Loài cá Chuồn Đất Đuôi Bằng

Description. Dorsal-fin rays I + I + V + I, 8; anal-fin rays 6; pectoral-fin rays 28 / 28; pelvic-fin rays I, 4; body moderately elongate, body depth 4.1 in SL; scales strong, each with a distinct ridge, caudal peduncle posteriorly with scute-like scales; head length 3.4 in SL; upper surface of the head granular, concavity with irregular rows of granular ridges; interorbital space extremely wide, its width 4.4 (22.6 %) in SL, and concave, the depth of concavity 5 in head length; snout very short, wide and rounded, with granular projections arranged in rows, the snout length 6.1 in head length, distance from snout to margin of orbit 1.8 in interorbital width; projections on preorbitale and cheek in irregular rows, those on preorbitale more prominent; opercle and preopercle with irregular rows of scutes; eyes large, their diameter 2.4 in head length; mouth small, subterminal, and protractile; upper jaw largely obscured by bones surrounding eye, reaching to below center of pupil; jaws, palatines, and vomer with minute teeth; posttemporal spine well-developed, but flat against body, reaching to a vertical between bases of second and third dorsal-fin spines of continuous spinous part, the distance from snout to tip of spine 2.5 in SL; angle of preopercle with prominent spine reaching to level between bases of fourth and fifth dorsal spines of continuous spinous part, the distance from snout to tip of spine 2.0 in SL; ventral ridge of preopercular spine finely serrate; anterior two dorsal spines separated from remainder of spinous dorsal fin, first spine elongate, just behind “ V ” - shaped posterodorsal insertion of cranium, the spine subequal to the head length, its length 3.3 in SL, predorsal length 3.7 in SL; second dorsal fin spine shorter, a little closer to spinous portion than to the first spine, its length 8.2 in SL; last spine tiny, just before soft portion, lying on the end of scute; pectoral fins long, the length 1.2 in SL, reaching middle of caudal fin; pelvi