holocephalan

from WordNet (r) 3.0 (2006)

holocephalan
    n 1: fish with high compressed head and a body tapering off into
         a long tail [syn: {holocephalan}, {holocephalian}]

from The Collaborative International Dictionary of English v.0.48

holocephalan \holocephalan\ n.
   A member of the {Holocephali}, fish with high compressed
   heads and a bodies tapering off into a long tail. See also
   {Hoocephali}.
   [WordNet 1.5]