« A commensal species associated with the burrowing heart urchin Echinocardium cordatum, living free in the sediment in the anal flow. From low in the intertidal and shallow shelf » (MBSBI). Original taxon: Mya ferruginosa.

« Shell sub-ovate, moderately convex, and white, with obsolete wrinkles ; umbo obtuse, placed mearest to one end ; front margin nearly straight. Inside glossy white ; hinge furnished with two projecting teeth, one of which is erect, the other turns inwards, and slopes downwards ; these teeth are separated by a large triangular notch that runs to the umbo. » – G. Montagu: Supplement to Testacea Britannica with Additional Plates, Exeter 1808, via BHL.

« This new species of Mya is usually covered with a thick tenaceous ferrugenous coat of argillacious earth, which must be removed to discover the real colour of the shell. It was first noticed by Mr. Laskey, and afterwards by M. H. Boys, on Belton sand, near Dunbar, in Scotland, who obligingly favoured us with specimens and remarks, by which we are informed it is a rare species. » – G. Montagu: op. cit.