Antistreptus is a genus of sea snail, a marine gastropod mollusk in the family Prosiphonidae, the true whelks.
Description (Original description) The shell is small, exhibiting the general form of Anachis, and is sinistral, but possesses a dextral nucleus. The operculum is as in Trophon.
Species Antistreptus contrarius (Thiele, 1912) Antistreptus magellanicus Dall, 1902 Antistreptus perversus (A. W. B. Powell, 1951) Antistreptus reversus (A. W. B. Powell, 1958)
Synonyms Antistreptus rolani Castellanos, 1986: synonym of Antistreptus magellanicus Dall, 1902
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