Named for its smooth, silky shell, which lacks the strong rings of its relative the ringed dosinia. A clam that is a tiny treasure. The shell is small, flat and almost perfectly circular, often with a delicate pinkish colouration. The surface is smooth and glossy, like polished porcelain. It is the smallest of the dosinia species in New Zealand waters. A shell that fits on a fingertip. It lives buried in the sand of sheltered bays and estuaries. The silky texture of the shell is an adaptation to burrowing. A smooth shell moves more easily through the sand than a rough one. The clam can burrow quickly, disappearing into the sediment within seconds of being disturbed. Its small size means it is not collected for eating. The flesh is tiny, barely a crumb. It would take hundreds of silky dosinias to make a meal, and the effort of digging them from the sand is not worth the reward. But its beautiful shell is prized by collectors. It is often found washed up on beaches after storms, where its delicate shell catches the eye of beachcombers. The shell is fragile and easily broken, so a complete specimen is a lucky find. The pinkish colouration fades in the sun, so a freshly washed-up shell is the most prized. The silky dosinia is a clam of the sheltered bay, a small resident of the sand flats. The sheltered bay is calm. The silky dosinia buries in the sand, smooth and glossy, filtering water. The storm passes. The shell washes up on the beach, pinkish and perfect. A beachcomber picks it up. It is a treasure. The clam does not know it is prized. It does not know it is a collector's item. It just wanted to filter water. A tiny cog in the great machine of the estuary. Without the silky dosinia and its countless relatives, the estuary would be a poorer place. The silky dosinia is proof.