zoeal

zo·e·a

Z0021250 (zō-ē′ə)n. pl. zo·e·ae (-ē′ē) or zo·e·as A larval form of crabs and certain other decapod crustaceans, characterized by thoracic appendages used for swimming and often one or more spines on the carapace.
[New Latin, from Greek zōē, life; see azo-.]
zo·e′al adj.

zoeal

(zəʊˈiːəl) adj (Zoology) denoting a larval stage of crabs and related crustaceans, during which there are spines on the body and the limbs are not fully developed