Topic
Micromyzon
About: Micromyzon is a research topic. Over the lifetime, 2 publications have been published within this topic receiving 10 citations.
Papers
29 Dec 2016
TL;DR: A new species of the aspredinid catfish tribe Hoplomyzontini Micromyzon is described from two specimens collected with trawl nets in two localities in the main channel of the lower Orinoco River in Venezuela almost 40 years ago.
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.
10 citations
TL;DR: External morphological characters and a phylogenetic analysis of the cytochrome c oxidase I (COI) gene support identification of the new specimens as Micromyzon akamai, but also indicate that some features previously hypothesized to be apomorphic for MicromyzoAkamai are intraspecifically variable.
Abstract: Two specimens of Micromyzon akamai, an eyeless and miniaturized species previously known only from the deep channels of the eastern Amazon basin in Brazil, are reported from the Curaray River, a tributary of the Napo River in Ecuador. The new specimens are the first records of Micromyzon in the headwaters of the Amazon River and the first records of M. akamai outside Brazil. External morphological characters and a phylogenetic analysis of cytochrome c oxidase I (coI) gene support the identification of the new specimens as M. akamai. Nevertheless, the new specimens also indicate that some features previously hypothesized to be apomorphic for M. akamai are intraspecifically variable.
6 citations
Performance Metrics
| Year | Papers |
|---|---|
| 2021 | 1 |
| 2016 | 1 |