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Article Title

Rediscovery of Radiocentrum avalonense (Hemphill in Pilsbry, 1905) (Gastropoda: Pulmonata)

Volume

86

Issue

1

First Page

1

Last Page

12

Abstract

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