The blade of the caudal fin is then divided into two nearly equal portions, and is said to be diphycercal.
The tail is diphycercal, and the pectoral fins are typical archipterygia.
In the Ctenodontidæ the tail is diphycercal, and no jugular plates are present in the known specimens.
In most primitive types, as in most embryonic fishes, the vertebræ grow smaller to the last (diphycercal).
Probably seven gill-openings were developed, and the tail was diphycercal, ending in a straight point.
The tail is diphycercal, heterocercal, or else it degenerates into a whip-like organ, a form which has been called leptocercal.
diphycercal, dif-i-ser′kal, adj. having the tail symmetrical (of fishes).
In Dipterus there are no marginal teeth, and the tail is heterocercal, not diphycercal, as in the other Dipnoans generally.
The tail may be heterocercal, as in Acipenser, or diphycercal as in Polypterus.
The tail is diphycercal in all, ending in a long point, and the body is covered with cycloid scales.