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Underside of a sunflower sea star. Sunflower sea stars can reach an arm span of 1 m (3.3 ft). They are the heaviest known sea star, weighing about 5 kg. [4] They are the second-biggest sea star in the world, second only to the little known deep water Midgardia xandaros, whose arm span is 134 cm (53 in) and whose body is 2.6 cm (roughly 1 inch) wide. [7]
The starfish body plan consists of five to six arms radiating from a central disk. Regenerative ability differs greatly among starfish species, but can generally be classified within three categories: unidirectional regeneration, disk-dependent bidirectional regeneration, and disk-independent bidirectional regeneration.
Solaster dawsoni attacking a spiny red sea star, Hippasteria spinosa An adult specimen of Solaster dawsoni afflicted by the Sea star wasting disease off Vancouver. The morning sun star is a predator, feeding mostly on other starfish. It is feared by other stars which move away as fast as they can if touched by a morning sun star.
The starfish have a flat, star-shaped body with five elongated triangular arms, according to experts. The creatures are covered with “dense” granules forming a “smooth, almost featureless ...
Sunflower seastar regenerating missing arms. Some species of starfish have the ability to regenerate lost arms and can regrow an entire new limb given time. [48] A few can regrow a complete new disc from a single arm, while others need at least part of the central disc to be attached to the detached part. [22]
Sea urchin tube feet extended past the spines.. Tube feet (technically podia) are small active tubular projections on the oral face of an echinoderm, such as the arms of a starfish, or the undersides of sea urchins, sand dollars and sea cucumbers; they are more discreet though present on brittle stars, and have only a feeding function in feather stars.
Sea star wasting disease or starfish wasting syndrome is a disease of starfish and several other echinoderms that appears sporadically, causing mass mortality of those affected. [1] There are approximately 40 species of sea stars that have been affected by this disease.
This family contains many species of regular starfishes with usually 5 arms around a stiff, convex and often brightly colored body. Whereas some species are very easy to identify, like the "pincushion seastars" (Culcita sp.), some other can be difficult to tell apart.
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