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24(1)_Chromis torquata

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Volume 24, Issue 1 – 05 June 2018

Gerald R. Allen: Chromis torquata, a new species of damselfish (Pomacentridae) from Mauritius and Réunion, pp. 15-22

 

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SINGLE PAPER

Volume 24, Issue 1 – 05 June 2018

Gerald R. Allen: Chromis torquata, a new species of damselfish (Pomacentridae) from Mauritius and Réunion, pp. 15-22

Abstract

A new species of pomacentrid fish, Chromis torquata, is described from six specimens, 22.0-91.9 mm SL collected in 30 m at Mauritius in the southwestern Indian Ocean. It also occurs at nearby Réunion, based on photographic evidence. The new species belongs to the C. xanthura complex, which also contains C. anadema (Japan and Micronesia to Marquesas and Pitcairn Island), C. opercularis (East Africa to Christmas Island, Indian Ocean), and C. xanthura (Indonesia to Japan, eastward to Fiji and Tonga). Diagnostic features for the new species include usual counts of XIII, 11 dorsal rays, II, 11 anal rays, 19 pectoral rays, 3 spiniform caudal rays, 17-19 tubed lateral-line scales, and a distinctive colour pattern that includes a broad dark band immediately behind the head, extending downward to the body side of the pectoral-fin axil. The maximum width of the dark band is equal to or greater than the horizontal eye diameter in C. torquata, but the similarly-positioned band of the other species in the complex is clearly less than the eye diameter. The new species also differs in having the entire iris orange-yellow compared with a narrow rim of yellow around the pupil in the other three species.