Revision of the South American catfish genus Hypophthalmus (Siluriformes, Pimelodidae) with descriptions of two new species from the Amazon and Orinoco Basins

IF 0.5 4区环境科学与生态学 Q4 BIODIVERSITY CONSERVATION

Proceedings of the Academy of Natural Sciences of Philadelphia Pub Date : 2021-07-09 DOI:10.1635/053.167.0112

M. W. Littmann, J. Lundberg, Marcelo Salles Rocha

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引用次数: 3

Abstract

ABSTRACT. The pimelodid genus Hypophthalmus is a small group of pelagic and planktivorous catfishes that are abundant and variously distributed in the lowland river basins of the Amazon, Parnaíba, Orinoco, Guianas and Paraná. Since their earliest published descriptions, commencing over 190 years ago with H. edentatus Spix and Agassiz 1829, the taxonomy and nomenclature of Hypophthalmus species have been confused and unresolved. In this study, four of the six available species names are validated and two new species are described. Newly discovered characters of the vertebral column, circumoral barbels, pelvic fins, and lateralis sensory canals provide strong support and diagnostics for species and species-groups. A key to species, anatomical descriptions, notes on identification of small juveniles and phylogenetic interrelationships are included. A lectotype is designated for Hypophthalmus marginatus and nominal Hypophthalmus longifilis, respectively.

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南美小眼鲶鱼属的修正及亚马逊河流域和奥里诺科河流域两新种的描述

摘要。鼠尾属是一小群浮游和浮游鲶鱼，数量丰富，分布在亚马逊、帕尔纳伊巴、奥里诺科岛、圭亚那和巴拉那的低地河流流域。自从他们最早发表的描述（始于190多年前的H.edentatus Spix和Agassiz 1829）以来，下眼目物种的分类学和命名一直是混乱和悬而未决的。在这项研究中，六个可用物种名称中的四个得到了验证，并描述了两个新物种。新发现的脊柱、口周杠铃、骨盆鳍和外侧感觉管的特征为物种和物种群提供了强有力的支持和诊断。包括物种的关键、解剖学描述、关于小幼体鉴定的注释以及系统发育的相互关系。一个选择型分别指定为边缘下眼和名义长下眼。

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Proceedings of the Academy of Natural Sciences of Philadelphia 生物多样性保护-生物多样性保护

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期刊介绍： The Proceedings (ISSN 0097-3157) has been published continuously since 1841. Many volumes are still available in their original printings. Early volumes are unbound, constituting two or three issues per year. Quantities of some volumes may be limited. Early volumes may have slightly soiled cover sheets, but the text blocks are perfect.