- proctopterygia
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plural of proctopterygium
Dictionary of ichthyology. 2009.
proctopterygia
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proctopterygium — (plural proctopterygia)) anal fin (the median ventral fin or fins behind the anus. Abbreviated as A, or A1 and A2 if there are two. It functions to maintain equilibrium against rolling) … Dictionary of ichthyology
