Corbicula subelliptica (Meek & Hayden, 1856) † (basis of record)
Obovaria pyramidella (Whitfield, 1907) † accepted as Proparreysia pyramidella (Whitfield, 1907) † (basis of record)
Plesielliptio gibbosoides (Whitfield, 1907) † accepted as Plesielliptio stantoni (C. A. White, 1907) † (basis of record)
Plesielliptio postbiplicatus (Whitfield, 1903) † (basis of record)
Plesielliptio vetustus (Meek, 1860) † (basis of record)
Plesielliptio whitfieldi L. S. Russell, 1976 † (original description)
Plethobasus aesopiformis (Whitfield, 1903) † (basis of record)
Plethobasus biesopoides (Whitfield, 1907) † (basis of record)
Pleurobema cryptorhynchus (C. A. White, 1877) † (basis of record)
Pleurobema proavitum (C. A. White, 1877) † (basis of record)
Proparreysia barnumi (Pilsbry, 1904) † (basis of record)
Proparreysia corbiculoides (Whitfield, 1907) † (basis of record)
Proparreysia holmesiana (C. A. White, 1877) † (basis of record)
Proparreysia letsoni (Whitfield, 1907) † (basis of record)
Proparreysia paucinodosa L. S. Russell, 1976 † (original description)
Proparreysia percorrugata (Whitfield, 1903) † (basis of record)
Proparreysia pyramidatoides (Whitfield, 1907) † (basis of record)
Proparreysia retusoides (Whitfield, 1903) † (basis of record)
Proparreysia verrucosiformis (Whitfield, 1903) † (basis of record)
Quadrula cylindricoides (Whitfield, 1907) † (basis of record)
Rhabdotophorus aldrichi (C. A. White, 1878) † (basis of record)
Sphaerium beckmani L. S. Russell, 1976 † (original description)

Montana for Plesielliptio whitfieldi L. S. Russell, 1976 † 
Montana for Proparreysia paucinodosa L. S. Russell, 1976 † 
Montana for Sphaerium beckmani L. S. Russell, 1976 † 

Holotype AMNH 30701, identified as Plesielliptio whitfieldi L. S. Russell, 1976
Holotype AMNH 30702, identified as Proparreysia paucinodosa L. S. Russell, 1976
Holotype AMNH 30703, identified as Sphaerium beckmani L. S. Russell, 1976

 Type locality

 for Plesielliptio whitfieldi L. S. Russell, 1976 †

Hell Creek Formation, Snow Creek, Montana (USA) [details]

 Type locality

 for Proparreysia paucinodosa L. S. Russell, 1976 †

Hell Creek Formation, Snow Creek, Montana (USA) [details]

 Type locality

 for Sphaerium beckmani L. S. Russell, 1976 †

Not explicitly stated, but probably from Snow Creek, on the Missouri River (Montana, USA; see Russell 1976, p. 366) [details]