Bivalvia - Myalinida - Myalinidae

Alternative combination: Myalina spathi

Belongs to Promyalina according to K.W. Ciriacks 1963

Sister taxa: Promyalina diana, Promyalina groenlandica, Promyalina hunanensis, Promyalina kobjumensis, Promyalina kochi, Promyalina pavligae, Promyalina putiatinensis, Promyalina schamarae

Type specimen: AMNH 28349. Its type locality is Melrose, Claraia zone, Beaverhead County, which is in a Griesbachian marine mixed carbonate-siliciclastic in the Dinwoody Formation of Montana.

Ecology: facultatively mobile infaunal suspension feeder

Average measurements (in mm): shell length 18.1, valve length 21.5