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The common starfish, common sea star or sugar starfish (Asterias rubens) is the most common and familiar starfish in the north-east Atlantic. Belonging to the family Asteriidae, it has five arms and usually grows to between 10–30 cm across, although larger specimens (up to 52 cm across) are known. The common starfish is usually orange or ...
This group includes the cushion stars, [113] the leather star [114] and the sea daisies. [115] Velatida (4 families, 16 genera, 138 species) [116] This order of starfish consists mostly of deep-sea and other cold-water starfish often with a global distribution. The shape is pentagonal or star-shaped with five to fifteen arms.
The superomarginal plates are usually grey or beige homogeneous. This is the largest species of Astropecten in the Mediterranean Sea, with a maximum diameter of 55 centimetres (22 in), although it usually measures about 30 cm (12 in). It is a starfish with a lot of features and can be distinguished easily from the other species by colour and size.
Asterias is a genus of the Asteriidae family of sea stars. It includes several of the best-known species of sea stars, including the common starfish, Asterias rubens, and the northern Pacific seastar, Asterias amurensis. The genus contains a total of eight species in all.
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]
These sea stars are similar one to each other and it can be difficult to determine with certainty the species only from a photograph. To have a certain determination, in some cases, animals should be analyzed in the laboratory or using genetic testing, but often it isn’t possible. In order to determine the species, with a reasonable margin of ...
The mottled star is a large starfish with a radius of up to 28 centimetres (11 in). It has a small disc and five long narrow arms often turned up at the tip. The widest point of the arms is a little distance away from the edge of the disc.
Astropecten polyacanthus, the sand sifting starfish or comb sea star, is a sea star of the family Astropectinidae. It is the most widespread species in the genus Astropecten, found throughout the Indo-Pacific region. The armspread is up to 20 cm (8 in). [2] The specific epithet "polyacanthus" comes from the Latin meaning "many thorned". [3]