Peces Criollos - Freshwater Fishes of Argentina Peces Criollos - Freshwater Fishes of Argentina
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Cnesterodon pirai sp.nov.

Cnesterodon pirai
Cnesterodon pirai (photo: from publication)

new species:
Cnesterodon pirai Aguilera, Mirande & Azpelicueta, 2009

remark:
Zootaxa has cut the respective last vocal from the family names of all three authors. The paper was published with authorship 'Aguiler, Mirand & Azpelicuet'. It should have been published as 'Aguilera, Mirande & Azpelicueta'. An erratum has been published later.

published in:
Aguilera, G., J.M. Mirande & M. Azpelicueta (2009):
A new species of Cnesterodon (Cyprinodontiformes: Poeciliidae) from a small tributary of arroyo Cuñá-Pirú, río Paraná basin, Misiones, Argentina.
Zootaxa 2195: 34-42

abstract (from publication):
Cnesterodon pirai new species is described from a small stream, tributary of the arroyo Cuñá-Pirú, río Paraná basin in Argentina. The new species is diagnosed by the following combination of characters: 6 to 8 irregular dashes, ranging from oval to vertical stripes on females and 7 to 9 irregular dashes ranging from oval to circular dots on males; lack of a distal membranous filament on the terminal appendix of ray 3 of the gonopodium; absence of longitudinal dark-brown band along flank; snout long (16.7–28.7 % HL) and pointed; absence of a large post-gonopodium blotch on ventral profile in adult males; absence of dashes along predorsal portion of first, second and third lateral series of scales, associated to the vertical bars on body side; 12–13 epipleural ribs; medial surface of ascending process of premaxilla approximately straight; presence of teeth on fourth ceratobranchial; distal portion of third and fourth gonactinosts separate, except by tip of third gonactinost; fifth gonactinost free; and presence of a constriction on unpaired appendix of gonopodium. In a phylogenetic analysis the new species forms a tricotomy with (Cnesterodon brevirostratus + C. septentrionalis) and (C. hypselurus + C. iguape).

distribution & habitat (from publication):
Cnesterodon pirai is only know from its type locality, arroyo Almeida, affluent of arroyo Cuñá-Pirú, río Paraná basin, Aristóbulo del Valle, Misiones, Argentina. In spite of the collecting effort in different streams of Misiones province, especially in the Cuñá-Pirú basin, C. pirai was not found in other sites.
The stream where the new species lives is narrow (2 m wide on its widest section) and shallow, with falls about 80 cm depth, and moderately slow current. It is a tributary of the Cuña-Pirú stream (above Salto Encantado, a fall with 40 m depth); the creek only has 700 m from its headwaters to the confluence with Cuñá-Pirú. The rocky stream bed, covered by detritus over 50% of its surface, presents small pools and glides. Cnesterodon pirai was especially found forming schools of juveniles and adults in pools.
 

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