Espécie nova de Mytilopsis Conrad, 1857, do rio Tocantins, Tucuruí, Pará, Brasil: (Mollusca, Bivalvia, Dreissenidae) / A new species of Mytilopsis Conrad, 1857, from Tocantins river, Tucuruí, Pará, Brazil: (Mollusca, Bivalvi, Dreissenidae)

A new species of Mytilopsis, mollusk bivalvi from Brazilian Amazon Region (Tocantins, Pará) is described. It is different from the American other species due small dimensions and height/width relation.