They have powerful diphycercal tails that are long and paddle-shaped.
2.
Most Palaeozoic fishes had a diphycercal heterocercal tail.
3.
The body is covered with rod-shaped scales arranged in chevrons, and the tail is probably pad-shaped and diphycercal.
4.
(D )-"'Diphycercal "'means the vertebrae extend to the tip of the tail and the tail is symmetrical and expanded ( as in the bichir, lungfish, lamprey and coelacanth ).
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