Nove espécies novas do gênero Rineloricaria (Siluriformes, Loricariidae) do rio Uruguai, do sul do Brasil

Abstract

ABSTRACT. Nine new species of the genus Rineloricaria (Siluriformes, Loricariidae) from Uruguay river, southern Brazil. Nine new species of Rineloricaria are described from upper and middle rio Uruguay basin in states of Rio Grande do Sul and Santa Catarina, Brazil. Rineloricaria misionera Rodriguez & Miquelarena, 2005 is the only species currently known from this basin. The new species are diagnosed mainly by abdominal plates arrangement, color pattern, extension of the anterior snout naked area, and fins length. The species described here are endemic to the rio Uruguay. Rineloricaria anitae and R. tropeira are restricted to the tributaries of the rio Canoas and the rio Pelotas; R. zaina is widely distributed from the confluence of the rio Canoas with the rio Pelotas to the rio Ibicuí; R. anhanguapitan is restricted to the rio Passo Fundo; R. capitonia occurs in the upper rio Ijuí; R. stellata is known from the rio Buricá, rio Ijuí, rio Piratini and rio Ibicuí; R. setepovos and R. reisi are described from the rio Piratini; and R. sanga is only known from the vicinity of Iraí. Comments on the fish diversity of the rio Uruguay and on the variation of abdominal plates in Rineloricaria are made.

A new species of Rineloricaria (Siluriformes: Loricariidae: Loricariinae) from rio Daraá, rio Negro basin, Amazon, Brazil

“…All of those species have the abdominal area completely or partly plated (Rodriguez & Reis, 2008;Ghazzi, 2008). When completely covered, the abdominal plates are organized in series and the preanal plate is surrounded by three large quadrangular plates.…”

“…but we are not aware of any Amazonian species of Rineloricaria with such a restricted distribution. On the other hand, disjunct geographic range has been registered on some representatives of Rineloricaria from rio Paraná, Uruguay and southern Brazilian coastal drainages (Rodriguez & Reis, 2008;Ghazzi, 2008 Isbrücker & Nijssen, 1979), Rupununi River.…”

“…Rineloricaria Bleeker, 1862, is the most species-rich genus of the Loricariinae with approximately 60 species (Rodriguez & Reis, 2008;Ghazzi, 2008), and widely distributed from Panama in Central America to northern Argentina, on both slopes of the Andes (Reis & Cardoso, 2001;Covain & Fisch-Muller, 2007). Rineloricaria has been diagnosed by a combination of characters, such as presence of a small postorbital notch, surface of the inferior lip bearing short buttonlike papillae, each hemi-maxilla carrying up to 15 short mandibulary teeth, teeth strong and deeply forked, dark bands on the dorsal region of the body with the first one at the origin of dorsal fin, pectoral fin with one spine and six branched rays, a distinctly polygonal preanal plate usually surrounded by three to five other plates, and conspicuous sexual dimorphism in mature males, consisting of numerous developed odontodes along the sides of the head, on the pectoral-fin spine and predorsal area (Isbrücker & Nijssen, 1992: figs.…”

Rineloricaria osvaldoi (Siluriformes: Loricariidae): a new species of armored catfish from rio Vermelho, Araguaia basin, Brazil

“…Although the group is widespread throughout the Neotropical region, only a few species are known to occur in some basins, such as Araguaia-Tocantins and São Francisco rivers, in contrast to South and Southeastern Brazilian drainages, in which many species of Rineloricaria are known (see Ferraris, 2003;Rodriguez & Miquelarena, 2005;Ghazzi, 2008, andReis, 2008). Only two other species are known from the rio Araguaia-Tocantins system, R. lanceolata and R. hasemani.…”

“…The genus comprises 59 valid species (Ferraris, 2003;Knaack, 2003;Ghazzi, 2008;Rodriguez & Reis, 2008), distributed from Panama, in Central America to Northeast Argentina. Rineloricaria species are found in a large variety of habitats, including large rivers, streams, and lagoons, associated with bottoms consisting of sand or rocks, sometimes found in marginal vegetation.…”