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1,156 littorinimorpha species
Phreatoceras taylori
Pyrgulopsis bernardina
Mexipyrgus carranzae
Littoridinops palustris
Pyrgulopsis aloba
Amnicola cora
Littoraria undulata
Fluminicola dalli
Simnia arcuata
Colligyrus greggi
Amnicola stygius
Phreatodrobia imitata
Cypraea tigris
Lyncina vitellus
Paludiscala caramba
Calyptraea mamillaris
Crepidula incurva
Marstonia ozarkensis
Vitrinella oldroydi
Phreatodrobia punctata
Petaloconchus montereyensis
Marstonia agarhecta
Phreatodrobia plana
Phreatodrobia micra
Lacuna marmorata
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