Journal Article

A new troglomorphic species of Trichomycterus (Siluriformes: Trichomycteridae) from northeastern Colombia, with proposal of a new Trichomycterus subclade and remarks on some nominal species from Colombia

DoNascimiento, C. and Prada-Pedreros, S.

Record Number:
4536
Year:
2020
Journal:
Journal of Fish Biology
Pages:
968-985
Volume:
96
Abstract:
Trichomycterus spectrum is described as a new species from the Alejo cave, drained by the Ranchería River basin, in La Guajira department, north-eastern Colombia, and is the first troglomorphic species described from this region. The new species shows an advanced degree of troglomorphisms expressed as eyes absent, long barbels and body depigmented. Trichomycterus spectrum is diagnosed by the putatively autapomorphic presence of a posterior process at the anterolateral corner of the epioccipital, and is also recognized by the derived presence of a circular foramen on the neural spine of the complex vertebra and the following posterior vertebra, and by the apomorphic presence of a well-developed coracoid bridge, distally expanded, and contacting or almost reaching the lateral margin of the cleithrum. The new species also shows the derived origin of the levator internus 4 on the dorsal surface of the posttemporo-supracleithrum that supports Trichomycterinae monophyly. We also propose a monophyletic subgroup provisionally within Trichomycterus, here named the Trichomycterus taenia species group, which includes species distributed in cis- and trans-Andean drainages in northern South America. The taxonomic status of several recently described nominal species from Colombia is discussed, with several synonymy proposals.
Times Cited:
1
Related Records:
DoNascimiento, C. and Prada-Pedreros, S. (2020)
A new troglomorphic species of Trichomycterus (Siluriformes: Trichomycteridae) from northeastern Colombia, with proposal of a new Trichomycterus subclade and remarks on some nominal species from Colombia
Flórez, J.S., Cadena, C.D., DoNascimiento, C. and Torres, M. (2020)
Repeated colonization of caves leads to phenotypic convergence in catfishes (Siluriformes: Trichomycterus) at a small geographical scale