Spiraculum sp.

Inkhavilay, Khamla, Sutcharit, Chirasak, Bantaowong, Ueangfa, Chanabun, Ratmanee, Siriwut, Warut, Srisonchai, Ruttapon, Pholyotha, Arthit, Jirapatrasilp, Parin & Panha, Somsak, 2019, Annotated checklist of the terrestrial molluscs from Laos (Mollusca, Gastropoda), ZooKeys 834, pp. 1-166 : 1

Spiraculum sp.

Material examined.

Specimens from Ban Phone Can village, Yommalath District, Khammouan Province (Figs 13C, 18D).

Remarks.

These specimens differ from Spiraculum massiei and S. vilvensi from Laos and Pterocyclos huberi Thach, 2015, S. franzhuberi (Thach, 2017) and S. thachi (Huber in Thach, 2017) from Vietnam in having a short complete tubular accessory respiratory structure located close to the aperture and projecting forward to the aperture. In comparison, S. massiei has a long complete tubular accessory respiratory structure located further away from the aperture and projecting up to the apex. Spiraculum vilvensi has a long complete tubular accessory respiratory structure laying in the suture and projecting backwards to the aperture, and an apertural lip expanded near the suture (see Thach (2017) for comparison). Pterocyclos huberi has an expanded lip forming a canal-like accessory respiratory structure and projecting forward to the aperture. Spiraculum franzhuberi and S. thachi have both an expanded lip forming a canal-like accessory respiratory structure and a short tubular accessory respiratory structure located away from the aperture (see Thach (2017) for comparison).