Two new ornamental loricariid catfishes of Baryancistrus from rio Xingu drainage (Siluriformes: Hypostominae)

Abstract

Two new species of the hypostomine genus Baryancistrus are described from the rio Xingu drainage. Baryancistrus xanthellus is distinguished from all other Baryancistrus species by the presence of yellow spots along the entire body and conspicuous yellow marks on distal tip of dorsal and caudal fins. Baryancistrus chrysolomus is distinguished from its congeners by its uniform dark body coloration and presence of yellow bands on dorsal and caudal fins. Despite the lack of formal description, these species are very popular in the international aquarium trade. We expect that these formal descriptions might contribute to the improvement of Brazilian regulations in the international trade of ornamental loricariids.Duas espécies novas de hipostomíneos do gênero Baryancistrus são descritas da bacia do rio Xingu. Baryancistrus xanthellus se diferencia de todas as outras espécies de Baryancistrus pela presença de pontos amarelos em todo o corpo e presença de manchas conspícuas amarelas nas pontas das nadadeiras dorsal e caudal. Baryancistrus chrysolomus se distingue de seus congêneres pela sua coloração escura uniforme e presença de uma faixa amarela nas nadadeiras dorsal e caudal. Apesar de não estarem formalmente descritos, esses peixes são muito populares no comércio aquariofilista internacional. Esperamos que essas descrições formais contribuam para melhorar a regulamentação brasileira no comércio internacional de loricariídeos ornamentais.

Two new species of Pseudancistrus (Siluriformes, Loricariidae) from the Amazon basin, northern Brazil

“…4) in juveniles and medium-sized adults (to approximately 100 mm SL), a pattern unique among Pseudancistrus . This character is similar to that found in Baryancistrus xanthellus (Py Daniel et al 2011) and Baryancistrus chrysolomus (Py Daniel et al 2011), both of which are also from the rio Xingu basin and live sympatrically with Pseudancistrus asurini . Additionally, the new species Pseudancistrus asurini has a color pattern consisting of spots that increase in size from the head (diameter 0.3−0.8 mm) to posterior part of body (diameter 0.7−1.3).…”

Cytogenetic analysis of Baryancistrus xanthellus (Siluriformes: Loricariidae: Ancistrini), an ornamental fish endemic to the Xingu River, Brazil

“…Baryancistrus Rapp Py-Daniel, 1989 is allocated into the Ancistrini and has six described species (Rapp Py-Daniel et al, 2011) that are unique due to their exuberance and diversity of coloration and are, therefore, highly demanded in the fishkeeping market. The presence of yellow spots throughout its body and yellow markings on its dorsal and caudal fins characterize this species.…”

“…Due to the presence of these spots, which vary in size and intensity, this species is commonly known as "amarelinho" or "golden nugget pleco". This species is rheophilic, and its distribution is strongly linked to the rapids of the Xingu River (Rapp Py-Daniel et al, 2011), which is target for several constructions to take advantage of its hydroelectric potential (Junk & Mello, 1990). Near the middle of its course, the Xingu River receives the Iriri River and posteriorly suffers an accentuated deflection, forming the region known as the Volta Grande do Xingu.…”

Phylogeography of Baryancistrus xanthellus (Siluriformes: Loricariidae), a rheophilic catfish endemic to the Xingu River basin in eastern Amazonia

“…Baryancistrus xanthellus is restricted to where the channels of the Xingu River and its major tributaries, the Iriri and Bacajá, flow over Precambrian igneous and metamorphic rocks [12] of the Brazilian Shield (Fig 1). Commonly known as golden-nugget pleco, this species is recognized by having gold-colored spots on the body and conspicuous yellow bands along the distal margins of the caudal and dorsal fins [13]. Because of its attractive color pattern, this species is highly popular as an ornamental fish [14].…”