The land snail genus Opisthoporus Benson in L. Pfeiffer, 1851 (Gastropoda: Caenogastropoda: Cyclophoridae) from Vietnam, with description of a new species 

Do Duc Sang1*, Bui Thi Chinh2 & Do Van Nhuong3

1 Department of Applied Zoology, Faculty of Biology, Hanoi University of Science (Vietnam National University, Hanoi), 334 Nguyen Trai, Thanh Xuan, Hanoi, Vietnam; Email: do.ducsang@hus.edu.vn (*corresponding author)

2 Faculty of Biology, Hue University of Education, Hue University, 34 Le Loi, Hue, Vietnam

3 Faculty of Biology, Hanoi National University of Education, 136 Xuan Thuy, Dich Vong, Cau Giay, Ha Noi, Vietnam

Abstract. 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. Opisthoporus thuathienhuensis, 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.
Key words. systematics, limestone hill, breathing tube, Thua Thien Hue, Vietnam

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