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183_8677 No113 heliocidaris tuberculata
Image by Kate's Photo Diary
"Strongly influenced by found objects. The creation of this work is a direct response to form."
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welded recycled steel
the real one: Heliocidaris tuberculata Brown sea urchin Echinometridae
The brown sea urchin (Heliocidaris tuberculata) is commonly found on the coast from QLD to mid NSW. It is found attached to the rock substrate either singularly or in clusters in rock pools and crevices within the lower tidal zone. It has a circular test (hard outer covering) that is symmetrical on the radial axis. The test can reach 10cm in diameter while the primary spines range to 25mm and are oval in cross-section. Close to the test the spines are a dark red-orange colour but the colour becomes lighter and more evident towards the tips of the spines.
General distribution: From Southern Queensland down to Ulladulla. Also found at Lord Howe Island and Kermandec Island.
The brown sea urchin attaches itself to the rock substrate by very powerful tube feet, which are also used as its primary source of locomotion, although the spines can also be used. The tube feet extend from the testes through small pores that run in 5 sections across the test. H. tuberculata feeds by grazing on algae and other organic matter that it pulls of rock surfaces using 5 teeth which are arranged in a ring and are operated by retractor muscles. It is not possible to determine the sex of this species by looking at it. Fertilization occurs external to the animal through mass broadcast spawning of both eggs and sperm. The closest relative of the brown sea urchin is H. erthrogramma and the two species are thought to have diverged between 3 to 5 million years ago.
www.anu.edu.au/BoZo/KioloaEcyclopaedia/metazoa/echinoderm...
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