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The Echinoderm Fauna of Ascension Island, South Atlantic Ocean

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dc.contributor.author Pawson, David L. en_US
dc.date.accessioned 2007-05-11T17:13:26Z en_US
dc.date.accessioned 2013-03-18T14:06:59Z
dc.date.available 2007-05-11T17:13:26Z en_US
dc.date.available 2013-03-18T14:06:59Z
dc.date.issued 1978-05-01 en_US
dc.identifier.citation Smithsonian Contributions to the Marine Sciences; 2 en_US
dc.identifier.issn 0196-0768 en_US
dc.identifier.uri http://hdl.handle.net/10088/1126 en_US
dc.description Files listed include high and low resolution reproductions. en_US
dc.description.abstract Two recent intertidal collecting expeditions and existing museum collections have added much to knowledge of the Ascension Island echinoderm fauna. Twenty-five species are now known from Ascension; eight are new records. One new species, Holothuria (Halodeima) manningi, and one new subspecies, Echinometra lucunter polypora, are described. Diadema ascensionis Mortensen is regarded as a subspecies of D. antillarum Philippi, and Pseudoboletia atlantica H. L. Clark is regarded as a subspecies of P. maculata Troschel. The echinoderm fauna of Ascension Island includes 8 amphi-Atlantic species, 3 western Atlantic species, 4 eastern Atlantic species, 5 circumtropical species, 4 species shared only with St. Helena, and I endemic species. There are in addition three endemic subspecies. Twelve species are shared with St. Helena, and both islands are closely similar in terms of numbers and relationships of their faunal components. Colonization of both islands by planktonic larval stages is suggested. Dendrochirotid holothurians, which lack such larval stages, are not represented at either St. Helena or Ascension. The structure of the Ascension fauna seems to have been determined by vagaries of ocean surface and subsurface currents. In contrast, Bermuda, which sits astride the Gulf Stream, has a fauna that is entirely typical of the West Indian region to the the south. en_US
dc.format.extent 12025157 bytes en_US
dc.format.extent 1870802 bytes en_US
dc.format.mimetype application/pdf en_US
dc.format.mimetype application/pdf en_US
dc.title The Echinoderm Fauna of Ascension Island, South Atlantic Ocean en_US
dc.identifier.srbnumber 14495 en_US
dc.identifier.eISSN 1943-667X en_US
dc.identifier.doi 10.5479/si.01960768.2.1
rft.jtitle Smithsonian Contributions to the Marine Sciences
rft.issue 2
rft.spage 1
rft.epage 31

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