Abstract
Two mitochondrial (cytochrome oxidase subunit I, 16S RNA) and one nuclear (18S RNA) gene fragments were used to analyse relationships within the Oulimnius tuberculatus species group. The results of molecular data analysis are compared with morphological characters, and the distributional patterns and taxonomic status of recognized taxa are addressed. Based on molecular data, Oulimnius perezi is re-validated as a distinct species, and the discovery of a possible new species from northwest Italy is reported. The possible origins and times of speciation within the species group are discussed.References
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