Streptoneura

plural noun
Strep·​to·​neu·​ra

Definition of Streptoneura 

: a large subclass of Gastropoda including the majority of marine, some freshwater, and the operculate land gastropods having the loop of visceral nerves twisted into a figure 8 with the right half crossing in dextral forms above the left, sexes usually separate, and in most forms an operculum

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History and Etymology for Streptoneura

New Latin, from strept- + -neura

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