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Pyura herdmani : ウィキペディア英語版 | Pyura herdmani
''Pyura herdmani'', one of two southern African species of "red bait" (or "rooiaas" in Afrikaans), is a sessile ascidian, or sea squirt, that lives in coastal waters attached to rocks or artificial structures. Sea squirts are named for their habit of squirting a stream of water from their exhalant siphons when touched at low tide. ==Description== ''Pyura herdmani'' is readily identifiable by the pointed papillae on its tunic.〔Rius, M. and Teske, P.R. (2011) A revision of the ''Pyura stolonifera'' species complex (Tunicata, Ascidiacea), with a description of a new species from Australia. Zootaxa 2754: 27-40 ISSN1175-5334; article available at: http://www.mapress.com/zootaxa/2011/f/zt02754p040.pdf〕 However, the tunic can be highly variable in terms of its morphology, which seems to depend largely on habitat type (which includes intertidal and subtidal areas, rocky and sandy substrata, sheltered and exposed sites). When growing on sandy bottoms, ''P. herdmani'' can grow a large peduncle to anchor itself into the sand.〔
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