Four new species of giant pill-millipedes (Sphaerotheriida) are described from southern Vietnam: Sphaerobelum cattiense sp. nov., Sphaerobelum konkakinhense sp. nov., Zephronia konkakinhensis sp. nov. and Zephronia montis sp. nov. An updated generic diagnosis of Sphaerobelum Verhoeff, 1924 and a key to its species are provided.
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