heterocercal fin   (TTS Sound)

The heterocercal_fin has 1 Senses.

• heterocercal fin
• a tail fin with unequal lobes in which the vertebral column turns upward into the larger lobe as in sharks
• 脊柱が上方へとまがり、鮫のものより大きな、不等な突出物による尾ひれ