the larval stage of a lamprey.
Also, ammocoete.

1855–60; < Neo-Latin ammocoetes literally, something bedded in sand < Greek ámmo(s) sand + koítē bed Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ammocoete (ˈæməˌsiːt)
the larva of primitive jawless vertebrates, such as the lamprey, that lives buried in mud and feeds on microorganisms
[C19: from New Latin ammocoeteēs, literally: that lie in sand, from Greek ammos sand + koitē bed, from keisthai to lie]

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