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Manca

In isopods and certain other Peracarida, one of the first three stages or instars of the postmarsupial life cycle, wherein the seventh pereopod is absent or rudimentary. In some janiorideans (e.g. Lipomera) this condition is retained in the adult; for these taxa, the manca stage can not be identified by an absence of the last pereopod. [Wilson, 1989]
Prejuvenile hatching stage lacking the last pair of thoracopods in peracarids. [Brusca and Brusca, 2002]
Young of some Peracarida (e.g., Isopoda, Tanaidacea, Cumacea) in which last thoracopod is lacking. [Moore and McCormick, 1969]
Young of some Peracarida lacking last thoracopod at time of release from marsupium. [McLaughlin, 1980]
(Taxon-specific: Order Cumacea) First larval stage after release from brood pouch (marsupium). Resembles adult, yet lacks last (fifth) pair of pereopods. [Stachowitsch, 1992]
(Taxon-specific: Order Tanaidacea) Larval stage at which tanaidaceans are released from brood pouch (marsupium). Consists of several substages. [Stachowitsch, 1992]
(Taxon-specific: Order Isopoda) First free-living larval stage after release from brood pouch (marsupium). Resembles adult, yet characterized by lack of last (= seventh) pair of pereopods. [Stachowitsch, 1992]
(Taxon-specific: Order Isopoda) Young of most peracarids (including isopods), lacking last (eighth) thoracic appendages at time of release from broodpouch. [Wetzer et al. 1997]
(Taxon-specific: Order Isopoda) Young of some peracaridean crustaceans (including isopods), lacking last thoracic appendage at time of release from broodpouch. [Kensley and Schotte, 1989]
(Taxon-specific: Order Thermosbaenacea) In certain thermosbaenaceans, stage at which larva is released from brood pouch. Lacks last two pairs (seventh and eighth) of thoracopods and pleopods. [Stachowitsch, 1992]