Class: Ophiuroidea Gray, 1840
Order: Amphilepidida O’Hara, Hugall, Thuy, Stöhr & Martynov, 2017
Family: Hemieuryalidae Verrill, 1899
Ophioplocus declinans (Koehler, 1904)
Collection: Andaman & Nicobar Islands — Off Kamorta Island, 8° 21.91’ N, 93° 34.37’ E, 71 m (FORVSS388, St.12), 13.08.2019, dredge, 1 specimen.
Voucher No.: CMLRE IO/SS/ECD/00244.
Description: Disc pentagonal, arms 4-5 times disc diameter. Disc scales large, polygonal or rounded, arranged irregularly; scales, oral shield, adoral shield and oral plate, as well as dorsal, ventral and lateral arm plates strongly beaded. Radial shields small, triangular to oval, separated by a row of 2–3 transversely wide disc scales; a pair of rounded disc scales distal to the radial shields, between which the first dorsal arm plate is wedged. Four conical, pointed papillae on each side of the jaw. Arm spines numbering four; conical, short, less than half the segment in length; subequal, the ventral-most slightly longer and stouter. Preserved specimen grey overall with darker and lighter patches on the disc dorsally.
Biological association: None.
Remarks: The single specimen collected from the Nicobar Islands is a juvenile, indicated by the smaller size and arrangement as well as relative development of skeletal elements.
Distribution: India: Andaman & Nicobar Islands, Indonesia, north-western Australia, Philippines, Papua New Guinea; 30–400 m.
Identified by: Usha V. Parameswaran
Publication: Parameswaran U. V., Gopal A., Abdul Jaleel K. U., Saravanane N. 2021. Nine new records of brittle stars (Echinodermata: Ophiuroidea) from Indian waters. Marine Biology Research, 17(5-6): 434-453. DOI: 10.1080/17451000.2021.1967995.