Dioryx requiescens (Mabille, 1887)
Alycaeus requiescens Mabille, 1887: 151, pl. 3, figs 11, 12.
Alycaeus (Alycaeus) requiescens - Kobelt 1902: 349.
Dioryx requiescens - Páll-Gergely et al. 2017: 10.
Type locality.
“Tonkin” (from the title).
Material examined.
Tonkin, leg. Balansa 1887, MNHN-IM-2000-31787 (8 syntypes).
Remarks.
Shell shape typical Dioryx ; apex relatively elevated, matte; R1 with irregular, widely spaced, low ribs and very slightly stronger, dense spiral striation, which is the strongest on the first whorl of R1; R2 long, with dense alternating lighter/narrow and darker/thicker stripes; overall surface smooth.