Abstract
A new species of Corydorasis described from three tributaries of the rio Ivaí drainage, upper rio Paraná basin, Paraná State, Brazil. The new species can be distinguished from most of its congeners by the presence of three nasal pores. Other diagnostic features are the lower number of serrations in posterior margin of pectoral and dorsal spines and presence of four to six small black blotches along the midline of the flank. The possible mimetic relationship between the new species and Characidium heirmostigmatais discussed.
Highlights
Corydoras Lacépède, 1803 is the most species-rich genus of Siluriformes, currently with about 170 nominal species (Eschmeyer, 2013)
All collected in Brazil, Paraná State, Cândido de Abreu, rio Ivaí basin, except when noticed
C. garbei presents a very developed anterior expansion of infraorbital 1, which is only moderately developed in Corydoras lacrimostigmata
Summary
Corydoras Lacépède, 1803 is the most species-rich genus of Siluriformes, currently with about 170 nominal species (Eschmeyer, 2013). Despite of some attempts performed in the last 40 years to elucidate the taxonomy and systematics of the group (e.g., Nijssen, 1970; Nijssen & Isbrücker, 1980; Britto, 2003; Alexandrou et al, 2011), interrelationships of Corydoras species are still poorly known (Britto et al, 2007). Four valid Corydoras species could be recognized from upper rio Paraná basin: C. aeneus (Gill, 1858), C. difluviatilis Britto & Castro, 2002, C. ehrhardti Steindachner, 1910 and C. flaveolus Ihering, 1911. Analyses from samples collected by Nupélia staff (Núcleo de Pesquisas em Limnologia, Ictiologia e Aquicultura, Universidade Estadual de Maringá) from rio Ivaí drainage reveals a new species of Corydoras, which is described
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