Fernando César Paiva Dagosta

Abstract The Tocantins-Araguaia River basin hosts an elevated number of fish species, and new species have been continuously described. In this basin, we investigated patterns of endemic fish species descriptions examining their association with species distribution range, altitudinal gradient, fluvial hierarchy of watercourses, and sampling effort. For each species, we collected its year of taxonomic description, geographical coordinates of its holotype, body size (a proxy for species range), fluvial hierarchy of watercourses, and both altitude and sampling effort related to the locality of the holotype. The number of taxonomic descriptions was positively correlated to sampling effort, and better-sampled regions accumulated more descriptions over time. Moreover, altitude was positively correlated to the year of species description, whereas body size was negatively correlated to it. While species with recent descriptions were more associated to first to third order streams, species with recent and older descriptions were associated to high-order rivers. Therefore, fish species with broader distributions tend to have older descriptions in regions of lower altitude, whereas species with restricted distributions recent descriptions at higher altitudes. Increasing efforts in the upper regions of the Tocantins-Araguaia basin seems to be a good and fruitful strategy for reducing the Linnean shortfall.

10.1590/1982-0224-2023-0128

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Description of a New Species ofMoenkhausia(Characiformes, Characidae) from the Upper Rio Tapajós Basin, Brazil

Copeia (2016)

Manoela M. F. Marinho Fernando César Paiva Dagosta Priscila Camelier Flávio C. T. Lima

A new species of Moenkhausia is described from the upper Rio Juruena, Rio Tapajós basin, Mato Grosso, Brazil. The new species is diagnosed from all congeners, except M. eurystaenia, M. heikoi, and M. phaeonota, by the presence of a dark, straight, broad stripe extending from the opercle to the middle caudal-fin rays. The new species can be distinguished from M. heikoi and M. phaeonota by having 18–20 branched anal-fin rays and from M. eurystaenia by having a narrow longitudinal dark line along the horizontal septum, starting at the vertical through the pelvic-fin origin. The presence of a conspicuous dark blotch on the ventral portion of the opercle and on the ventral portion of the vertical arm of the preopercle is also useful to distinguish the new species from most congeners.

Characiformes

Characidae

Fish fin

Amazon basin

10.1643/ci-14-216

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Citations (3)

ESRI Shapefile - Dagosta de Pinna (2017)

Harvard Dataverse (2020)

Fernando César Paiva Dagosta

ESRI Shapefile of north South America "biogeographical units" of fishes. Division proposed in Dagosta de Pinna (2017).

Shapefile