gonopodium
Modified anal fin used in copulation for the transfer of male gametes to a female. In many cases only the anterior part of the fin is modified.
Used in 24 profiles
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Ichthyological terms, not general ones.
andropodium
Modified, flexible anal fin rays present in males of some fish species (families Hemirhamphidae and Goodeidae) giving the fin a 'notched' appearance. Not used for insemination like the gonopodium in members of the family Poecillidae but to clasp the female during mating.
Used in 5 profiles