Cryptocentrus nanus Greenfield & Allen, 2018
Blackdwarf shrimpgoby

Family:  Gobiidae (Gobies), subfamily: Gobiinae
Max. size:  2.21 cm SL (male/unsexed); 2.34 cm SL (female)
Environment:  benthopelagic; marine; depth range 8 - 11 m
Distribution:  Western Central Pacific: Fiji and possibly Palau.
Diagnosis:  Dorsal spines (total): 5-5; Dorsal soft rays (total): 10-10; Anal spines: 1-1; Anal soft rays: 8-9. This species is distinguished by the following characters: D IV-I,10; A I,8-9; pectoral-fin rays 16; scales in longitudinal series 65-81; predorsal scales 0-15; anterior scales cycloid, posterior scales ctenoid; anterior part of breast, prepelvic region, and pectoral-fin base are naked; head naked except on the side of nape and predorsal region, where scales extend anteriorly to about level of middle of operculum; body depth at pelvic-fin origin 4.4-5.2, mean 4.8; vomerine teeth present; gill opening extending forward to a vertical at posterior edge of preoperculum or slightly anterior; dorsal-fin spines progressively longer to fourth, longest 1.6-2.7 in HL; caudal fin rounded, 2.7-3.1 in HL; pectoral fins reaching level of anus or just beyond (3.7-4.7 in SL); pelvic fins reaching posteriorly to anus (3.6-4.3 in SL). Colouration: live individuals are black, fins are black with clear distal margins (Ref. 118501).
Biology:  Inhabitsf sand bottoms in 8.2-10.7 m depth and partners with an alpheid-shrimp which remains unidentified (deposited specimen CAS 244344). Adults mature at 2.34 cm SL or less (Ref. 118501).
IUCN Red List Status: Not Evaluated (N.E.) Ref. (130435)
Threat to humans:  harmless


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