leptocephalus
noun
lep·to·ceph·a·lus
ˌlep-tə-ˈse-fə-ləs
plural leptocephali
ˌlep-tə-ˈse-fə-ˌlī
-ˌlē
: a long thin small-headed transparent pelagic first larva of various eels
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Merriam-Webster unabridged
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