CW083 = Corydoras caramater, new species

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CW083 = Corydoras caramater, new species

Post by bekateen »

CW083 = , new species

Tencatt LFC, Couto OLP, Santos SA, Sousa LM. 2024. A new long-snouted Corydoras (Siluriformes: Callichthyidae) from the rio Xingu and rio Tapajós basins, Brazilian Amazon. Neotrop. Ichthyol., 22(1):e230112. https://doi.org/10.1590/1982-0224-2023-0112

https://doi.org/10.1590/1982-0224-2023-0112
https://www.scielo.br/j/ni/a/D8mmKv6gDp ... R/?lang=en
Abstract
A new species of Corydoras is described from the rio Xingu and rio Tapajós basins, Pará State, Brazil. The new species can be promptly distinguished from its congeners by the combination of the following features: (I) temporal sensory canal at sphenotic with two pores; (II) upper tooth plate of branchial arch with three or four series of teeth; (III) area at the corner of the mouth, ventral to the maxillary barbel, with a small, roughly triangular fleshy flap, not forming an elongated barbel-like structure; (IV) contact between posterior process of the parieto-supraoccipital and nuchal plate; (V) dark stripe transversally crossing the orbit, forming a mask-like blotch; (VI) absence of a distinct color pattern along midline of flank; (VII) dorsolateral body plates only with small, irregular, rounded or vertically elongated dark brown or black blotches; ground color of plates typically dusky but not forming large, conspicuous black patches; and (VIII) absence of a relatively large, conspicuous dark patch on anterior portion of dorsal fin.
Keywords: Corydoradinae; Corydoras sp. CW83; Jacareacanga; Taxonomy; Volta Grande do Xingu
Resumo
Uma espécie nova de Corydoras é descrita das bacias do rio Xingu e do rio Tapajós, Estado do Pará, Brasil. A espécie nova pode ser prontamente diferenciada de suas congêneres pela combinação das seguintes características: (I) canal sensorial temporal no esfenótico com dois poros; (II) placa dentária superior do arco branquial com três ou quatro séries de dentes; (III) área no canto da boca, ventralmente ao barbilhão maxilar, com pequena aba carnosa algo triangular, não formando uma estrutura alongada similar a um barbilhão; (IV) contato entre o processo posterior do parieto-supraoccipital e a placa nucal; (V) faixa escura cruzando transversalmente a órbita, formando uma mancha em forma de máscara; (VI) ausência de um padrão de coloração distinto ao longo da linha mediana do flanco; (VII) placas dorsolaterais do corpo apenas com manchas pequenas, irregulares, arredondadas ou alongadas verticalmente, marrom-escuras ou pretas; cor de fundo das placas tipicamente escura, mas não formando manchas pretas grandes e conspícuas; e (VIII) ausência de uma mancha escura relativamente grande e conspícua na porção anterior da nadadeira dorsal.
Palavras-chave: Corydoradinae; Corydoras sp. CW83; Jacareacanga; Taxonomia; Volta Grande do Xingu
Attachments
FIGURE 2. Two preserved specimens of Corydoras caramater, showing general color and morphological patterns in lateral view of (A) a paratype (LIA 8170, 38.1 mm SL), and (B) a non-type specimen from the rio Tapajós basin (CPUFMT 8149, 1, 49.9 mm SL). (CC-BY-4.0)
FIGURE 2. Two preserved specimens of Corydoras caramater, showing general color and morphological patterns in lateral view of (A) a paratype (LIA 8170, 38.1 mm SL), and (B) a non-type specimen from the rio Tapajós basin (CPUFMT 8149, 1, 49.9 mm SL). (CC-BY-4.0)
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