Chelidoperca pulchella and C. pollux, two new perchlet species (Serranidae) from the northwestern Pacific Ocean

IF 0.6 4区生物学 Q4 FISHERIES Ichthyological Research Pub Date : 2024-03-02 DOI:10.1007/s10228-024-00952-6

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Abstract

Two new perchlet species (Perciformes: Serranidae), Chelidoperca pulchella [3 specimens, 58.8–70.4 mm standard length (SL)] and Chelidoperca pollux (3 specimens, 68.1–72.3 mm SL), are described from Okinawa Island, Ryukyu Islands, Japan and Nha Trang Bay, Vietnam, respectively. Both new species are morphologically similar to Chelidoperca flavimacula Psomadakis, Gon and Htut 2021, described from the northern Andaman Sea, but can be readily distinguished from other congeners by the presence of many yellow spots on the anal fin, and three [2 full-sized and 1 (uppermost) half-sized] scales from the dorsal-fin base mid-point to the lateral line. However, the former differ primarily from C. flavimacula in having fewer yellow spots on the anal fin (2 or 3 spots on each membrane between the 3rd to 6th soft rays in the new species vs. 3 or 4 in C. flavimacula), and a single row of mandibular scales extending anteriorly from the angular onto the ventral surface of the dentary (vs. scales restricted to the angular in C. flavimacula). Chelidoperca pulchella is readily distinguished from C. pollux, the former having interorbital scales extending anteriorly beyond the mid-orbit (vs. ending at the mid-orbit), a deeper body (depth at pelvic-fin origin 25.8–26.4% of SL vs. 23.5–24.1% of SL), longer head (length 39.0–39.4% of SL vs. 35.6–36.3% of SL), larger eyes (orbit diameter 13.5–14.1% of SL vs. 11.0–11.7% of SL), and longer pectoral fins (length 27.8–29.8% of SL vs. 24.7–26.4% of SL). Since mitochondrial COI sequences from the type specimens of C. pulchella closely matched that of a specimen from the Philippines, the species may have a widespread distribution on the upper continental slope from the Ryukyu Islands to the Philippines.

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来自西北太平洋的两个鲈鱼新物种（鮨科）Chelidoperca pulchella 和 C. pollux

摘要本文描述了分别产自日本琉球群岛冲绳岛和越南芽庄湾的两个鲈形目（鲈形目：鮨科）新物种：Chelidoperca pulchella [3条标本，58.8-70.4毫米标准长度（SL）] 和 Chelidoperca pollux [3条标本，68.1-72.3毫米标准长度（SL）]。这两个新种与安达曼海北部的 Chelidoperca flavimacula Psomadakis, Gon 和 Htut 2021 在形态上相似，但由于臀鳍上有许多黄色斑点，且从背鳍基部中点到侧线有 3 个[2 个全尺寸和 1 个（最上部）半尺寸]鳞片，因此很容易与其他同系物种区分开来。然而，前者与 C. flavimacula 的主要区别在于臀鳍上的黄斑较少（在新种中，第 3 至第 6 软棘之间的每层膜上有 2 或 3 个黄斑，而在 C. flavimacula 中则有 3 或 4 个），并且有一排下颌鳞片从角部向前方延伸至齿状体的腹面（而 C. flavimacula 的鳞片仅限于角部）。Chelidoperca pulchella 很容易与 C. pollux 区分开来，前者的眶间鳞片向前方延伸到眶中部以外（而 C. pollux 的鳞片则止于眶中部），身体较深（盆鳍起源处的深度为单鳍长的 25.8-26.4% vs. 单鳍长的 23.5-24.1% ）。23.5-24.1%）、头部较长（长度为单鳍长的 39.0-39.4% 对单鳍长的 35.6-36.3%）、眼睛较大（眼眶直径为单鳍长的 13.5-14.1% 对单鳍长的 11.0-11.7%）、胸鳍较长（长度为单鳍长的 27.8-29.8% 对单鳍长的 24.7-26.4%）。由于 C. pulchella 模式标本的线粒体 COI 序列与菲律宾标本的线粒体 COI 序列非常吻合，因此该物种可能广泛分布于从琉球群岛到菲律宾的大陆坡上部。

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来源期刊

Ichthyological Research 生物-动物学

CiteScore

2.80

自引率

16.70%

发文量

审稿时长

3 months

期刊介绍： Ichthyological Research is an official journal of the Ichthyological Society of Japan and is published quarterly in January, April, July, and November. Ichthyological Research primarily publishes research papers on original work, either descriptive or experimental, that advances the understanding of the diversity of fishes. Ichthyological Research strives to cover all aspects of fish biology, including taxonomy, systematics, evolution, biogeography, ecology, ethology, genetics, morphology, and physiology.