pelvic fin

pelvic fin
the paired fin which is located posterior, ventral or anterior to the pectoral fins (abdominal, thoracic or jugular in position). Also called ischiopterygium. It functions to steer, brake and propel the fish and acts as a keel. In the pelvic fin ray count usually all the rays are counted except a small ray preceding the first ray and usually bound so closely to it so as to require dissection to be seen. In some fishes with reduced pelvics, the spine and the first ray may be bound together by a membrane and appear as one; both are counted, e.g. in Cottidae. Abbreviated as P2, P2 or V

Dictionary of ichthyology. 2009.

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  • pelvic fin — n. either of a pair of fins corresponding to the hind limbs of a higher vertebrate and associated with the pelvic girdle in fishes …   English World dictionary

  • pelvic fin — noun either of a pair of fins attached to the pelvic girdle in fishes that help control the direction of movement; correspond to hind limbs of a land vertebrate • Syn: ↑ventral fin • Hypernyms: ↑fin …   Useful english dictionary

  • pelvic fin — noun Zoology each of a pair of fins on the underside of a fish s body, attached to the pelvic girdle …   English new terms dictionary

  • pelvic fin — /pɛlvɪk ˈfɪn/ (say pelvik fin) noun → ventral fin …  

  • pelvic fin — (in fishes) either of a pair of fins on the lower surface of the body, corresponding to the hind limbs of a land vertebrate; ventral fin. [1905 10] * * * …   Universalium

  • pelvic fin — pel′vic fin′ n. ich (in fishes) either of a pair of fins behind and below the pectoral fins, corresponding to the hind limbs of a land vertebrate • Etymology: 1905–10 …   From formal English to slang

  • pelvic fin abductores — muscles originating on the outer surface of the pelvic plates and inserting on the outer surface of the fin radials …   Dictionary of ichthyology

  • pelvic fin adductores — muscles originating on the medial surface of the pelvic plates and inserting on the medial surface of the radials …   Dictionary of ichthyology

  • pelvic fin — noun Date: 1889 one of the paired fins of a fish that are homologous with the hind limbs of a quadruped …   New Collegiate Dictionary

  • pelvic fin — noun Either of a pair of fins on either side and towards the rear of a fish …   Wiktionary

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