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

Tiago P. Carvalho; John G. Lundberg; Jonathan N. Baskin; John P. Friel; Roberto E. Reis

doi:10.1635/053.165.0104

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29 December 2016 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

Tiago P. Carvalho, John G. Lundberg, Jonathan N. Baskin, John P. Friel, Roberto E. Reis

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Proceedings of the Academy of Natural Sciences of Philadelphia, 165(1):37-53 (2016). https://doi.org/10.1635/053.165.0104

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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Tiago P. Carvalho, John G. Lundberg, Jonathan N. Baskin, John P. Friel, and Roberto E. Reis "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," Proceedings of the Academy of Natural Sciences of Philadelphia 165(1), 37-53, (29 December 2016). https://doi.org/10.1635/053.165.0104

Received: 2 November 2016; Accepted: 14 December 2016; Published: 29 December 2016

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