retrieved through the ePANDDA API.