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Noble coral
The noble coral, ''Stylaster nobilis'', is a branching colonial hydroid in the family Stylasteridae.〔http://marinespecies.org/aphia.php?p=taxdetails&id=210735 accessed 15 August 2013〕 ==Description==
Noble corals are pink or orange and tree-like with paler tips to the colony's branches. The calcareous colonies may grow to over 25cm in total height, while individual polyps are 0.1cm in diameter.〔Branch, G.M., Branch, M.L, Griffiths, C.L. and Beckley, L.E. 2010. ''Two Oceans: a guide to the marine life of southern Africa'' ISBN 978-1-77007-772-0〕 There is no free medusa stage. The polyps project from star-shaped cavities in the rigid calcareous skeleton. Growth occurs at the tips and on the outside surface, which gradually thickens and which may show concentric rings in section.
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