Diphycercal

ahd-5
  • adjective. 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.
    • The Century Dictionary and Cyclopedia
  • In ichthyology, having the tail symmetrical, or consisting of equal upper and lower halves, with respect to the bones which support it, the end of the spinal column or the notochord not being bent upward as is usually the case in fishes. See homocercal, hypural, heterocercal.
    • the GNU version of the Collaborative International Dictionary of English
  • adjective. Having the tail fin divided into two equal parts by the notochord, or end of the vertebral column; protocercal. See protocercal.
    • Wiktionary, Creative Commons Attribution/Share-Alike License
  • adjective. Describing a symmetric tail fin in which the vertebral column extends to the tip
    • Word Usage
    "Vertebrated but symmetrical fin (diphycercal) 170 71."
    variant
    protocercal  
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