Definitions

X-organ

• Groups of neurosecretory cells situated in each eyestalk producing a moult-inhibiting hormone. [Ingle, 1983]
• Site of secretion of molt-inhibiting and other hormones. Located in eyestalks of most decapods or cephalon of sessile-eyed crustaceans. Also referred to as paired frontal organ in Anostraca. [McLaughlin, 1980]
• (Taxon-specific: Order Anostraca) Neurosecretory structure in dorsal region of head; innervated by brain. [Stachowitsch, 1992]
• (Taxon-specific: Order Decapoda) Neurosecretory structure in eyestalk (ocular peduncle). Secretes hormones that inhibit molting and are involved in gonad development and metabolism. In shrimp-like (natantian) decapod one may distinguish medulla terminalis X-organ and sensory pore X-organ. [Stachowitsch, 1992]

---

 Copyright NHMLAC    Design: Dean Pentcheff pentcheff@gmail.com
 
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: 8 Nov 2024. URL: https://research.nhm.org/glossary