Rhynchonellata - Orthida - Plaesiomyidae
Alternative combinations: Dinorthis (Plaesiomys) subquadrata occidentalis, Plaesiomys subquadratus occidentalis
Full reference: H. S. Ladd. 1929. The stratigraphy and paleontology of the Maquoketa shale of Iowa. Annual Report of the State Geologist 34:305-448
Belongs to Plaesiomys according to D. F. Wright and A. L. Stigall 2013
See also Ladd 1929 and Wang 1949
Sister taxa: Dinorthis (Plaesiomys) saxbyana, Dinorthis (Plaesiomys) solaris, Plaesiomys (Plaesiomys), Plaesiomys (Valcourea), Plaesiomys anticostiensis, Plaesiomys bellilamellosus, Plaesiomys bellistriatus, Plaesiomys carletona, Plaesiomys cutterensis, Plaesiomys fidelis, Plaesiomys idahoensis, Plaesiomys iphigenia, Plaesiomys multiplicata, Plaesiomys porcata, Plaesiomys proavita, Plaesiomys rockymontana, Plaesiomys saxbiana, Plaesiomys subcircularis, Plaesiomys subquadratus
Type specimen: SUI 66504. Its type locality is Along Primary Road No. 51, Postville, which is in a Maysvillian carbonate limestone in the Scales Shale Formation of Iowa.
Ecology: stationary epifaunal suspension feeder
Distribution:
• Ordovician of Canada (1: Northwest Territories collection), United States (4: Alaska, Iowa)
Total: 5 collections each including a single occurrence
Specimen images are retrieved through the ePANDDA API.
Click image to enlarge. Click to access iDigBio record.