A new species of Poecilia from the Atlantic slopes of Honduras is described and assigned to the subgenus Mollienesia. Poecilia hondurensis, new species, differs from all congeners in the combination of having tricuspid teeth on the inner of both jaws and lacking a prominent spine or hook on the gonopodium. Eleven geographically close congeners are treated in some detail, and a key is provided to identify all species occurring south of Mexico.

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