Istiblennius dussumieri

Habitat. The specimen was collected from a rocky intertidal tidepool at a depth of approximately 0.2 – 0.3 m.

Sumber: New records of six combtooth blennies in the genera Blenniella, Cirripectes, Istiblennius, and Salarias (Perciformes: Blenniidae) from Taiping Island, South China Sea

Description. Dorsal-fin rays XIII, 21; anal-fin rays II, 22; pectoral-fin rays 14; pelvic-fin rays I, 4; segment caudal-fin rays 6 + 5 (branched 5 + 4); vertebrae 11 + 25; no nuchal cirri; supraorbital cirri 1 (both side); no nasal cirri; lateral line tubes 19 (both side). Morphometric data are presented in Table 1. The body is elongate, moderately compressed posteriorly, and deepest at the base of the pectoral fin. The dorsal profile from the anterior margin of the eye to the snout is gently rounded, then rises slightly toward the nape and the origin of the first dorsal fin, gradually descending toward the caudal peduncle, and slightly arching posteriorly. The ventral profile is slightly convex from the tip of the lower jaw to the pelvic-fin origin, and thereafter nearly straight and parallel to the body axis toward the anus, rising slightly along the anal-fin base and gently arching again before reaching the caudal peduncle. The anus is located slightly anterior to mid-body. The head is bluntly rounded and widest across the mid-cheek region; the eye is moderately sized and positioned anterodorsally. The nuchal cirri are arranged in two separated clusters at the midpoint of the nape. A complex cephalic sensory pore system is present. The posterior dorsal-fin rays are separated from the fin base, and the posteriormost membrane does not attach to the caudal peduncle. The anal-fin base extends from a point below the 12 th dorsal-fin spine to a point below the posterior end of the dorsal-fin base, and the posteriormost anal-fin ray is split from its base. The caudal fin is arcuate. The pectoral-fin origin lies below the first dorsal-fin spine, and the ventralmost pectoral-fin base is positioned below the second dorsal-fin spine; the longest ray reaches the level of the second anal-fin spine, and the posterior fin margin is rounded. The pelvic-fin origin is anterior to the vertical level of the nuchal cirri, and the fin reaches to the level below the third dorsal-fin spine. The general body coloration consists of alternating grayish white and light brown. The head bears several irregular black spots and streaks, and faint light brown stripes are present around the eyes, which appear whitish. The first and second dorsal fins display alternating grayish white and light brown bands. The anal fin is white with several black spots. The pectoral fin is semi-transparent white with several semi-transparent black spots. The pelvic fin is white. The caudal-fin rays are semi-transparent white, while the membrane is semi-transparent black with a single longitudinal white stripe medially.

Sumber: New records of six combtooth blennies in the genera Blenniella, Cirripectes, Istiblennius, and Salarias (Perciformes: Blenniidae) from Taiping Island, South China Sea