A new species of the blind and miniature genus Micromyzon Friel and Lundberg, 1996 (Silurifomes: Aspredinidae) from the Orinoco River: describing catfish diversity using high-resolution computed tomography

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 : 2016-12-29 DOI:10.1635/053.165.0104

T. P. Carvalho, J. Lundberg, J. Baskin, J. Friel, R. Reis

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引用次数: 8

Abstract

ABSTRACT A new species of the aspredinid catfish tribe Hoplomyzontini Micromyzon is described from two specimens collected with trawl nets in two localities, at 10 and 18 m depth, in the main channel of the lower Orinoco River in Venezuela almost 40 years ago. The new species is distinguished from its only congener, Micromyzon akamai, by the: straight anterior margin of the mesethmoid; open posterior cranial fontanel; ossified first pectoral-fin radial; single tubular infraorbital bone; infraorbital sensory canal entering neurocranium via the frontal; enclosed foramen for the abductor superficialis muscle in the coracoid; higher vertebral count (33 vs. 28–32); higher anal-fin ray count (10 or 11 vs. 7–9); and some morphometric features. The holotype of the new species was scanned using High-Resolution X-ray Computed Tomography to illustrate, describe, and compare its bony skeleton to other hoplomyzontins.

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研究:用高分辨率计算机断层成像技术描述奥里诺科河鲶鱼的多样性

摘要:近40年前，在委内瑞拉奥里诺科河下游主河道10米和18米深度的两个地方，用拖网采集了两个标本，描述了一种新的卷尾纲鲶鱼部落Hoplomyzontini Micromyzon。这个新种与它唯一的同系物akamai小种的区别在于:中筛直的前缘;打开颅后囟门;骨化的第一胸鳍放射状;单管眶下骨;眶下感觉管经额部进入神经颅骨;喙状肌外展浅肌的封闭孔;较高的椎体计数(33 vs 28-32);肛门鳍数更高(10或11比7-9);还有一些形态特征。使用高分辨率x射线计算机断层扫描对新物种的全型进行了扫描，以说明，描述并将其骨骼与其他全型区进行比较。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.