William'S Triplefin

Very small supraorbital tentacle; in females, first dorsal fin shorter by half than second dorsal fin; in males, about two-thirds; male coloration dark gray with light gray mottling and a thin whitish bar below the eye; oblique suborbital blue streak observed in large males; fins translucent, mottled, and with gray spots; females comparatively pale and anteriorly bearing 2 indistinct, dark double bars that join below lateral line. Dorsal rays III + XI-XIV + 7-10; lateral line interrupted, 14-20 + 15-21; mandibular pores 2-3 + 1-2 + 2-3 (Ref. 54980).

Dorsal spines (total): 14 - 17; Dorsal soft rays (total): 7 - 10; Analspines: 1; Analsoft rays: 16 - 20

Adults are found on rocky shores exposed to surge (Ref.54980).

Enneapterygius williamsi, known commonly as the William's triplefin, is a species of triplefin blenny in the genus Enneapterygius. It was described by Ronald Fricke in 1997. Its specific name honours the collector of the type, the ichthyologist Jeffrey T. Williams of the Smithsonian Institution.