diphycercal

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diph·y·cer·cal

 (dĭf′ĭ-sûr′kəl)
adj.
Having or designating a tail fin in which the vertebral column extends to the tip, with symmetrical upper and lower parts, as in the lungfishes.

[Greek diphuēs, double; see diphyodont + kerkos, tail + -al.]

diph·y·cer′cy (-sûr′sē) n.

diphycercal

(ˌdɪfɪˈsɜːkəl)
adj
(Zoology) ichthyol of or possessing a symmetrical or pointed tail with the vertebral column extending to the tip, as in primitive fishes
[C19: from Greek diphuēs twofold (from di1 + phuē growth) + kerkos tail]
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