A new species of Muraenichthys (Anguilliformes: Ophichthidae) from the Indo-Pacific, with revised generic diagnosis
A new species of Muraenichthys (Anguilliformes: Ophichthidae) from the Indo-Pacific, with revised generic diagnosis
复制标题
来自印度-太平洋地区的一种新种鳗鲡鱼（鳗鱼目：蛇尾科），经过修订的一般诊断
作者：
Hibino;Y. and Kimura;S.
根据采自台湾、菲律宾、澳大利亚东北部、瓦努阿图和斯里兰卡的五个标本（总长 97.9-281.0 毫米）描述了一种新的蠕虫鳗（Ophichthidae，Myrophinae）Muraenichthys velinasalis。长尾鳅与菲律宾鳅和舒尔茨鲆最为相似，其背鳍起点位于肛门中部垂直后方，但可以通过后鼻孔的状况、鳅鳅的独特特征以及上颌最内排牙齿的形状（相对粗壮且略尖，相对于上颌最内排牙齿的形状）与后两个物种轻松区分。细长和尖锐），上颌牙齿的排列（菲律宾M. philippinensis中不规则双列前部和单列后部与完全单列，M. schultzei中双列或三列），以及更多或更少的肛前和总椎骨（M. philippinensis中44-51对59-60，M. schultzei中42-47）。 schultzei；M. philippinensis 136-139 vs. 128-130，M. schultzei 119-128）。 Muraenichthys 属根据所有当前有效物种通过以下特征组合重新定义：眼睛位于中颌之前；后鼻孔的内孔位于上唇上方，外孔通常在嘴的外侧，前面有一个突出但短的突出瓣；前鼻孔和后鼻孔之间有一个孔；三个前鳃孔；颌骨、犁骨和颌间区域的牙齿；牙齿形状可变，从钝到尖，但不明显下弯，牙齿长度等于或小于眼睛直径的一半；颌骨和犁骨上的牙齿排列成一到五排；鳃孔收缩，高度<眼径的170%；胸鳍缺失。
A new worm eel (Ophichthidae, Myrophinae), Muraenichthys velinasalis, is described based on five specimens (97.9–281.0 mm of total length) collected from Taiwan, Philippines, northeastern Australia, Vanuatu, and Sri Lanka. Muranichthys velinasalis is most similar to M. philippinensis and M. schultzei in the position of the dorsal-fin origin behind a vertical through mid-anus, but can be easily distinguished from the latter two species by the condition of the posterior nostril, unique character of M. velinasalis within Muraenichthys, and by the shape of the teeth on the innermost row of the upper jaw (relatively robust and slightly pointed vs. slender and pointed), arrangement of upper-jaw teeth (irregularly biserial anteriorly and uniserial posteriorly vs. completely uniserial in M. philippinensis, biserial or triserial in M. schultzei), and its more numerous or fewer preanal and total vertebrae (44–51 vs. 59–60 in M. philippinensis, 42–47 in M. schultzei; 136–139 vs. 128–130 in M. philippinensis, 119–128 in M. schultzei). The genus Muraenichthys is re-defined based on all currently valid species by the following combination of characters: eyes located anterior to mid-jaw; inner hole of posterior nostril above upper lip, and outer hole usually outside of mouth, with a prominent but short projected flap anteriorly; a single pore between anterior and posterior nostrils; three preopercular pores; teeth on jaws, vomer, and intermaxillary area; tooth shape variable, blunt to pointed but not distinctly recurved and tooth length equal or less than a half of eye diameter; teeth on jaws and vomer arranged in one to five rows; gill opening constricted, its height< 170% of eye diameter; pectoral fins absent.