New Species of Scorpionfish, Scorpaena cocosensis (Scorpaeniformes: Scorpaenidae) from the Cocos Islands, Costa Rica, Eastern Pacific Ocean
New Species of Scorpionfish, Scorpaena cocosensis (Scorpaeniformes: Scorpaenidae) from the Cocos Islands, Costa Rica, Eastern Pacific Ocean
复制标题
东太平洋科科斯群岛、哥斯达黎加的蝎子鱼新种，Scorpaena cocosensis（鲉形目：鲉科）
作者：
H. Motomura
本文描述了采自东太平洋哥斯达黎加科科斯群岛努埃兹岛近海的一种新的小型蝎鱼--科科斯蝎（Scorpaena cocosensis）。这个新物种与东太平洋的两种Scorpaena，Scorpaena russula和Scorpaena sonorae相似，在整体身体外观和缺乏补充的前鳃盖棘。但它与这两种的区别在于：背鳍有8条软鳍条，前腹体表鳞片外露，眶间嵴发达，从鼻棘后面开始，背侧观时向前和向后分叉，额侧缘背侧观时向后分叉，上颞后棘朝上，上颞后棘朝下，上颞后棘朝上，上颞后棘朝下，上颞后棘朝上。上颌骨后缘刚好与瞳孔后缘齐平;胸鳍后尖与第三背鳍软条起点齐平;头长较大（48.8%SL）;眼眶直径大（16.9%SL）;眼上棘基底之间的眶间隙宽（9.2%SL）。
Abstract A new species of small-sized scorpionfish, Scorpaena cocosensis, is described on the basis of a single specimen collected from off Nuez Island, Cocos Islands, Costa Rica, eastern Pacific Ocean. The new species is similar to two eastern Pacific species of Scorpaena, Scorpaena russula and Scorpaena sonorae, in overall body appearance and in lacking a supplemental preopercular spine. However, it is distinguished from these two species by the following characters: eight dorsal-fin soft rays; well-exposed scales covering anteroventral body surface; interorbital ridges well developed, beginning just behind nasal spines, diverging anteriorly and posteriorly in dorsal view; lateral margins of frontal diverging posteriorly in dorsal view; upper posttemporal spine directed upward; posterior margin of maxilla just reaching level with posterior margin of pupil; posterior tip of pectoral fin reaching level with origin of third dorsal-fin soft ray; large head length (48.8% SL); large orbit diameter (16.9% SL); wide interorbital space between supraocular spine bases (9.2% SL).