ho·mo·cer·cal 
(hō′mə-sûrkəl, hŏm′ə-)
(hō′mə-sûrkəl, hŏm′ə-)adj.
Relating to, designating, or characterized by a tail fin having two symmetrical lobes extending from the end of the vertebral column, as in most bony fishes.
[HOMO- + Greek kerkos, tail + -AL1.]
homocercalswordfish tail