cucuyo

from The Century Dictionary.

• noun The West Indian firefly, Pyrophorus noctilucus and another species, an elaterid beetle which gleams with phosphorescent light from spots on the body. See Pyrophorus, with cut.
• noun A fish (Balistes carolinensis), the leather-jacket; also another balistoid fish, Xanthichthys ringens, of the West Indies and waters southward.