Allassostoma Stunkard, 1916 (additional source)
Allassostoma parvum Stunkard, 1916 accepted as Allassostomoides parvus (Stunkard, 1916) Stunkard, 1924 (original description)
Aspidogaster conchicola von Baer, 1827 (additional source)
Cotylaspis cokeri Barker & Parsons, 1914 (redescription)
Cotylaspis insignis Leidy, 1857 (additional source)
Polystoma hassalli Goto, 1899 accepted as Polystomoidella hassalli (Goto, 1899) accepted as Polystomoidella oblonga (Wright, 1879) Price, 1939 (redescription)
Polystoma megacotyle Stunkard, 1916 accepted as Polystomoides coronatum (Leidy, 1888) Ozaki, 1935 accepted as Polystomoides coronatus (Leidy, 1888) Ozaki, 1935 (original description)
Polystoma microcotyle Stunkard, 1916 accepted as Polystomoides coronatum (Leidy, 1888) Ozaki, 1935 accepted as Polystomoides coronatus (Leidy, 1888) Ozaki, 1935 (original description)
Polystoma opacum Stunkard, 1916 accepted as Polystomoides coronatum (Leidy, 1888) Ozaki, 1935 accepted as Polystomoides coronatus (Leidy, 1888) Ozaki, 1935 (original description)
Polystoma orbiculare Stunkard, 1916 accepted as Neopolystoma orbiculare (Stunkard, 1916) Price, 1939 accepted as Polystomoides orbiculare (Stunkard, 1916) Chaabane, Du Preez, Johnston & Verneau, 2022 (original description)
Zygocotyle Stunkard, 1916 (original description)
Zygocotyle ceratosa Stunkard, 1916 (original description)