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High-spined commensal hydroid : ウィキペディア英語版 | High-spined commensal hydroid
The high-spined commensal hydroid, ''Hydractinia altispina'', is a small colonial hydroid in the family Hydractiniidae.〔http://marinespecies.org/aphia.php?p=taxdetails&id=284838 accessed 13 August 2013〕 ==Description== High-spined commensal hydroids grow as a fuzzy-looking orange coat usually on the shell of a marine snail, the scaly dogwhelk ''Nucella squamosa''. Individual polyps grow to 0.4cm in total height. The polyps are naked and cluster on the shell surface, interspersed with defensive spines and tiny ball-like reproductive structures. 〔Millard, N.A.H. 1975. Monograph on the Hydroida of Southern Africa. ''Ann. S. Afr. Mus.'' 68:1-513〕
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