Definition of Term

isocercal

(English) Describes a caudal fin in which the fin is formed by caudal rays plus the rear rays of the dorsal and anal fins, and is supported by the last several vertebrae. Thís type of caudal fin is symmetrical, as found in most modern bony fish, also diphycercal (an internally and externally symmetrical tail fin. May be secondarily acquired from the homocercal condition by loss of the real caudal fin and the gaining of a new one from dorsal and anal elements, e.g. in Gadidae). (See also: heterocercal, caudal fin, vertebrae)

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