Tellimya ferruginosa is a species of small marine bivalve mollusc in the family Lasaeidae.

Bivalves are molluscs with a body compressed between two usually similar shell valves joined by an elastic ligament.

[1] This mollusc grows to up to eight millimetres in length and has a fragile, thin glossy shell.

It is broadly oval in shape with the umbo or beak and the hinge being in the posterior half.

[2] Tellimya ferruginosa lives under the surface of the sediment and prefers muddy sand.