Gastropoda - Euomphalina - Helicotomidae
Synonyms: Polhemia Cullison 1944, Walcottoma Rohr 1994
Full reference: A. H. Purdue and H.D. Miser. 1916. Eureka Springs - Harrison folio, Arkansas - Missouri. United States Geological Survey, Geological Atlas of the United States
Parent taxon: Helicotominae according to P. J. Wagner 1999
See also Cullison 1944, Knight et al. 1960, Morris and Cleevely 1981, Rohr 1994, Sepkoski 2002 and Wagner 2023
Sister taxa: Amphelissa, Boucotspira, Boucotspira, Helicotoma, Ophiletina, Palaeomphalus, Paraviviana, Yochelsoniella
Subtaxa: Lophonema abrupta Lophonema calphurnia Lophonema circumlirata Lophonema costata Lophonema frydai Lophonema orientalia Lophonema peccatonica Lophonema perstriata Lophonema taneyensis Lophonema tricarinata Lophonema wuhuensis
Type: Helicotoma peccatonica
Ecology: stationary epifaunal suspension feeder
Distribution:
• Whiterockian of United States (2: Nevada collections)
• Fennian of Malaysia (1)
• Arenigian of United States (1: Virginia)
• Ordovician of Canada (4: Newfoundland and Labrador, Quebec), China (1), Greenland (1), the United Kingdom (1), United States (39: Missouri, Texas, Vermont)
Total: 50 collections including 98 occurrences
Specimen images are retrieved through the ePANDDA API.
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