megalops

from The Century Dictionary.

• noun In ichthyology, a genus of elopine fishes, representing the subfamily Megalopinæ of the family Elopidæ, founded by Lacépède in 1803. M. atlanticus is a large species, known as the tarpon.
• noun [lowercase] A spurious genus of decapod crustaceans, representing a stage in the development of crabs in which the eyes are enormous.
• noun A genus of rove-beetles or staphylinids, containing a few small species of America and Africa.
• noun A genus of reptiles.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Zoöl.) A larva, in a stage following the zoëa, in the development of most crabs. In this stage the legs and abdominal appendages have appeared, the abdomen is relatively long, and the eyes are large. Also used adjectively.
• noun A large fish; the tarpum.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun zoology A larva, in a stage following the zoea, in the development of most crabs. In this stage the legs and abdominal appendages have appeared, the abdomen is relatively long, and the eyes are large.
• noun A large fish; the tarpum.