A new species of the neotropical catfish genus Trichomycterus (Siluriformes: Trichomycteridae) representing a new body shape for the family.
Trichomycterus crassicaudatus is described as a new species from the Rio Iguac¸u basin in southern Brazil. The new species has an exceptionally deep posterior region of the body (caudal peduncle depth 22.8–25.4% SL), resulting in an overall shape which distinguishes it at once from all other members...
| Autores: | , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2008 |
| País: | Brasil |
| Institución: | Museu Paraense Emílio Goeldi (MPEG) |
| Repositorio: | Repositório Institucional do MPEG |
| Idioma: | inglés |
| OAI Identifier: | oai:repositorio.museu-goeldi.br:mgoeldi/286 |
| Acceso en línea: | http://repositorio.museu-goeldi.br/handle/mgoeldi/286 |
| Access Level: | acceso abierto |
| Palabra clave: | Peixes Trichomycterus crassicaudatus Siluriformes Trichomycteridae Catfish |
| Sumario: | Trichomycterus crassicaudatus is described as a new species from the Rio Iguac¸u basin in southern Brazil. The new species has an exceptionally deep posterior region of the body (caudal peduncle depth 22.8–25.4% SL), resulting in an overall shape which distinguishes it at once from all other members of the Trichomycteridae. The caudal fin of the species is broad-based and forked, a shape also distinguishing it from all other species in the family. A number of autapomorphic modifications of T. crassicaudatus are associated with the deepening of the caudal region, including an elongation of the hemal and neural spines of the vertebrae at the middle of the caudal peduncle. Phylogenetic relationships of the new species are yet unresolved, but it shares a similar color pattern and a thickening of caudal-fin procurrent rays with T. stawiarski, a poorly-known species also from the Rio Iguac¸u basin. Coloration and body shape also include similarities with T. lewi from Venezuela. |
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