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Basket star

Distribution : Mediterranean · Atlantic Ocean

Natural history literature frequently describes the Mediterranean basket star as highly sensitive to light, rapidly folding its arms when illuminated. This description is sometimes presented as a universal rule. Yet withdrawal is not necessarily systematic: an individual may remain extended under artificial lighting. You may therefore encounter behaviour that differs from the published description. Sensitivity to light and the conditions that actually trigger arm withdrawal are not quite the same thing.

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Habitat of Basket star Habitat
Sand, Rocky habitat, Coralligenous habitat
Depth range of Basket star Depth
50-800 m
Biological group of Basket star Group
Ecological role of Basket star Role
Filter feeder

Average size

Ø 13 cm

WHAT DOES IT LOOK LIKE?

The net-like form of the basket star (Astrospartus mediterraneus) is clearest when spread: from the central disc, the arms divide at each fork down to fine curled tips. The whole takes on an almost circular shape.

Folded, those same arms form a compact tangle, hiding much of the disc. White, cream, beige and grey give the animal its generally pale appearance.

WHERE DOES IT LIVE?

It lives attached to elevated supports such as sea fans, sponges or other coralligenous structures. It is generally encountered in deep areas exposed to steady currents that bring its food.

WHAT DOES IT EAT?

The basket star’s net is alive: each arm divides into branches whose mobile tips retain small planktonic prey and organic particles. Little hooks help secure food while the arm tips curl around animals encountered. Food is not all sent towards the mouth immediately. Collection precedes arm coiling, which brings the meal towards the central disc. Feeding can be read in two stages: a widely spread network followed by progressive folding that transports the food.

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Basket star

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