Sphinx Blenny

Overview

The Sphinx Blenny (Aidablennius sphynx) is a small, subtropical combtooth blenny and the sole member of its genus. It is a common resident of shallow, sunlit coastal waters, often observed resting in rocky crevices or on algae-covered surfaces.

Distribution & habitat

This species is found in the Mediterranean and Black Seas, as well as along the eastern Atlantic coast near Morocco. It thrives in the littoral zone, typically at depths of less than 4 meters, where it favors rocky substrates and horizontal terraces rich in algae.

Appearance

Reaching a maximum length of about 8 cm, the Sphinx Blenny has an elongated, laterally compressed body without scales. Its head features a steep profile and a pair of simple, short tentacles above the eyes, which are more prominent in males. The body color varies from beige to dark brown, marked by 5 to 7 dark vertical bands often edged in blue or white. Males are distinguished by a rectangular, red-rimmed blue spot behind the eye and characteristic blue markings on the cheeks, including an inverted "V" shape under the eye.

Biology & behavior

Sphinx Blennies are diurnal, solitary, and territorial fish. They are primarily herbivorous, grazing on benthic algae, though they also consume small invertebrates. During the breeding season, which spans from spring through late summer, males establish and defend nests in small cavities. Females lay adhesive eggs within these burrows, which the male then guards and tends to until they hatch. Males have been observed occasionally consuming eggs, a behavior thought to be linked to limited feeding opportunities while they are restricted to their nesting sites.