Iphigenia brasiliensis (Lamarck, 1818) – Giant False Donax 

The Iphigenia Brasiliensisis very similar in shape and color to the D. denticulatus specimen, but is much thicker and larger, growing up to 7.5 cm. It has prominent beaks that are usually tinged with purple. The inside of the shell varies from buff to dark grey depending on the color of the outside of the shell. The lateral teeth are absent. In the left valve the anterior one is bifid but in the right valve the posterior one is, in worn specimens this bifurcation cannot usually be seen. At the posterior end there is a slight indentation in the ventral margin. The surface is smooth except for irregular growth lines, and the inner margin is not crenulated or toothed. The pallial sinus is very large and stretches past the midline. The periostracum is thin and brown. It lives in shallow or brackish water and is fairly common.