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Choriaster granulatus is a large sea star with a convex body and five short arms. The arms have rounded tips, making it appear "phallic", leading to one of its common names being "the doughboy starfish". Relatively large in comparison with other sea stars, its maximum radius is about 27 centimetres (11 in).
The background colour is variable and may be brownish or greenish-grey, tinged with yellow or red and sometimes with purple at the tips of the arms. This species can grow to 70 cm (28 in) but a more usual size is 25 to 30 cm (10 to 12 in). It is sometimes confused with the northern starfish Leptasterias muelleri. [3]
The rainbow star is a large starfish, growing to a diameter of about 50 centimetres (20 in) with an arm length of 21 centimetres (8.3 in). It usually has five slender tapering arms and the aboral (upper) surface is pink or red with irregular patches or bands of darker red, orange or grey.
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.
This coralline alga is rich in calcium which is beneficial for the young starfish and its skeletal growth. [6] After this stage, the diet of S. australis shifts to include, but is not limited to, P. canaliculus. The starfish, as it increases in size to about 2 to 2.5 cm in diameter and begins to mature, will then solely feed on the mussels.
Female starfish produce large numbers of oocytes that are easily isolated; these can be stored in a pre-meiosis phase and stimulated to complete division by the use of 1-methyladenine. [125] 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 ...
By comparison, a specimen of the ten-armed Luidia magnifica from Hawaii had a radius of 38 centimetres (15 in) and the nine-armed Luidia savignyi at 37 centimetres (15 in) was the largest known starfish at the time at which it was measured. [2]
Oreaster reticulatus, commonly known as the red cushion sea star or the West Indian sea star, is a species of marine invertebrate, a starfish in the family Oreasteridae. It is found in shallow water in the western Atlantic Ocean and the Caribbean Sea.