Cnesterodon pirai, the Almeida toothcarp, is a species of poeciliid that is only know from its type locality, the arroyo Almeida, an affluent of the arroyo Cuñá-Pirú, in the Río Paraná basin, Aristóbulo del Valle, Misiones in Argentina.

[1] This species reaches a length of 2.8 cm (1.1 in) TL.

[2] The species name meaning is pirá, a Guarani word for fish and the í diminutive, referring to the small size of the fishes in this genus.

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