Rhynchonellata - Orthida - Plaesiomyidae
Parent taxon: Plaesiomys according to Hall and Clarke 1892
Sister taxa: Dinorthis (Plaesiomys) saxbyana, Dinorthis (Plaesiomys) solaris, Plaesiomys (Valcourea), Plaesiomys anticostiensis, Plaesiomys bellilamellosus, Plaesiomys bellistriatus, Plaesiomys carletona, Plaesiomys cutterensis, Plaesiomys fidelis, Plaesiomys idahoensis, Plaesiomys iphigenia, Plaesiomys multiplicata, Plaesiomys occidentalis, Plaesiomys porcata, Plaesiomys proavita, Plaesiomys rockymontana, Plaesiomys saxbiana, Plaesiomys subcircularis, Plaesiomys subquadratus
Subtaxa: none
Ecology: stationary epifaunal suspension feeder
Distribution: found only at Section W-1. 062.5 - 065.5 m. South Thundercloud Range, District of Mackenzie (Ordovician of Northwest Territories)