Two new species ofPseudopimelodusBleeker, 1858 (Siluriformes: Pseudopimelodidae) from the Magdalena Basin, Colombia

Abstract

The family Pseudopimelodidae is widely distributed in South America and includes 51 described species organized in seven genera. Only two of four species of the genus Pseudopimelodus have been recorded for the trans-Andean basins of Colombia, Pseudopimelodus bufonius and P. schultzi, whose similarity in external morphology make their identification difficult. We performed a phylogenetic analysis using a fragment of the Cytochrome C Oxidase subunit 1 gene (COI), and analyzed osteological and traditional morphometric characters to study Pseudopimelodus from the Colombian trans-Andean region. Results provided strong support for two clades phylogenetically related to Pseudopimelodus, that showed clear-cut molecular, osteological, and morphometric differences from previously described bumblebee catfishes. Based on these results, we describe two Pseudopimelodus species from the Magdalena-Cauca River Basin: P. magnus sp. nov. with 43–44 vertebrae, dorsal-fin spine with serrations on its anterior margin; lateral margin of transverse process of the fourth vertebra of the Weberian complex forming an acute angle in ventral view and P. atricaudus sp. nov. with 39 vertebrae, dorsal-fin spine smooth on its anterior margin and a dark, vertical band covering 3/4 of the caudal fin with base of rays and tip of caudal-fin lobes hyaline.

Rediscovery of Rhyacoglanis pulcher (Boulenger, 1887) (Siluriformes: Pseudopimelodidae), a rare rheophilic bumblebee catfish from Ecuadorian Amazon

“…This study provides the first COI sequence of Rhyacoglanis pulcher associated with a voucher properly identified. The supposed COI records for "Rhyacoglanis pulcher" used in some studies [29][30][31], and available in Genbank (EU179812, LBP1567, Das Mortes river) actually represent a single sequence, which show a genetic distance of 3.5% compared with the specimen herein analyzed (Table 4). Thereby, we corrected the "Das Mortes river" COI record to Rhyacoglanis sp.…”

Phylogenomics of the bumblebee catfishes (Siluriformes: Pseudopimelodidae) using ultraconserved elements

“…Pseudopimelodidae is currently divided into seven genera: Batrochoglanis Gill, 1858; Cephalosilurus Haseman, 1911; Cruciglanis Ortega‐Lara & Lehmann, 2006; Lophiosilurus Steindachner, 1889; Microglanis Eigenmann, 1912; Pseudopimelodus Bleeker, 1858, and Rhyacoglanis Shibatta & Vari, 2017. The systematic understanding of the family was recently improved with the descriptions of two genera (Ortega‐Lara & Lehmann, 2006; Shibatta & Vari, 2017), and multiple species, especially in Batrochoglanis (Shibatta, 2019; Shibatta & Pavanelli, 2005), Microglanis (e.g., Sarmento‐Soares et al, 2006; Ruiz, 2016; Shibatta, 2016; Terán et al, 2016; Souza‐Shibatta et al, 2018), and Pseudopimelodus (Restrepo‐Gómez et al, 2020). Sixteen out of the 53 valid species of Pseudopimelodidae were described in the last 10 years (Fricke et al, 2021).…”