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Definition of Term

caudal peduncle (View picture)
(English) The narrow part of the body between the posterior ends of the dorsal and anal fins and the base of the caudal fin, also: the wrist-like portion of the posterior part of the body between the end of the anal fin and the base of the caudal fin. Its length is measured between the insertion of the anal fin and the caudal flexure (the fold shown by the hind edge of the hypural plates when the caudal fin is flexed). Depth is measured vertically at the narrowest point. (See also: caudal fin, caudal flexure)

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