leptocephalus

noun
lep·​to·​ceph·​a·​lus | \ˌlep-tə-ˈse-fə-ləs \
plural leptocephali\ˌlep-​tə-​ˈse-​fə-​ˌlī, -​ˌlē \

Definition of leptocephalus 

: a long thin small-headed transparent pelagic first larva of various eels

First Known Use of leptocephalus

1769, in the meaning defined above

History and Etymology for leptocephalus

New Latin, from Greek leptos + kephalē head — more at cephalic

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The first known use of leptocephalus was in 1769

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