Chromis xouthos, a new species of damselfish (Pomacentridae) from the East Andaman Sea and Central Indian Ocean

Gerald R. Allen and Mark V. Erdmann

aqua, International Journal of Ichthyology, pp. 89-94, Volume 10, Issue 3 – October 2005

Chromis xouthos  is described from six specimens, 82.4-92.3 mm SL, collected at Pulau Weh, Aceh Province, Sumatra, Indonesia at a depth of 25 m. Diagnostic features include: XIII,12 dorsal rays; II,11 (rarely 12) anal rays; 19 (rarely 18) pectoral rays; 3 spiniform caudal rays; 16-17 tubed lateral line scales; 6-7+19-21 (total, 26-28) gill rakers on the first branchial arch; body depth 1.9-2.0 in SL; and colour in life mainly golden brown with a yellowish caudal fin and pale bluish-grey pelvic fins. It appears to be closely related to C. pembae of the western Indian Ocean and Red Sea, but exhibits apparent modal differences in the number of total gill rakers on the first branchial arch, tubed lateral line scales, and pectoral rays. The two species share similar colour patterns, although C. xouthos is overall golden brown compared with the dark brown ground colour of C. pembae.

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