Özet:

Abstract Here, we describe Contradens novoselovi sp. nov. (Bivalvia: Unionidae), a new freshwater mussel species from the Mekong Basin in Laos. Phylogenetic and morphological analyses reveal that the new taxon is closely related to Contradens comptus (Deshayes & Jullien, 1874) but can be distinguished from it by a smaller size, sub-ovate shell shape, tiny wrinkles near umbo, stronger pseudocardinal and lateral teeth, and fixed nucleotide substitutions. Contradens novoselovi sp. nov. is known only from the type locality in northwestern Laos and may represent a rare endemic species with restricted range. References Bolotov, I., Vikhrev, I., Bespalaya, Y., Artamonova, V., Gofarov, M., Kolosova, J., Kondakov, A., Makhrov, A., Frolov, A., Tumpeesuwan, S., Lyubas A., Romanis, T. & Titova, K. (2014) Ecology and conservation of the endangered Indochinese freshwater pearl mussel, Margaritifera laosensis (Lea, 1863) in the Nam Pe and Nam Long rivers, Northern Laos. Tropical Conservation Science, 7(4), 706–719.

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