Tellina tenuis, the thin tellin, is a species of marine bivalve mollusc in the family Tellinidae.

[3] Tellina tenuis burrows in clean sand and has a large foot and two long siphons which it extends to the surface of the sediment.

[1] When the tide is out it descends to a depth of about ten centimetres but ascends to nearer the sediment surface when feeding.

At the low tide level it may be the most abundant macro-organism in the benthos[2] and may reach a density of 3000 individuals per square metre.

[4] Because of its greater exposure at low tides, T tenuis is more susceptible to harm in cold winter weather.