The First Report of a Water Mite (Trombidiformes: Unionicolidae) Infection in spp. (Gastropoda: Viviparidae) from Thailand with a Description of a New Species of () sp. nov.

Two species of gastropods, and , were found infested with water mites of the genus in Bangkok and Nonthaburi provinces, Thailand. Morphological studies on these water mites, based on the characteristics of their genital acetabular and female genital fields, identified them as a new member of subgenus . () sp. nov. was named after the first location where this parasitic water mite was discovered. This species is distinguished from others by the pattern of their female genital field, with their anterior acetabular plates each bearing two acetabula and a short thick spine on the inner margin. Additionally, it differs from other species by the structure of the spines in its pedipalps and legs, as well as in the shapes of its coxal plates.