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A new subgenus (Chambardicola) and species of Unionicola (Acari: Hydrachnida: Unionicolidae) from freshwater mussels from the central African Republic

Abstract The genus Unionicola Haldeman in the family Unionicolidae is distributed worldwide, with more than half of the known species recorded as parasites of freshwater mussels (Mollusca: Bivalvia). A new subgenus, Chambardicola n. subgen., is described from freshwater mussels, Chambardia wissmanni (Martens 1883), collected in the Ubangi (Oubangui) River, Central African Republic (Congo basin), Africa. The new species is Unionicola (Chambardicola) banguiensis n. sp., a unique mite with distinctive coxal plate anatomy and male genital field. This new mite extends our understanding of the morphology and biogeography of the genus in Africa. It further extends our knowledge of host selection and host-specificity among African Unionicola.