Platydoras birindellii, new species of striped raphael catfish (Siluriformes: Doradidae) from the Xingu Basin, Brazil

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 : 2017-11-01 DOI:10.1635/053.166.0106

L. Sousa, Mateus S. Chaves, A. Akama, J. Zuanon, M. Sabaj

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引用次数: 7

Abstract

Abstract. A new species of Platydoras is described from the rio Xingu Basin, Brazil. Platydoras birindellii is distinguished from congeners by having gas bladder simple (vs. with posterior secondary chamber) and dorsal and caudal fins uniformly dusky (vs. with distinct marks composed of dark broad band or blotch on central portion of dorsal fin and pair of dark broad stripes on caudal fin, one central to each lobe). Platydoras birindellii shares a simple gas bladder with the sister taxon to Platydoras, Centrochir crocodili, a monotypic genus endemic to the Magdalena Basin. With respect to the caudal skeleton, the parhypural is incompletely fused to hypurals 1+2 in P. birindellii, a condition that is intermediate between those of Centrochir (parhypural typically separated from hypurals 1+2 by distinct suture) and Platydoras (parhypural typically fully fused to hypurals 1+2). Platydoras birindellii is commonly found in rocky clearwater rapids and apparently endemic to the middle and upper portions of the Xingu draining the Brazilian Shield. New taxa: Platydoras birindellii Sousa, Chaves, Akama, Zuanon & Sabaj

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巴西新谷盆地斑胸鲇属新种（鲇形目：胸鲇科）

摘要本文报道了巴西新谷盆地的一新种Platydoras。比林氏扁口鱼与同类鱼的区别在于，它有简单的气囊（与有后副腔的相比），背鳍和尾鳍均匀地变暗（与背鳍中央部分有由深色宽带或斑点和尾鳍上一对深色宽条纹组成的明显标记，每个叶中央一条）。比林德利扁齿鳄与中央鳄鱼扁齿鳄的姐妹分类单元共享一个简单的气囊，中央鳄鱼是马格达莱纳盆地特有的单型属。就尾侧骨骼而言，毕林德氏毕林德利氏毕恩德利虫的颞侧部分与颞侧部分1+2不完全融合，这种情况介于中央肌（颞侧部分通常通过不同的缝线与颞侧部1+2分离）和Platydoras（颞侧部部分通常与颞侧1+2完全融合）之间。比林德利Platydoras birindellii常见于岩石清澈的急流中，显然是巴西地盾中上游新谷的特有种。新分类群：Platydoras birindellii Sousa、Chaves、Akama、Zuanon和Sabaj

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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.