Definitions

Nuchal organ

• Sense organ on upper side of head in many branchiopods.
  (syn. neck organ) [Moore and McCormick, 1969]
• Sense organ on upper side of cephalon.
  (syn. neck organ) [McLaughlin, 1980]
• (Taxon-specific: ) Frontal organ. [Stachowitsch, 1992]
• Dorsal organ. [Stachowitsch, 1992]
• (Taxon-specific: Family Pycnogonidae) Unpaired median sensory organ located on dorsal surface of head; visible beneath cuticle.
  (syn. neck organ) [Stachowitsch, 1992]
• (Taxon-specific: Family Cyatholaimidae) Organ associated with specialised areas of modified integument, possibly with osmoregulatory function, typical of fresh and brackish water taxa. [Boxshall and Halsey, 2004]

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Citing this glossary: For individual definitions, please cite the specific author(s) of the definition.
To cite the glossary as a whole, please use:
Martin, J.W., N.D. Pentcheff, D. Striley, C. Perrodin, A.R. Wall, J. Wall, and J. Zieba (editors). Crustacea Glossary. Crustacea Department, Natural History Museum of Los Angeles County. Accessed: 31 Oct 2025. URL: https://research.nhm.org/glossary