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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]
Starfish are in some cases taken from their habitat and sold to tourists as souvenirs, ornaments, curios or for display in aquariums. In particular, Oreaster reticulatus , with its easily accessed habitat and conspicuous coloration, is widely collected in the Caribbean.
Labidiaster annulatus is found around the Antarctic Peninsula, South Georgia and the South Sandwich Islands.The depth range is from the intertidal zone down to 554 metres (1,818 ft) but this starfish most commonly occurs between 30 and 400 metres (98 and 1,312 ft).
They occur predominantly on deep-water continental shelf habitats (but a part of them inhabit shallow waters) [3] in all the world's oceans, being the most diverse in the Indo-Pacific region. [ 4 ] List of genera
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.
Patiria pectinifera, the blue bat star, is a species of starfish in the family Asterinidae. It is found in the northern Pacific Ocean along the coasts of Japan, China and Russia. It is used as a model organism in developmental biology.
The common sunstar is commonly found on rocky bottoms, coarse sand and gravel in the bathyal, infralittoral and circalittoral zone (from low-tide line up to depths of 300 m).
The Asterozoa are a subphylum in the phylum Echinodermata, within the Eleutherozoa.Characteristics include a star-shaped body and radially divergent axes of symmetry. The subphylum includes the classes Asteroidea (the starfish or sea stars), Ophiuroidea (the brittle stars and basket stars), Somasteroidea (early asterozoans from which the other classes most likely evolved), and Stenuroidea ...