Donax denticulatus (Linneaus, 1758)

Strong, solid, about 2.5 cm in length. The color is variable - shades of cream, brown, purple and grey with fine radiating brown or purple rays. There may also be concentric rings of white, purple or brown. There are also numerous fine radiating ribs usually white but sometimes tinted with brown or purple. The apex is usually purple as is the inside of the shell. In the left valve, the anterior cardinal tooth is bifid, but in the right valve it is the posterior one which is bifid. This bifurcation cannot be seen in worn specimens. There are 2 anterior and 2 posterior lateral teeth in the right valve, but only one of each in the left valve. The inner margin is crenulated or toothed. The pallial sinus reaches to the midline and is deeper than in D. striatus, from which species it can also be distinguished by the presence of 2 curved ridges on the posterior slope, D. striatus only having one.