noun

• 1Now in form Megalops. A genus of marine fishes including the Indo-Pacific or ox-eye tarpon, Megalops cyprinoides, and the Atlantic tarpon, M. atlanticus (family Megalopidae).

• 2A free-swimming larval stage in the developments of crabs, following the zoea stage and having the adult number of trunk segments and legs, and large eyes; a crab in this stage.

  These larvae were at first mistakenly thought to represent a distinct genus, named Megalopa by W. E. Leach.