POMACENTRIDAE Chromis dimidiatus, 4.5 cm SL (photo by Richard Winterbottom) Chromis dimidiatus (Kluzinger, 1871) Twotone Chromis D XII, 11-12; A II, 12; P1 15-17; LLp 14-16. Body deep and compressed. Posterior margin of preopercle smooth. Suborbital scaled, with entire ventral free edge. Teeth on jaws conical, muliserial; teeth of outermost row larger than those of inner rows. Caudal fin forked; two conspicuous projecting spine-like rays at upper and lower edges of caudal-fin base. Color: head, anterior half of body and dorsal fin, and pelvic fin dark blackish brown, abruptly white on the rest of body and dorsal fin, and anal and caudal fins; a half-moon shaped black blotch covering pectoral-fin base and axil. Size: 5.5 cm SL. Distribution: Indian Ocean, Andaman Sea and western Indonesia (Java and Sumatra). Remarks: found in shallow coral reefs.