The Leptocephalus (which means slim head) is actually a the flat and transparent larva of the eel, marine eels, and other members of the Superorder Elopomorpha.

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The group evolved in the Cretaceous, 140 million years ago, and they all have laterally compressed bodies that contain transparent jelly-like substances on the inside of the body and a thin layer of muscle with visible myomeres on the outside.