A new species of the congrid eel genus Ariosoma (Teleostei: Anguilliformes: Congridae) from the Southeast coast of India, Bay of Bengal

IF 1.1 4区生物学 Q3 MARINE & FRESHWATER BIOLOGY

Journal of the Marine Biological Association of the United Kingdom Pub Date : 2024-05-17 DOI:10.1017/s0025315424000420

Paramasivam Kodeeswaran, A. Kathirvelpandian, Anil Mohapatra, T. T. Ajith Kumar

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Abstract

A new species of congrid eel genus, Ariosoma is described here based on two mature female specimens collected from trawl by-catch landings at Thoothukudi fishing harbour, off Thoothukudi, Bay of Bengal. The new species can be easily distinguished from its congeners in having pre-anal length 48.7–49.1% TL; dorsal-fin origin just before pectoral-fin insertion; body bicoloured, pale brown dorsally and silvery white ventrally; preopercular portion dark; pectoral fin reddish with dark spot at the base; SO canal with six pores; pre-dorsal vertebrae 10–11; pre-anal vertebrae 61–64; total vertebrae 162–163. Further, the new species differs from all the congeners of Indian waters in having more total vertebrae, except A. albimaculatum (162–163 vs 129–153 in others; 161–164 in A. albimaculatum). The new species identity was also supported by molecular analyses using the mitochondrial COI gene and the result revealed that the new species is closely related to Ariosoma maurostigma and Ariosoma albimaculatum with a pair-wise genetic distance of 11.4% and 11.6% followed by A. melanospilos with 16.8%.

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来自印度孟加拉湾东南海岸的鳗鲡属新物种（Teleostei: Anguilliformes: Congridae)

本文描述了鳗鲡属（Ariosoma）的一个新物种，其依据是在孟加拉湾 Thoothukudi 附近的 Thoothukudi 渔港从拖网副渔获物中采集到的两个成熟雌性标本。新种的肛门前长度占总长度的 48.7-49.1%；背鳍起源正好在胸鳍插入之前；身体呈双色，背部为淡褐色，腹部为银白色；前胸部分为深色；胸鳍为淡红色，基部有黑斑；SO 管有 6 个孔；背前椎骨 10-11；肛门前椎骨 61-64；总椎骨 162-163。此外，该新种与印度水域的所有同属种都不同，除了 A. albimaculatum 外，该新种的总脊椎骨数更多（162-163 对其他同属种的 129-153；A. albimaculatum 的 161-164）。利用线粒体 COI 基因进行的分子分析也支持了该新物种的身份，结果显示该新物种与 Ariosoma maurostigma 和 Ariosoma albimaculatum 亲缘关系密切，成对遗传距离分别为 11.4% 和 11.6%，其次是 A. melanospilos，遗传距离为 16.8%。

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来源期刊

Journal of the Marine Biological Association of the United Kingdom 生物-海洋与淡水生物学

CiteScore

2.30

自引率

8.30%

发文量

审稿时长

3-8 weeks

期刊介绍： JMBA is an international journal, publishing original research on all aspects of marine biology. It includes pioneering work taking place today on major issues concerning marine organisms and their environment. Subjects covered include: ecological surveys and population studies of marine communities; physiology and experimental biology; taxonomy, morphology and life history of marine animals and plants; and chemical and physical oceanographic work. Included with 2010 online subscriptions: Marine Biodiversity Records.