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Occasionally aberrant individuals developed with the wrong number of arms or with limbs in the wrong place. [8] Parasitic snails are sometimes found in or on the body of this starfish. [7] The snail Stylifer linckiae in the family Eulimidae has been shown to be a parasite by its uptake of materials from the seastar. [9]
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]
Starfish oocytes are well suited for this research as they are large and easy to handle, transparent, simple to maintain in sea water at room temperature, and they develop rapidly. [126] Asterina pectinifera , used as a model organism for this purpose, is resilient and easy to breed and maintain in the laboratory.
Labidiaster annulatus has a wide central disc and 40 to 45 long narrow rays and can reach a diameter of 60 centimetres (24 in). [2] The disc is slightly inflated and is raised above the base of the rays. The madreporite is large and near the edge of the disc. The aboral or upper surface is covered in a meshed network of small slightly ...
Pisaster giganteus, the giant sea star, giant spined star, or knobby sea star is a species of sea star that lives along the western coast of North America from Southern California to British Columbia.
The genus Linckia, as is true of other species of starfish, is recognized by scientists as being possessed of remarkable regenerative capabilities, and endowed with powers of defensive autotomy against predators: [citation needed] Although not yet documented, L. laevigata may be able to reproduce asexually, as does the related species Linckia ...
They feed primarily on small crabs, though chitons, snails, clams, barnacles, brittle stars, and urchins have also been found in the diet. Their method of feeding is unique among sea stars.
Aboral surface of an Asterias forbesi sea star showing ring of pedicellariae surrounding spine. Asterias, like most starfish genera in the order Forcipulatida, are recognisable externally by their pedicellariae, many thousands of tiny jaw-like structures on the skin which can snap shut to nip at prey or predators.