Lisher Mark W, Viana Sarah T F L, Gon Ofer
Department of Collections & Digitization, Iziko Museums of South Africa, Cape Town, South Africa.
Department of Biological Sciences, University of Cape Town, Cape Town, South Africa.
J Fish Biol. 2025 Apr;106(4):1012-1020. doi: 10.1111/jfb.16013. Epub 2024 Dec 4.
Chromis tweddlei, a new species of damselfish, is described from seven specimens, 88.8-111.1 mm standard length (SL), collected during a 2008 expedition by the R.V. Dr. Fridtjof Nansen at 214-219 m depth (an unusually deep occurrence for the genus) on the Cargados Carajos Bank, Mascarene Plateau, southwestern Indian Ocean. Chromis tweddlei sp. nov. closely resembles Chromis axillaris, Chromis pelloura, and Chromis woodsi, the only congeners occurring in the western Indian Ocean (WIO) that share the character of having 14 dorsal-fin spines and a dark caudal band. Chromis tweddlei sp. nov. can be distinguished from its regional congeners by having II,13-14 anal-fin rays, 19-20 pectoral-fin rays, 18-19 tubed lateral-line scales, 4 scales above lateral line to the origin of dorsal fin, 29-32 total gill rakers, and colouration, including a caudal band that tapers anteriorly the full length of the caudal peduncle. A key to the 14 dorsal-fin spine species of Chromis from the WIO is provided.
特氏光鳃鱼（Chromis tweddlei），一种新的雀鲷，依据2008年由“弗里德乔夫·南森博士”号科考船在印度洋西南部马斯克林高原的卡加多斯·卡拉若斯浅滩214 - 219米深度（该属鱼类在此深度出现异常之深）采集的7个标本（标准体长88.8 - 111.1毫米）进行描述。特氏光鳃鱼新种与腋光鳃鱼（Chromis axillaris）、佩氏光鳃鱼（Chromis pelloura）和伍氏光鳃鱼（Chromis woodsi）非常相似，它们是印度洋西部仅有的同属物种，都具有14根背鳍棘和一条黑色尾带的特征。特氏光鳃鱼新种可通过以下特征与该区域的同属物种区分开来：有II，13 - 14根臀鳍鳍条、19 - 20根胸鳍鳍条、18 - 19片有管侧线鳞、背鳍起点上方侧线以上有4片鳞、鳃耙总数为29 - 32个，以及其体色，包括一条在尾柄全长上向前逐渐变细的尾带。文中还提供了印度洋西部14根背鳍棘的光鳃鱼属物种检索表。
