Abstract
The currently taxonomy of the genus Diplodonta Bronn, 1831 is only based on shell characters, requiring a detailed anatomic study. The taxonomic historic of this species is commonly associated at the genus Lucina (Lucinidae), taxonomic closely at the studied genus. In the Brazilian coast are recognized the species D. punctata (Say, 1822), D. nucleiformis Wagner, 1838, D. portesiana (D'Orb…