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(invertebrate zoology)
A larval stage characteristic of many groups of Crustacea; the oval, unsegmented body has three pairs of appendages: uniramous antennules, biramous antennae, and mandibles.



the plankton larva of numerous species of the family Crustacea. The body is unsegmented and has three pairs of appendages. In front of the mouth there are uniramous sensory antennules; in back there are biramous antennae and mandibles for swimming. The nauplius has a median eye. Between the mandibles and the anal opening there is a growth zone, where, as development progresses, the postnauplial segments with appendages develop.

References in periodicals archive ?
finmarchicus, there is little to no opsin expression in embryos, and the highest expressions were observed in naupliar and early copepodite developmental stages.
The lengths of entire naupliar exuviae were measured from the anterior mid-dorsal margin to the base of the caudal spines, and lengths from the anterior to mid-dorsal posterior margins of the prosome were measured for all copepodite exuviae.
During the naupliar (N1-N5) stages, larvae were not fed because differentiation of the digestive tract is incomplete and the yolk sac is the source of nutrition.
1989) reared Metapenaeopsis palmensis (Haswell) in the laboratory and described all the larval stages of the species except the naupliar stages.
Naupliar density and adult density were significantly greater in the 0% treatment than the 50% and 75% treatments.
In this way, eggs can hatch and naupliar stages can survive in small-scale hatcheries located on the coast.
The relationship between egg size and naupliar size in the calanoid copepod Diaptomus claviceps Schacht.
The outcome is a planktonic larva that metamorphoses through five naupliar, three protozoean, and three mysis stages, before reaching the semibenthic postlarval stage.
1994) and quality (Moyse 1963) of food available to the feeding naupliar stages that precede the nonfeeding cyprid stage.
Table 1 Description of embryo stages of Callinectes sapidus Elapsed Time Stage Description (hours at 27[degrees]C) 1 Fertilization 0 2 Early cleavage; morula 12 (random mass of yolk cells) 3 Late cleavage; blastula 36 (mass of undifferentiated yolk cells) 4 Embryonic naupliar stage; 85 transparent embryo above the yolk 5 Early appendage fomation; 110 embryo invading ventral portion of yolk 6 Embryonic eye; eye appears 160 as scarlet crescent; elongating appendages 7 Presence of beating heart; 180 pigmented appendages 8 Oval, pigmented eye; 50% 210 of yolk utilized; clear appendages 9 Compound eye with dark 230 pigmentation; only small amounts of yolk 10 Protozoeae stage ready 280 for hatching into free-swimming zoea
We conclude that the naupliar epidermis does not present a significant barrier to compounds of molecular weight below about 800 and th at substances such as [H.