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†Sievertsia Smith & Paul 1982
urn:lsid:organismnames.com:name:292780
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†Sievertsia Smith & Paul 1982
Smith & Paul 1982. Revision of the class Cyclocystoidea (Echinodermata). Philosophical Transactions of the Royal Society of London B Biological Sciences, 296(1083) 1982: 577-679