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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]
(Taxon-specific: Order Cladocera) Small median photosensitive organ located ventrally on head between mouth and compound eye.
(syn. median eye, ocelus) [Stachowitsch, 1992]
(Taxon-specific: 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]
(Taxon-specific: Order Diplostraca) Small median photosensitive organ located ventrally on rostrum of head. (See also compound eye).
(syn. median eye) [Stachowitsch, 1992]
(Taxon-specific: 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]
(Taxon-specific: Subclass Mystacocarida) Ocellus. [Stachowitsch, 1992]
(Taxon-specific: 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]