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Ginglymodi :: Ginglymodi (n.) An order of ganoid fishes, including the modern gar pikes and many allied fossil forms. They have rhombic, ganoid scales, a heterocercal tail, paired fins without an axis, fulcra on the fins, and a bony skeleton, with the vertebrae convex in front and concave behind, forming a ball and socket joint. See Ganoidel..

Heterocercy :: Heterocercy (n.) Unequal development of the tail lobes of fishes; the possession of a heterocercal tail.

Homocercal :: Homocercal (a.) Having the tail nearly or quite symmetrical, the vertebral column terminating near its base; -- opposed to heterocercal..

Heterocercal :: Heterocercal (a.) Having the vertebral column evidently continued into the upper lobe of the tail, which is usually longer than the lower one, as in sharks..

Cephalocercal :: Cephalocercal (a.) Relating to the long axis of the body.

Diphycercal :: Diphycercal (a.) Having the tail fin divided into two equal parts by the notochord, or end of the vertebral column; protocercal. See Protocercal..

Cercal :: Cercal (a.) Of or pertaining to the tail.

Homocercy :: Homocercy (n.) The possession of a homocercal tail.

Protocercal :: Protocercal (a.) Having a caudal fin extending around the end of the vertebral column, like that which is first formed in the embryo of fishes; diphycercal..

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