Bathygobius cyclopterus (Valenciennes, 1837)
Spotted frillgoby
Bia
Bathygobius cyclopterus
photo by Randall, J.E.

Family:  Gobiidae (Gobies), subfamily: Gobiinae
Max. size:  7.5 cm TL (male/unsexed)
Environment:  reef-associated; brackish; marine; depth range 0 - 20 m
Distribution:  Indo-Pacific: East Africa to Samoa and the Hawaiian Islands.
Diagnosis:  Dorsal spines (total): 7-7; Dorsal soft rays (total): 9-9; Anal spines: 1-1; Anal soft rays: 8-8. Brown with irregular spots; dorsal and caudal fins with bands in females, dusky in males; often with dark brown saddle below each of the dorsal fins (Ref. 2798); characterized further by having upper five pectoral rays with free tips and sixth ray partly free; three branches on upper four pectoral rays; rounded caudal fin; longitudinal scale series 37-38; predorsal scales 18-20, reaching or nearly reaching interorbital space; cheek and opercle without scales; presence of fleshy double flap from edge of cheek into notch at posterior end of upper lip; ctenoid body scales, becoming cycloid on abdomen, breast, base of pectoral fin and nape; depressed head, width greater than depth; depth of body 4.3-5.5 in SL (Ref. 90102).
Biology:  Inhabits intertidal seaward reef flats (Ref. 37816, 48637). Also found in shallow reefs near shore (Ref. 90102).
IUCN Red List Status: Least Concern (LC); Date assessed: 20 June 2017 Ref. (130435)
Threat to humans:  harmless
Country info:  Specimens were collected from Calbiga-a creek, Leyte in 1993 (Ref. 7223). Also known from the type localities of Bathygobius laoe Roxas & Ablan, 1940 from Dagupan, Pangasinan Province (BSMP 31948, destroyed in WWII) and Mapo mearnsi Evermann & Seale, 1906 from Zamboanga Province (USNM 55624, 1 of 3) (Ref. 280). Also Ref. 7050, 9360.


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