Ichthyofauna of the rio Araguaia basin, states of Mato Grosso and Goiás, Brazil

Abstract

Materials and Methods Study site Fish samples were collected in the region of Serra Azul and Serra do Roncador in the upper-middle Araguaia basin, in the municípios Barra do Garças and Aragarças (Figure 1), in the states of Mato Grosso and Goiás respectively. The climate is tropical wet and characterized by two well defined seasons, rainy season (October to April) and dry season (May to September), with an average temperature of 25.5°C (Pirani et al. 2009). Data collection Ten sites were sampled in the tributaries of the Araguaia basin during the dry season, from July 29 to August 2, 2008 (Table 1). Fish collections were performed using standard ichthyological gear comprising sieves, seine nets and cast nets (IBAMA permit number 12120-1). The sampling effort included 60 minutes of sampling by three people at each site. Fish were fixed in 10% formalin solution and subsequently transferred to 70% ethanol. Species were identified up to the lowest possible taxonomic level, using available literature and further confirmation by experts when possible. The taxonomic classification follows Eschmeyer (2013). Voucher specimens were deposited in the fish collection of the

Two new catfish species of typically Amazonian lineages in the Upper Rio Paraguay (Aspredinidae: Hoplomyzontinae and Trichomycteridae: Vandelliinae), with a biogeographic discussion

“…3). The presence of the genus Ernstichthys in the rio Paraguay basin and in the rio Araguaia basin (Jarduli et al, 2014), is congruent with the pattern proposed for the group in Dagosta & de Pinna (2019). In that paper, Ernstichthys was one of the examples corroborating the pattern called "Cis-Andean Foothills", composed of taxa with distributions restricted to the uplands of the western region of South America, mainly in basins draining the Andean region.…”

“…Finally, the particular color pattern of the Araguaia specimen (with a thin inter-ocular bar but no trans-orbital bar and more or less regular-sized small spots forming a speckled covering on head and dorsum) is also not present in any E. taquari (although not much weight attaches to this difference because of the wide pigmentation variation in species of Hoplomyzontini and the limited number of specimens available). It is impossible at this time to confidently resolve the taxonomic status of the Ernstichthys specimen from the Rio Araguaia illustrated in Jarduli et al (2014). Preliminary differences noted above, however, suggest that it is not conspecific with E. taquari.…”

“…An unidentified species of Ernstichthys from the Rio Araguaia was reported and illustrated by Jarduli et al (2014) and hypothesized as sister group to clade E. anduzei + E. megistus (Cardoso, 2008). The photograph in Jarduli et al (2014, p. 507) shows a fish similar to E. taquari in dorsal and lateral views, but with some visible differences.…”

“…Geographically, hoplomyzontines are mostly restricted to Andean piedmonts in the western Amazon, western Orinoco, Maracaibo and Magdalena drainages in a distribution pattern called Cis-Andean Foothills (Dagosta & de Pinna, 2019). Exceptions to that pattern are the two lowland Amazonian and Orinocoan species of the genus Micromyzon (Friel & Lundberg, 1996;Carvalho et al, 2016) and a few isolated and taxonomically yet poorly understood records of Ernstichthys and "Dupouyichthys" in lower portions of Rio Madeira (Ohara & Zuanon, 2013) and of Ernstichthys in the Rio Pilcomayo in Bolivia and upper Rio Tocantins (Jarduli et al, 2014;Tiago Carvalho, pers. comm.).…”

Ictiofauna Do Ribeirão Jacubinha, Bacia Do Rio Lontra Na Cidade De Araguaína - To

“…Portanto, é possível inferir que a ictiofauna representada neste estudo reflete a distribuição e a composição da ictiofauna para bacia de drenagem e rios de cabeceiras da Bacia do Rio Araguaia-Tocantins (RAPKE et al, 2007;FERREIRA et al, 2011;JARDULI et al, 2014).…”