A new <i>Corydoras</i> Lacépède, 1803 (Siluriformes: Callichthyidae) from the rio Araguaia basin, Brazil, with comments about <i>Corydoras araguaiaensis</i> Sands, 1990

Tencatt, Luiz Fernando Caserta; Britto, Marcelo Ribeiro de

doi:10.1590/1982-0224-20150062

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Articles • Neotrop. ichthyol. 14 (01) • 2016 • https://doi.org/10.1590/1982-0224-20150062 copy

A new Corydoras Lacépède, 1803 (Siluriformes: Callichthyidae) from the rio Araguaia basin, Brazil, with comments about Corydoras araguaiaensis Sands, 1990

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

A new species of Corydoras is described from the rio Araguaia basin, Goiás, Brazil. The new species can be distinguished from its congeners by presenting the following features: infraorbital 1 with very large ventral laminar expansion; infraorbital 2 contacting compound pterotic; flanks densely covered by irregular black spots; and ventral surface of trunk densely covered by coalescent relatively well-developed platelets. It is also discussed the possibility that C. araguaiaensis comprehends a complex of species.

Keywords:
C65; Corydoradinae; Corydoras sp. "Guaraná"; Goiás State; Taxonomy

	Holotype	Low-High	Mean±SD
Standard length (mm)	44.5	23.4-45.3	-
Percents of standard length
Depth of body	43.1	40.9-45.7	42.7±1.1
Predorsal distance	49.7	48.9-54.3	51.6±1.2
Prepelvic distance	47.4	46.4-53.0	48.7 ±2.0
Preanal distance	83.1	77.7-87.2	82.7±2.0
Preadipose distance	89.0	84.9-98.8	87.9±2.9
Length of dorsal spine	22.9	21.6-30.4	26.7±2.7
Length of pectoral spine	25.4	25.2-32.8	28.7±2.1
Length of adipose-fin spine	6.1	5.2-9.3	7.5±1.0
Depth of caudal peduncle	15.1	14.6-17.2	15.9±0.7
Length of dorsal-fin base	17.1	16.8-20.1	18.2±0.9
Dorsal to adipose distance	27.0	18.0-27.0	22.0±1.9
Maximum cleithral width	30.1	28.0-31.9	30.0±1.0
Head length	44.3	43.5-48.0	45.5±1.2
Length of maxillary barbel	14.4	9.6-17.0	12.1±1.9
Percents of head length
Head depth	91.9	84.4-94.8	89.0±2.8
Least interorbital distance	34.0	31.4-36.3	33.4±1.3
Horizontal orbit diameter	20.8	19.2-24.3	22.4±1.6
Snout length	35.0	31.5-38.0	35.3±1.6
Least internarial distance	18.8	14.0-18.8	16.2±1.5

Sociedade Brasileira de Ictiologia Neotropical Ichthyology, Núcleo de Pesquisas em Limnologia, Ictiologia e Aquicultura, Universidade Estadual de Maringá., Av. Colombo, 5790, 87020-900, Phone number: +55 44-3011-4632 - Maringá - PR - Brazil
E-mail: neoichth@nupelia.uem.br

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