The Collaborative International Dictionary of English v.0.48:

Cephaloptera \Ceph`a*lop"te*ra\
   (s[e^]f`[.a]*l[o^]p"t[-e]*r[.a]), n. [NL., fr. Gr. kefalh`
   head + ptero`n wing.] (Zool.)
   One of the generic names of the gigantic ray (Manta
   birostris) of the family Mobulidae, known as devilfish,
   sea devil, manta and manta ray. It is common on the
   coasts of South Carolina, Florida, and farther south, and is
   sometimes found as far north as New York Bay. Some of them
   grow to enormous size, becoming twenty feet of more across
   the body, and weighing more than a ton.
   [1913 Webster]