Description of two deep-water fishes of the genus Diplotaxodon (Teleostei: Cichlidae) from Lake Malaŵi, Africa

IF 0.5 4区生物学 Q3 Agricultural and Biological Sciences

Proceedings of the Biological Society of Washington Pub Date : 2018-04-03 DOI:10.2988/PBSW-D-17-00004

J. R. Stauffer, T. Phiri, A. Konings

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引用次数: 1

Abstract

Abstract Two species of haplochromine cichlid fishes of the genus Diplotaxodon Trewavas, endemic to Lake Malaŵi are described: Diplotaxodon longimaxilla, new species, and Diplotaxodon altus, new species. Diplotaxodon altus is diagnosed from other species in the genus based on body depth (35.1–37.8% SL), number of gill rakers (21–26), and a smaller cheek depth (18.2–20.0% HL). Diplotaxodon longimaxilla is delimited from other Diplotaxodon spp. based on body depth (28.9–32.4% SL), horizontal eye diameter (HED 27.1–32.1% HL), smaller cheek depth (15.2–19.4% HL), and number of lateral-line scales (35–38). Other authors have indicated that several other Diplotaxodon spp. occur, but too few specimens were available to permit detailed comparisons. The two new species occur sympatrically at depths of between 40–130 m. Specimens of Diplotaxodon altus were sampled from nets deployed at night using light attraction, while specimens of D. longimaxilla were sampled from nets operated both at night and day. We further examined the three co-types of Diplotaxodon argenteus, the type species of the genus, and designated a lectotype.

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非洲Malaŵi湖梁龙属两种深水鱼类的描述(直鳍鱼科:慈鱼科)

摘要描述了马拉湖特有的Trewavas Diplotaxodon属的两种单倍色慈鲷：长颌Diplotaodon新种和altus Diplotaxon新种。根据身体深度（35.1–37.8%SL）、鳃耙数量（21–26）和较小的脸颊深度（18.2–20.0%HL），可以从该属的其他物种中诊断出Diplotaxodon altus。长颌双齿龙与其他双齿龙属区分开来。根据体深（28.9–32.4%SL）、水平眼直径（HED 27.1–32.1%HL）、较小脸颊深度（15.2–19.4%HL）和侧线鳞片数量（35–38）。其他作者指出，还存在其他几种Diplotaxodon属，但可用的标本太少，无法进行详细的比较。这两个新物种共同出现在40–130米的深度。Diplotaxodon altus的标本是从夜间使用光吸引布设的网中取样的，而D.longima颌虫的标本是在夜间和白天使用的网中采样的。我们进一步研究了该属的模式种阿根廷双紫杉的三个共型，并确定了一个选型。

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来源期刊

Proceedings of the Biological Society of Washington 生物-生物学

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0.00%

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审稿时长

>12 weeks

期刊介绍： The official publication of the Biological Society of Washington, the Proceedings of the Biological Society of Washington is an international journal containing peer-reviewed papers that broadly bear on systematics in the biological sciences (botany and zoology), paleontology, and notices of business transacted at Society meetings.