Strophomenata - Strophomenida - Sowerbyellidae
Alternative spelling: Ygerodiscus
Synonym: Paranisopleurella
Parent taxon: Eoplectodonta according to M. Rubel 2011
See also Sepkoski 2002 and Williams et al. 2000
Sister taxa: Eoplectodonta (Eoplectodonta), Eoplectodonta acuminata, Eoplectodonta bidecorata, Eoplectodonta budgei, Eoplectodonta california, Eoplectodonta duvalii, Eoplectodonta moelsi, Eoplectodonta nesnakomkaensis, Eoplectodonta oscitanda, Eoplectodonta penkillensis, Eoplectodonta percedens, Eoplectodonta praecursor, Eoplectodonta precursor
Subtaxa: Eoplectodonta (Ygerodiscus) bella Eoplectodonta (Ygerodiscus) cornuta Eoplectodonta (Ygerodiscus) striatacostatus Eoplectodonta (Ygerodiscus) transversalis Eoplectodonta (Ygerodiscus) undulata
Type: Leptaena transversalis
Ecology: stationary epifaunal suspension feeder
Distribution:
• Silurian of Canada (18: Northwest Territories, Nunavut, Quebec collections), the Czech Republic (2), Estonia (13), Lithuania (12)
• Ordovician to Silurian of Canada (1: Québec)
Total: 46 collections including 51 occurrences