The land snail genus Pincerna Preston, 1907 (Gastropoda: Alycaeidae) from Vietnam and Laos, with description of a new species

Pincerna Preston, 1907 is an Asian land snail genus, which is currently classified in the family Alycaeidae Blanford, 1864, in the superfamily Cyclophoroidea Gray, 1847. Five species of Pincerna are recognised in Vietnam and Laos, including Pincerna anceyi (Mabille, 1887), Pincerna costulosus Bavay & Dautzenberg, 1912, Pincerna mouhoti (L. Pfeiffer, 1862), Pincerna vanbuensis (Bavay & Dautzenberg, 1900), and Pincerna clausa, new species, from a limestone hill in Di.n Bien Province, northwestern Vietnam. Pincerna clausa is most similar to Pincerna vanbuensis, but differs in having a closed umbilicus, stronger spiral striation on protoconch region R1, and weaker ribs on R2.