The manca (plural: mancae) are post-larval juveniles in some crustaceans. The manca stage is the defining characteristic of a clade called Mancoida which comprises all the member of the Peracarida except the Amphipoda. Mancae closely resemble the adult form, but for the absence of the last pair of pereiopods. In some isopods, specifically the fami... Found on http://en.wikipedia.org/wiki/Manca