A new species of the armored catfish Parotocinclus (Loricariidae: Hypoptopomatinae), from the Amazon basin in Colombia

Abstract

A new species of hypoptopomatine cascudinho is described from a creek tributary to the Amazon River in Leticia, Amazonas Departament, Colombia. The new species of Parotocinclus is distinguished from congeners from northeastern to southeastern Brazilian rivers in having the cheek canal plate elongated posteriorly on the ventral surface of head and contacting the cleithrum. It is diagnosed from P. collinsae (Essequibo River basin, Guiana) and P. halbothi (rio Trombetas basin, Brazil and Marowijne River, Suriname), by having a triangular patch of dark pigmentation on the anterior portion of the dorsal-fin membrane, by the absence of unicuspid accessory teeth on both the premaxilla and dentary, and by having a Y-shaped light mark on the snout. The new species of Parotocinclus is distinguished from all remaining congeners by having a pigmentation pattern consisting of conspicuous dark dots smaller than a pupil diameter, broadly distributed dorsally and ventrally.Uma espécie nova de cascudinho hypoptopomatíneo é descrita de um igarapé afluente do rio Amazonas em Leticia, Departamento Amazonas, Colômbia. A espécie nova de Parotocinclus é diagnosticada de suas congêneres do nordeste e sudeste do Brasil por ter a placa com canal da bochecha alongada posteriormente na superfície ventral da cabeça e em contato com o cleitro. A espécie nova é diagnosticada de P. collinsae (bacia do rio Essequibo, Guiana) e P. halbothi (bacia do rio Trombetas, Brasil e rio Marowijne, Suriname), por possuir uma mancha de pigmentação escura triangular na porção anterior da membrana da nadadeira dorsal, pela falta de dentes acessórios unicúspides na pré-maxila e no dentário, e por possuir uma mancha clara em forma de Y no focinho. A espécie nova de Parotocinclus se distingue das demais congêneres por possuir um padrão de pigmentação do corpo consistindo de conspícuos pontos escuros menores do que um diâmetro da pupila, amplamente distribuídos dorsal e ventralmente.

A new species of armored catfish Parotocinclus (Siluriformes: Loricariidae) from the rio Parnaíba basin, northeastern, Brazil

“…The non-monophyletic Parotocinclus is up-to-date composed by 30 species distributed in the cisandine neotropics drainages (Lehmann et al, 2015;Ramos et al, 2016;Roxo et al, 2016). The resolution of this systematic problem depends on the designation of new genera that reflect the relationships among the lineages currently assigned to Parotocinclus (Lehmann et al, 2014).…”

“…The genus is widely distributed in cis-andean South America, including the Orinoco, Amazon, Parnaíba and São Francisco river basins, the Atlantic coastal drainages of the Guianas, and the coastal rivers from Northeastern Brazilian states as well as the coastal rivers between the states of Espírito Santo and Santa Catarina (Garavello, 1977(Garavello, , 1988Schaefer, 2003;Lehmann et al, 2015;Roxo et al, 2016).…”

“…The northeastern Brazil includes the highest species richness of the small armored catfishes Parotocinclus, with 12 of 30 nominal species (Ramos et al, 2016;Lehmann et al, 2015;Roxo et al, 2016). Five of these species were described by Garavello (1977Garavello ( , 1988: Parotocinclus cristatus Garavello, P. jimi Garavello and P. minutus Garavello, all from eastern coastal basins of Bahia State (Northeastern Mata Atlântica ecoregion, NMAE), P. cearensis Garavello from rio Acaraú and Choró basins, Ceará State (Mid-Northeastern Caatinga ecoregion, MNCE), and P. haroldoi Garavello from rio Parnaíba basin, Piauí State (Maranhão-Piauí ecoregion, MAPE).…”

Description of a new species of Parotocinclus (Siluriformes, Hypoptopomatinae) from the rio Tapajós basin

“…Cramer et al 2011; Roxo et al 2014; Silva et al 2016). This genus is distributed through almost all hydrographic systems in South America from the Guyana Shield drainages and Amazon Shield tributaries to the coastal drainages of eastern and southeastern Brazil, including the rio São Francisco basin (Sarmento-Soares et al 2009; Lehmann et al 2014, 2015). …”

Redescription of the endangered hypoptopomatine catfish Parotocinclus spilurus (Fowler, 1941) (Siluriformes: Loricariidae) from the upper rio Jaguaribe basin, northeastern Brazil

“…Currently, Parotocinclus comprises 29 valid nominal species (Ramos et al, 2013;Lehmann et al, 2013Lehmann et al, , 2014Lehmann et al, , 2015, but it is recognized as a polyphyletic assemblage (Gauger & Buckup, 2005;Lehmann, 2006;Lehmann et al, 2013;Martins et al, 2014). The genus Parotocinclus has a high species richness in northeastern Brazil, being represented by twelve species (Ramos et al, 2013).…”