proctal fin

proctal fin
anal fin (the median ventral fin or fins behind the anus. Abbreviated as A, or A1 and A2 if there are two. Also called proctopterygium, it functions to maintain equilibrium against rolling)

Dictionary of ichthyology. 2009.

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  • proctal — ˈpräktəl adjective Etymology: proct + al : situated immediately in front of the cloaca a fish with a proctal pelvic fin * * * proctal /prokˈtl/ adjective Anal or rectal ORIGIN: Gr prōktos anus …   Useful english dictionary

  • anal fin — the median ventral fin or fins behind the anus. Abbreviated as A, or A1 and A2 if there are two. Also called proctopterygium or proctal fin, it functions to maintain equilibrium against rolling …   Dictionary of ichthyology

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