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Scaly file shell

Distribution : Mediterranean

A few white tentacles projecting from a crack may reveal a spiny file shell. The shell often stays sheltered, held by threads. Yet the mollusc is not permanently immobile: when unattached, it can move by beating its valves.

Habitat of Scaly file shell Habitat
Rocky habitat, Seagrass meadow
Depth range of Scaly file shell Depth
1-100 m
Biological group of Scaly file shell Group
Ecological role of Scaly file shell Role
Filter feeder

WHAT DOES IT LOOK LIKE?

The shell of Lima lima is white, oval and elongated, usually three to seven centimetres long. Eighteen to twenty-four prominent ribs radiate across the valves and carry small scales.

Long white contractile tentacles fringe the mantle, the tissue around the body. They contrast with the orange-red tentacles of the smaller flame shell, often found in comparable shelters.

WHERE DOES IT LIVE?

It occupies cracks in rock, the undersides of stones and sometimes the matte beneath Neptune grass, the accumulated roots, stems and sediment at the meadow’s base. Encounters are possible from shallow water to around a hundred metres.

The byssus, a bundle of strong threads, generally holds the animal in its shelter. Tentacles may extend while the valves remain difficult to see.

WHAT DOES IT EAT?

It eats tiny particles present in the water. This is described as microphagous feeding: food consists of very small items rather than large prey.

Sticky tentacles help collect them. Water therefore brings resources to an animal that can remain protected between stones.

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Scaly file shell

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