Classification of the genus Helicancylus
G. †Helicancylus Gabb 1869
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†Helicancylus bonarellii Leanza 1970
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Invalid names: Paraleptoceras singulare Leanza 1970 [synonym]
†Helicancylus patagonicus Stolley 1912
Invalid names: Paraleptoceras Leanza 1970 [synonym]