A New Species of Corydoradinae Catfish (Ostariophysi: Siluriformes: Callichthyidae) from Rio Solimões Basin, Brazil

Abstract

A new species of Corydoras from the Rio Urucu basin, a right-bank tributary of the Rio Solimões is described. The new species shares a distinctive pigmentation pattern with Corydoras arcuatus, C. gracilis, and C. narcissus, composed of a uniform light ground color on the body, and a dark, arched stripe from tip of snout to caudal-fin base along the upper portion of the dorsolateral body plates. The new species is readily distinguished from these congeners by the absence of a continuation of the arc-like stripe onto the snout. It also differs from Corydoras gracilis and C. narcissus by the posterior part of the arc-stripe reaching the base of the lower caudal-fin rays, and from C. arcuatus and C. narcissus by the distinctly rounded profile of the snout in lateral view, a greater preadipose distance, and the position of the posterior limit of the cleithrum. Despite the general resemblance, investigation about the position of the new species in light of previous phylogenetic hypotheses concerning this subfamily indicates that the arc-striped coloration pattern was independently acquired.Uma nova espé cie de Corydoras da bacia do Rio Urucu, um afluente da margem direita do Rio Solimões, é descrita. A nova espé cie compartilha um padrão de pigmentação com Corydoras arcuatus, C. gracilis, e C. narcissus, composto de colorido claro e uma faixa escura em arco da extremidade do focinho a base da nadadeira caudal atravé s da porção superior das placas dorsolaterais do corpo. A nova espé cie é prontamente distinta destas congêneres pela ausência de continuação da faixa se estendendo até o focinho. També m se distingue de Corydoras gracilis e C. narcissus pela extremidade posterior da faixa em arco alcançar a base dos raios inferiores da nadadeira caudal, e de C. arcuatus e C. narcissus pelo perfil do focinho distintamente arredondado em vista lateral, pela maior distância pré -adiposa, e pela posição do limite posterior do cleitro. Apesar da semelhança, investigações sobre a posição da nova espé cie a luz de hipó teses filogené ticas pré vias sobre a subfamília, indicam que o padrão de colorido com uma faixa em arco foi adquirido independentemente.

Redescription of Corydoras guapore Knaack, 1961 (Siluriformes: Callichthyidae), a midwater Corydoradinae species from the rio Guaporé basin

“…Britto et al, 2009;Alexandrou et al, 2011). The color pattern of C. guapore is very similar to that observed in three known species, C. caudimaculatus also from the rio Guaporé basin, C. ourastigma from the rio Purus basin and C. similis Hieronimus, 1991 from the rio Madeira basin.…”

“…The supra-preopercle sensu Huysentruyt & Adriaens (2005) will be treated here as a part of the hyomandibula according to Vera-Alcaraz (2013). Vertebral counts follow Britto et al (2009).…”

A new species of Aspidoras (Siluriformes: Callichthyidae) from a small coastal drainage in northeastern Brazil

“…The suprapreopercle sensu Huysentruyt, Adriaens (2005) is treated here as a part of the hyomandibula according to Vera-Alcaraz (2013). Vertebral counts follow Britto et al (2009). Frequencies of counts are given in parentheses in the text, and an asterisk indicates values for the holotype.…”

Two new species of Corydoras Lacépède, 1803 (Siluriformes: Callichthyidae) from the rio Madeira basin, Brazil

“…urucu Britto, Wosiacki &Montag, 2009. Photographs of other pertinent type specimens were available for examination via the All Catfish Species Inventory website (Morris et al, 2006).…”

“…narcissus Nijssen &, two species with almost equal color pattern, into two different morphological groups, and noting that C. narcissus is more similar to C. acutus Cope, 1872 than to C. arcuatus. Britto et al (2009) later described a third species with very similar color pattern to C. arcuatus and C. narcissus and showed that all three species belong to distinct clades. Based on phylogenetic analyses, Britto (2003) noted another case of apparent color convergence involving Corydoras nattereri Steindachner, 1876 in the Corydoras clade and C. prionotos in the Scleromystax clade.…”