dorsal organ

dorsal organ
Poorly understood glandular-sensory structures (actually several different structures that may or may not be homologous) on the head of many crustaceans [Brusca and Brusca, 2002].
Thickened glandular area of hypoderm of dorsal surface just behind head in various branchiopods, isopods, amphipods, mysidaceans, tanaidaceans, and syncarids, its function obscure [Moore and McCormick, 1969].
Thickened glandular area of hypoderm on dorsal surface, usually in posterior of cephalon, sometimes in anterior part; not homologous in all taxa [McLaughlin, 1980].
(Order Notostraca):
Unpaired organ of unknown function located behind compound eyes on dorsal surface of carapace. (considerably behind eye tubercles, anterior part between eye tubercles; circular, somewhat triangular). (Syn. nuchal organ) [Stachowitsch, 1992].

Crustacea glossary. . 2011.

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