naupliar eye
Relatively simple, median eye, typically consisting of 3 photoreceptor units (up to 7 in taxa where it persists in the adult) and first appearing in the nauplius larval stage. Thought to be a primitive (defining) feature of the Crustacea; it is secondarily reduced or lost in many taxa [Brusca and Brusca, 2002].
Unpaired median eye found in naupliar larval stages and commonly in more mature stages as well. (Syn. median eye) [Moore and McCormick, 1969].
Unpaired median eye, common in nauplii and many adult crustaceans; structure simple, consisting of 1 to few light-sensitive cells. (Syn. median eye) [McLaughlin, 1980].
(Order Cladocera):
Small median photosensitive organ located ventrally on head between mouth and compound eye. (Syn. median eye, ocelus) [Stachowitsch, 1992].
(Order Notostraca):
Small median photosensitive organ located in front of compound eyes on sloping anterior of carapace; consists of four cups. (Syn. median eye) [Stachowitsch, 1992].
(Order Diplostraca):
Small median photosensitive organ located ventrally on rostrum of head. (See also compound eye). (Syn. median eye) [Stachowitsch, 1992].
(Order Anostraca):
Unpaired median photosensitive organ located somewhat posteriorly to antennules on anterior part of head; relatively small, consisting of three (two lateral, one ventral) cups. (See also compound eye) [Stachowitsch, 1992].
(Subclass Mystacocarida):
Ocellus [Stachowitsch, 1992].
(Class Ostracoda):
Single medial anterior eye, normally composed of 3 eye cups, has reflecting tapetal layer. (Syn. medial eye) [Cohen, Peterson, and Maddocks, in press].

Crustacea glossary. . 2011.

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