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.
Marine; reef-associated; depth range 7 - 27 m . Tropical Central Pacific: Marquesas Is.
The following diseases are known to affect Williams’s flapheaded goby.
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