Definitions

A larva with natatory exopods on some or all thoracic appendages, but with pleopods absent or rudimentary. [Ingle, 1983]
Free-living larval stage, following protozoea, present in all shrimps. [Butler, T. H.]
Larval stage characterized by natatory exopods on some or all thoracic appendages, pleopods absent or rudimentary.
(syn. mysis, phyllosome, protozoea, schizopod larva) [McLaughlin, 1980]
Larval stage characterized by the presence of natatory exopods on some or all of the thoracic appendages and by pleopods being absent or rudimentary. [Brusca and Brusca, 2002]
One of several larval stages, first stage hatching from the egg; transforming to final megalopa stage. [Poore, 2004]
(Taxon-specific: Order Decapoda) Fourth of basically five larval stages (nauplius, metanauplius, protozoea, zoea, postlarva). If hatched from egg and free-swimming, then with thoracopodal locomotion. According to group this stage may be termed acanthosoma, mysis, phyllosoma, or puerulus. [Stachowitsch, 1992]