Annotated checklist of the terrestrial molluscs from Laos (Mollusca, Gastropoda) Author Inkhavilay, Khamla Author Sutcharit, Chirasak Author Bantaowong, Ueangfa Author Chanabun, Ratmanee Author Siriwut, Warut Author Srisonchai, Ruttapon Author Pholyotha, Arthit Author Jirapatrasilp, Parin Author Panha, Somsak text ZooKeys 2019 834 1 166 http://dx.doi.org/10.3897/zookeys.834.28800 journal article http://dx.doi.org/10.3897/zookeys.834.28800 1313-2970-834-1 A9309D4615834D33A6B7F824BC3160FD A9309D4615834D33A6B7F824BC3160FD 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).