A new species of Trichomycterus (Siluriformes: Trichomycteridae) from the upper río Magdalena basin, Colombia

Abstract

Trichomycterus tetuanensis, new species, is described from the río Tetuan, upper río Magdalena basin in Colombia. The new species is distinguished by its margin of caudal fin conspicuously emarginate, in combination with a high number of opercular odontodes (21-39), reflected externally in the large size of the opercular patch of odontodes, 3 irregular rows of conic teeth in the upper jaw, 42-52 interopercular odontodes, 8 branchiostegal rays, 37 post Weberian vertebrae, 7 branched pectoral-fin rays, hypural 3 separated from hypural plate 4+5, and background coloration light brown with darker dots uniformly sparse on dorsum and sides of trunk. Some apomorphic characters informative for the phylogenetic affinities of the new species within Trichomycterus are discussed.

Living in the waterfalls: A new species of Trichomycterus (Siluriformes: Trichomycteridae) from Tabay stream, Misiones, Argentina

“…Currently, the genus contains over 170 species [6], however, its known diversity remains increasing along the recent years. Even with these obstacles, species groups within Trichomycterus were defined based on morphological characteristics [11,25,26,27,28,29,30,31], some of them constantly redefined and re-diagnosed, such as the Trichomycterus brasiliensis species complex [14,32,33], which, to date, its monophyly could not be consistently assessed [34]. Besides, these characters and all species included on these groups were not placed into a comprehensive phylogenetic analysis, therefore with the possibility of representing artificial groups due to possible parallelisms.…”

Taxonomical study of Trichomycterus (Siluriformes: Trichomycteridae) from the Ribeira de Iguape River basin reveals a new species recorded in the early 20th century

“…Trichomycterus lauryi is distinguished from all congeners, with the exception of T. argos Lezama et al , , T. dispar , T. gironensis Ardila Rodríguez, , T. hualco Fernández & Vari, , T. manaurensis Ardila Rodríguez, , T. megantoni Fernández & Chuquihuamaní, 2007, T. punctulatus , T. rubiginosus Barbosa & Costa, , T. tetuanensis García‐Melo et al , and T. therma Fernández & Miranda, , by its outer layer of coloration composed of scattered, round, black or dark‐brown spots, smaller or equivalent in size to the circumference of the eye (Figures and ; vs . round spots absent or, if present, either noticeably larger than the circumference of the eye or arranged in longitudinal rows).…”

“…All species examined and incorporated in the molecular analysis (voucher specimens) were identified or validated by comparing with type specimens, original descriptions (i.e., Ardila Rodríguez, 2016, 2018; Barbosa & Costa, 2010;Fernandez & Chuquihuamaní, 2007;Fernández & Miranda, 2007;Fernández & Vari, 2009;García-Melo et al, 2016;Lezama et al, 2012) and other works with informative data (i.e., Bizerril, 1994;Datovo et al, 2012;Donin, 2019;Eigenmann, 1918;Ferrer & Malabarba, 2011Nascimento et al, 2017;Terán et al, 2017;Wosiacki, 2005;Wosiacki & Garavello, 2004;Wosiacki & Oyakawa, 2005), except for the genetic sequences available in GenBank obtained by Nascimento et al (2017)***, Ochoa et al (2017aOchoa et al ( , 2017b)* and Pereira et al (2011)**. In these cases, the taxonomic identifications provided by the respective author(s) were adopted and their authorship along the text and in the phylogenetic tree was annotated using asterisks (see earlier).…”

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

“…3, p. 36; T. striatus (Meek & Hildebrand 1913) in Angulo et al ., : fig. 4, p. 536; T. tetuanensis García‐Melo, Villa‐Navarro & DoNascimiento 2016 in García‐Melo et al ., : fig. 5, p. 232; T. uisae in Castellanos‐Morales, : fig.…”