Species of the genus Opisthoporus Benson in L. Pfeiffer, 1851 (family Cyclophoridae) occurring in Vietnam are reviewed and presented. In total, three species are included: Opisthoporus beddomei Dautzenberg & Fischer, 1908; O. lubricus Dautzenberg & Fischer, 1908; and O.thuathienhuensis, new species. Opisthoporusthuathienhuensis, new species, differs most distinctly from related congeners by its small inverted U-shaped breathing tube that has its distal end touching the last whorl. The new species is known only from limestone hills of Thua Thien Hue Province, central Vietnam, where terrestrial gastropod fauna is diverse, but relatively poorly known. This discovery represents the first record of the genus Opisthoporus in central Vietnam. A checklist of Opisthoporus taxa (mainly literature data) is presented.

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 Điện Biên 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.

The final instar larva of Leptogomphus risi Laidlaw is described and illustrated for the first time based on an exuvia collected from Singapore. A comparison of this larva with known larvae of congeners is discussed, including a first description of the larva of Leptogomphus williamsoni Laidlaw from Sarawak.