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anal fin

   Also found in: Encyclopedia 0.01 sec.
anal fin
n
(Life Sciences & Allied Applications / Zoology) a median ventral unpaired fin, situated between the anus and the tail fin in fishes, that helps to maintain stable equilibrium


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The prickly shark has no anal fin and two small spineless dorsal fins set far on the back by the tail.
2% SL; tip of anal-fin spine II broken in lectotype), relatively longer in juveniles, soft rayed portion of anal fin with anterior rays longest, posterior rays gradually shortening, posterior margin perpendicular to body axis or with slight posterior slant, anterior ray tips directly ventral to or forward of posterior tips, anterior tip of anal fin slightly rounded.
In mature male poeciliids the anal fin differentiates into an elongated structure called the gonopodium, used for sperm-transfer into the female genitalia during copulation.
 
 
 
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