A snail reported from Bacan Island and southern Halmahera.
The description of 7 shells from the 2022 expedition gives shell height 17.1–20.5 mm; sex and adult stage are not reported.
In the May 2022 Bacan Island survey, Papuina pileolus was collected at two sites. Three specimens came from a non-karst banana plantation in Marabose Village at 128 m on 29 May; four came from karst forest in Babang Village at 46 m on 31 May. Table 1 lists seven individuals, 1.3% of the survey total.
The shell description gives heights of 17.1–20.5 mm (mean 18.6), widths of 22.0–25.9 mm (mean 23.9), and 5–5.5 whorls. The high-conical shell is yellowish brown with irregular white markings, a closed umbilicus, and an oblique aperture. The paper also lists records from southern Halmahera and near Telaga Manga Joang, as well as Bacan.
An extinction-risk assessment has not been added yet.