leptocephalusEtymologyFrom (obsolete) genus name Leptocephalus, equivalent to Ancient Greek λεπτός (leptós, “thin, slim”) + κεφαλή (kephalḗ, “head”).leptocephalus means the flat, transparent larva of an eel, originally thought to be a distinct species. Lexicurio rates it Sui generis — a strength score of 88 out of 100.nounThe flat, transparent larva of an eel, originally thought to be a distinct species.“There they spawn, and from the fertilized eggs emerge the leptocephali, which then ride on currents all the way back to Europe.”