Rediscovery of Radiocentrum avalonense (Hemphill in Pilsbry, 1905) (Gastropoda: Pulmonata)
Hochberg , F. G.
Miller, Walter B.
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The land snail species originally described as Oreohelix avalonensis <br /><br />Hemphill in Pilsbry, 1905, was rediscovered on Santa Catalina Island, California, <br /><br />after being "lost" for nearly 80 years since its original collection. It is narrowly <br /><br />distributed on south-facing slopes on the southeastern part of the island, in as- <br /><br />sociation with a coastal sage scrub plant community. Dissection of the reproduc- <br /><br />tive system confirms placement in the oreohelicid genus Radiocentrum. Disjunc- <br /><br />tions in the range of Radiocentrum correspond to the arid environments of the <br /><br />Sonoran and Chihuahuan deserts and probably date from late Pleistocene time. <br /><br />A lectotype is designated for the species.