Corydoras tukano, a new species of corydoradine catfish from the rio Tiquié, upper rio Negro basin, Brazil (Ostariophysi: Siluriformes: Callichthyidae)

Abstract

A new Corydoras species from the rio Tiquié, upper rio Negro system, Amazonas, Brazil, is described. This taxon was previously referred to as "Corydoras species 'Asher'", "Corydoras cf. reynoldsi", and "Corydoras aff. reynoldsi" in the aquarist literature. The new taxon can be distinguished from all its congeners, except Corydoras reynoldsi and C. weitzmani, by its color pattern, consisting of three large, dark blotches, the first one ("mask") on the head, across the eye; the second one on the trunk at the level of dorsal fin; and the third one on the trunk at the level of the adipose fin. It can be distinguished from Corydoras reynoldsi mainly by the development of trunk blotches; and from C. weitzmani by the presence of a dusky saddle between the dorsal and adipose fins, the second trunk blotch extending vertically from the adipose-fin base to the anal-fin base, and the presence of four dark stripes in the caudal fin.Uma nova espécie de Corydoras do rio Tiquié, bacia do alto rio Negro, estado do Amazonas, Brasil, é descrita. Este táxon foi anteriormente citado na literatura aquarista como "Corydoras species 'Asher'", "Corydoras cf. reynoldsi" e "Corydoras aff. reynoldsi". O novo táxon pode ser distinguido de todos seus congêneres, exceto Corydoras reynoldsi e C. weitzmani, por seu padrão de colorido, que consiste em três grandes manchas pretas, a primeira ("máscara") na cabeça, através do olho; a segunda no tronco, no nível da nadadeira dorsal; e a terceira no tronco, no nível da nadadeira adiposa. Ele pode ser distinguido de Corydoras reynoldsi principalmente pelo desenvolvimento das manchas do tronco, e de C. weitzmani pela presença de uma mancha escura na porção dorsal das placas dorsolaterais, entre a nadadeira dorsal e a nadadeira adiposa, pela segunda mancha estender-se verticalmente da base da nadadeira adiposa até a base da nadadeira anal, e pela presença de quatro listras pretas na nadadeira caudal.

Corydoras ortegai, a new species of corydoradine catfish from the lower río Putumayo in Peru (Ostariophysi: Siluriformes: Callichthyidae)

“…In the original description of Corydoras tukano, Britto & Lima (2003) indicated the presence of a unique color pattern shared between this species, Corydoras reynoldsi, and C. weitzmani. That pattern is composed of light ground coloration on body, presence of a dark bar ("mask") across the orbit, and two large, dark blotches midlaterally on trunk, one at the level of dorsal fin, and a second at the level of adipose fin.…”

“…Osteological terminology follows Reis (1998a), except by "parieto-supraoccipital" instead of "supraoccipital" (Arratia & Gayet, 1995), "compound pterotic" instead of "pterotic-supracleithrum" (Aquino & Schaefer, 2002), and "scapulocoracoid" instead of "coracoid" (Lundberg, 1970). Homology of barbels follows Britto & Lima (2003). Institutional abbreviations are according to Reis et al (2003).…”

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

“…Morphometrics are reported as percentages of standard length (SL) and head length (HL). Homology and terminology of barbels follows Britto & Lima (2003). For our osteological analysis, some specimens were cleared and stained (c&s) following the protocol of Taylor & Van Dyke (1985).…”

“…tukano Britto &Lima, 2003; flanks densely covered by small rounded black spots, which can be diffuse or absent in some specimens, in C. albolineatus Knaack, 2004 andC. potaroensis Myers, 1927; a single oblique black stripe from dorsal-fin base region descending to base of caudal peduncle in C. melini Lönnberg & Rendahl, 1930; four to six longitudinal rows of black spots on flanks, which may be coalescent and form stripes in some specimens of C. sterbai Knaack, 1962; presence of a single arched black stripe on dorsal portion of flank in C. urucu; absence of stripes on flanks in remaining species).…”

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

“…Morphometrics are reported as percents of standard length (SL) and head length (HL). Homology of barbels follows Britto & Lima (2003). Specimens were cleared and stained (c&s) following the protocol of Taylor & van Dyke (1985).…”