Nova espécie de Heleobia (Rissooidea, Hydrobiidae) da planície costeira do sul do Brasil

Abstract

New species of Heleobia (Rissooidea, Hydrobiidae) from south plain coast of Brazil. Heleobia robusta, new species from plain coast of Rio Grande do Sul, Brazil, is described. Conchology, conchometry, soft-part morphology including head-food, pallial structures, radula and some aspects of the female and male reproductive systems are provided.