Classification of the genus Nassicola
Subg. †Siphonalia (Nassicola) Finlay 1924
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†Siphonalia (Nassicola) bicarinata Dickerson 1915
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†Siphonalia (Nassicola) bicarinata crooki Clark 1938
†Siphonalia (Nassicola) bicarinata monospina Turner 1938
†Siphonalia (Nassicola) bicarinata wheatlandensis Clark and Anderson 1938
†Siphonalia (Nassicola) bicarinata packi Ruth 1942
†Siphonalia (Nassicola) clarki Dickerson 1914
†Siphonalia (Nassicola) sopenahensis Weaver 1912
†Siphonalia (Nassicola) sutterensis Dickerson 1913
†Siphonalia (Nassicola) thunani Dickerson 1916
†Siphonalia (Nassicola) tularensis Anderson and Hanna 1925