Microglanis nigrolineatus, a new species from northwestern Argentina (Ostariophysi: Pseudopimelodidae)
Autors
Guillermo E. Terán*, Lucas R. Jarduli**,***, Felipe Alonso****, J. Marcos Mirande* and Oscar A. Shibatta**
Fig. 1. Microglanis nigrolineatus, CI-FML 6596, holotype, 32.5 mm SL; Argentina: Salta province: Quebrada Colorada stream, Bermejo River basin.
Abstract
Microglanis nigrolineatus, new species, is described from streams of Bermejo River basin, northwestern Argentina. It is distinguished from all congeners by a combination of characters including a unique coloration pattern: a thin dark line that runs along middle body from vertical line through dorsal-fin origin to end of adipose fin, delimiting two dark-brown areas ending in a dark blotch crossing entire body depth just anterior to caudal-fin origin and dorsal region of head uniformly dark, lacking a paler area on nuchal region. Also, thorn serrae on anterior margin of pectoral-fin spine are short.
Fig. 2. Microglanis nigrolineatus, CI- FML6595, paratype, 43.6 mm SL; live specimen, before fixation; Argentina: Salta province: Quebrada Colorada stream, Bermejo River basin.
Introduction
Microglanis was proposed by Eigenmann (1912) and is the most diverse genus of Pseudopimelodidae, with 24 known species (Shibatta, 2014).
Fig. 4. Northwestern Argentina, showing the distribution of Microglanis nigrolineatus. , type locality at Quebrada Colorada stream, Bermejo River basin. , paratype localities.
Many of those species have been described in the latest years (Ruiz & Shibatta, 2011; Jarduli & Shibatta, 2013; Mattos et al., 2013; Shibatta, 2014) and more are waiting discovery.
Fig. 5. Type locality: Quebrada Colorada stream, Bermejo River basin, Salta, Argentina. May 2015.
Shibatta (1998) included the presumably monophyletic genus Microglanis in the Pseudopimelodidae, differing from other members of the family by a smaller body size, rarely reaching 80 mm of standard length, an incomplete lateral line, and a premaxillary tooth patch with rounded margin, without posterior projection (Schultz, 1944; Gomes, 1946; Mees, 1974, 1978). Microglanis has the widest distribution within the Pseudopimelodidae (Shibatta, 2003a). This genus occurs in the cisandean rivers between Venezuela and Uruguay, and in the transandean coastal rivers of Ecuador (Shibatta, 2003b; Bertaco & Cardoso, 2005). Two species are reported from Argentina: M. cottoides Boulenger, 1891 (Mirande & Koerber, 2015) and M. carlae Vera Alcaraz, da Graça & Shibatta, 2008 (Almirón et al., 2015). A recent collecting expedition to northwestern Argentina allowed us to discover an additional species from the upper Bermejo River basin. The aim of this work is to describe this new species of Microglanis.
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