dorsal organ

From ZooTerms (Dictionary of Invertebrate Zoology)
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dorsal organ: 1. (Annelida: Polychaeta) In Orbiniida and Spionida, ciliated sensory tubercles, ridges, or bands located on the dorsal surface of the segments. See also lateral organs.

2. (Arthropoda: Crustacea) Thickened glandular area of hypoderm on the dorsal surface in the posterior or anterior part of the cephalon.

3. (Arthropoda: Insecta) A distinct mass of cells in the dorsal part of an embryo.