Fish fin - Wikipedia
https://en.wikipedia.org/wiki/Fish_fin
OverviewTypes of finsBony fishesCartilaginous fishesFin functionsEvolutionRobotic finsSee alsoFins can either be paired or unpaired. The pectoral and pelvic fins are paired, whereas the dorsal, anal and caudal fins are unpaired and situated along the midline of the body. For every type of fin, there are a number of fish species in which this particular fin has been lost during evolution (e.g. pelvic fins in †Bobasatrania, caudal fin in ocean sunfish). In some clades, additional unpaired fins were acquired during evolution (e.g. additional dorsal fins, adipose fin). In some †Acanthodii ("s…
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