Williams’s flapheaded goby (Callogobius williamsi) is a ray-finned fish of the family Gobiidae. It inhabits marine (saltwater) waters in reef-associated environments. This species can reach a maximum total length of 3.3 cm. It occurs at depths between 7 and 27 metres. With a trophic level of 3.1, it is a low-level carnivore, feeding on invertebrates and small organisms. It is assessed as Least Concern on the IUCN Red List.
Dorsal spines (total): 7; Dorsal soft rays (total): 9; Anal spines: 1; Anal soft rays: 6 - 7; Vertebrae: 26. This species is distinguished from its congeners by the following set of characters: most or all scales cycloid; ctenoid scales (if present) restricted to mid-lateral region of caudal peduncle; 23-26 (usually 24 or 25) scales in lateral series; presence of pelvic frenum; absence of preopercular papillae row (Row 20); interorbital canal present with pair of pores B?, single pore D, and pair of pores F? .: elongated.
Behavioural data for Williams’s flapheaded goby is currently being reviewed.
Diet information for Williams’s flapheaded goby is currently being compiled.
Reproduction data for Williams’s flapheaded goby is currently being compiled.
Marine; reef-associated; depth range 7 - 27 m . Tropical Central Pacific: Marquesas Is.
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