original description(ofCyclostoma (Cyclophorus) thersites Shuttleworth, 1852)Shuttleworth, R. J. (1852). Diagnosen neuer Mollusken. <em>Mittheilungen der Naturforschenden Gesellschaft in Bern.</em> 1852 (260/261): 289-304. Bern. page(s): 299, 300 [details]
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