Abstract

A new barbeled dragonfish, Eustomias shunyo sp. nov., is described based on three specimens [219.1–256.4 mm in standard length (SL)] collected at depths of 30–180 m from the Shatsky Rise in the western North Pacific. The new species is included in the subgenus Urostomias Regan and Trewavas 1930 and distinguishable from all congeners by the following combination of characters: 30 dorsal-fin rays; 48–49 anal-fin rays; 9–10 pectoral-fin rays; 7 pelvic-fin rays; 29–31 PV (photophores in ventral series between pectoral- and pelvic-fin insertions); 26–27 AC (photophores from dorsal to anal fin to end of row); 69–72 vertebrae; preanal length 63.7–65.3% SL; head length 9.7–10.1% SL; barbel length 12.2–13.7% SL; single luminous gland on upper margin of caudal fin; stem of barbel lacking external pigmentation except for its proximal portion, and melanophores sparsely scattered around small photophores on ventral side of stem; pale yellow patches arranged in 1 or 2 rows on dorsal and ventral sides of barbel stem; single or pared filaments on dorsal side of distal portion of barbel stem just before terminal bulb; single leaf-shaped dark patch on ventral side of barbel bulb. The revised diagnosis and a key to species of the subgenus Urostomias are presented.

中文翻译：

---

Eustomias shunyo，来自北太平洋西部的有须龙鱼（Stomiiformes，Stomiidae）新种

摘要

一种新的有须龙鱼，Eustomias shunyo sp. 11 月，基于在北太平洋西部沙茨基海隆 30-180 m 深度采集的三个样本 [标准长度 (SL) 219.1-256.4 mm] 进行描述。新物种被纳入尿口亚属Regan 和 Trewavas 1930，通过以下特征组合与所有同类区分开来： 30 条背鳍条；48–49 臀鳍条；9-10条胸鳍条；7条腹鳍条；29-31 PV（胸鳍和腹鳍插入之间的腹侧系列发光）；26–27 AC（从背鳍到臀鳍到行尾的发光）；69–72 块椎骨；肛前长度 63.7–65.3% SL；头部长度 9.7–10.1% SL；触须长度 12.2–13.7% SL；尾鳍上缘有单个发光腺体；触须的茎除了近端部分外没有外部色素沉着，黑色素细胞稀疏地散布在茎腹侧的小发光体周围；触须茎的背侧和腹侧有排列成1或2列的淡黄色斑块；在触须茎远端部分的背侧，就在终球之前，有单根或稀疏的细丝；触须球腹侧有单叶形暗斑。修订后的诊断和亚属物种的关键出现尿道口瘤。