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Luidia maculata, a seven armed starfish. Most starfish have five arms that radiate from a central disc, but the number varies with the group. Some species have six or seven arms and others have 10–15 arms. [3] The Antarctic Labidiaster annulatus can have over fifty. [4]
Luidia maculata is a large starfish, up to 25 cm (10 in) in diameter. There are usually seven or eight (sometimes nine) long, slender, pointed arms and a relatively small central disc. The aboral (upper) surface is flat, with some granulations, the surface covered with flat-topped, table-like structures known as paxillae.
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.
Marthasterias glacialis is a fairly large starfish with a small central disc and five slender, tapering arms. Each arm has three longitudinal rows of conical, whitish spines, usually with purple tips, each surrounded by a wreath of pedicellariae. The background colour is variable and may be brownish or greenish-grey, tinged with yellow or red ...
Triton's trumpet, a very large gastropod mollusk, is a known predator of Acanthaster in some parts of the starfish's range. The Triton has been described as tearing the starfish to pieces with its file-like radula. [39] The small painted shrimp Hymenocera picta, a general predator of starfish, has been found to prey on A. planci at some ...
Thromidia catalai is a large starfish with five arms and a diameter of up to 70 cm (28 in), weighing up to 6 kg (13 lb). [2] The surface is covered with low tubercles, giving it a granular appearance. The arms are robust and cylindrical, not tapering much and having rounded tips.
Luidia clathrata is a large, flattish starfish, sometimes growing to a diameter of 30 cm (12 in). It has a relatively small disc and five slender arms, which are two or three times the diameter of the disc.
Labidiaster radiosus is a large starfish that can reach up to 40 cm (16 in) across, its color is variable in life, ranging from red-orange to purple and white. [3] [2] It has a round abdomen with 20-40 arms, often has a pattern of concentric circles radiating out on arms. [4]