A new species of Tyttocharax (Characiformes: Characidae: Stevardiinae) from the Güejar river, Orinoco river Basin, Colombia

Abstract

A new Tyttocharax species from the Güejar River system, near the Macarena Mountains in Colombia is described. This is the first record for the genus from the Orinoco basin. The combination of the following characters distinguish Tyttocharax metae from its congeners: presence of bony hooks on the pectoral and caudal-fin rays; bony hooks on the anal-fin rays larger than those on the pelvic-fin rays; pectoral-fin rays i,5-6,i; presence of three unbranched dorsal-fin rays; absence of an adipose fin; four scales rows between the anal-fin origin and the lateral line; and four scale rows between the pelvic-fin and the lateral line. Ecological characteristics of the habitat of the new species are also presented.Una nueva especie de Tyttocharax se describe para la cuenca del río Güejar, Serranía de La Macarena en Colombia. Tyttocharax metae es un nuevo registro del género para la cuenca del río Orinoco. La combinación de los siguientes caracteres distingue a Tyttocharax metae de sus congéneres: presencia de ganchos óseos en los radios de las aletas pectorales y caudal; ganchos óseos en los radios de la aleta anal de mayor tamaño que los de las aletas pélvicas; radios de las aletas pectorales i,5-6,i; tres radios simples en la aleta dorsal; ausencia de una aleta adiposa; cuatro escamas entre la línea lateral y el origen de la aleta anal, y cuatro escamas entre la línea lateral y las aletas pélvicas. Se incluyen datos ecológicos del hábitat propio del nuevo taxón.

Priocharax nanus, a new miniature characid from the rio Negro, Amazon basin (Ostariophysi: Characiformes), with an updated list of miniature Neotropical freshwater fishes

“…Over a decade later, Costa & Le Bail (1999) added 24 Neotropical freshwater fish species to that list including four characiforms, seven siluriforms and 13 cyprinodontiforms. Since then, a great number of miniature Neotropical freshwater fishes have been discovered (e.g., Moreira, 2005;Schaefer et al, 2005;Caires & Figueiredo, 2011;Dutra et al, 2012;Román-Valencia et al, 2012;Netto-Ferreira et al, 2013a), quite a number of which were placed into new monotypic genera (e.g., Géry & Romer, 1997;Bührnheim et al, 2008;Zarske, 2010;Ribeiro et al, 2012;Netto-Ferreira et al, 2013b;Mattox et al, 2013). Since Weitzman & Vari's (1988) and Costa & Le Bail's (1999) lists, the Check List of Freshwater Fishes of South and Central America has been published , which helped to organize knowledge on Neotropical species and highlighted many miniature forms (sensu Weitzman & Vari, 1988) not included in previous lists.…”

A new characid species with remarkable sexual dimorphism (Characiformes: Characidae: Stevardiinae) from the upper Guayabero River, Orinoco basin, Colombia

“…The presence of these species is possibly related to processes of speciation and capture of headwaters derived from past events between the upper part of the Guaviare River basin and neighboring Amazon basins. This can be supported by the presence of some genera such as Chrysobrycon Weitzman & Menezes 1998 (Vanegas‐Rios et al, 2015), Tyttocharax Fowler 1913 (Román‐Valencia et al, 2012), and Phreatobius Goeldi 1905 (Zamudio et al, 2019), considered until recently to be typical of the Amazon basin. It also includes the rheophilic species Chaetostoma platyrhynchus Fowler 1943 that occurs in the upper Caquetá River (see photo 27 in Chindoy et al, 2019) and in the upper Guaviare River (see photo 90 in DoNascimiento et al, 2018).…”

“…The presence of these species is possibly related to processes of speciation and capture of headwaters derived from past events between the upper part of the Guaviare River basin and neighboring Amazon basins. This can be supported by the presence of some genera such as Chrysobrycon Weitzman & Menezes 1998(Vanegas-Rios et al, 2015, Tyttocharax Fowler 1913(Román-Valencia et al, 2012, and Phreatobius Goeldi 1905 (Zamudio et al, 2019), considered until recently to be typical of the Amazon…”

Registros de los hallazgos originales de peces dulceacuícolas de Colombia, entre 2010 y 2019.

“…Se realizó una revisión integral y exhaustiva de las bases de datos bibliográficas (FishBase, IUCN, Eschmeyer´s Word Catalog of Fishes: Genera, Species, References, Electronic Version, entre otras); utilizando como palabras claves: ictiología de Colombia en el periodo 2010-2019, nuevas especies de peces dulceacuícolas, cuencas hidrográficas, respecto a la producción bibliográfica nacional e internacional sobre los peces de agua dulce de Colombia en revistas especializadas ( del Quindío, Vertebrate Zoology, ZooKeys, Zootaxa) y se hallaron 72 publicaciones: CASTELLANOS-MORALES (2010), ARDILA-RODRÍGUEZ (2010, 2011a, 2011b, 2011c, 2011d, GARCÍA-ALZATE et al (2010a, 2010b, 2010c, BALLEN-CHAPARRO (2011), LONDOÑO-BURBANO et al (2011), ORTEGA-LARA et al (2011), LONDOÑO-BURBANO et al (2011), MESA-SALAZAR & LASSO-ALCALÁ (2011a, 2011b, ARDILA-RODRÍGUEZ (2012, 2013a, 2013b, 2014a, 2014b, 2015, DUPLAIN et al (2012), GARCÍA-ALZATE et al (2012), ROMÁN-VALENCIA et al (2012), TORRES-MEJÍA et al (2012), de SANTANA & VARI (2013), ROMÁN-VALENCIA et al (2013), TAPHORN-BAECHLE et al (2013), VANEGAS-RÍOS et al (2013), VERMEULEN (2013), BALLÉN-CHAPARRO & MOJICA-CORZO (2014), DONASCIMIENTO-MONTOYA et al (2014), ROMÁN-VALENCIA et al (2014a, 2014b, SABAJ-PÉREZ et al (2014), ARDILA-RODRÍGUEZ (2015a, 2015b, ARMBRUSTER et al (2015),…”