Opisthoporus euryomphalus (L. Pfeiffer, 1856) Figures 7D, 46B

Cyclostoma (Opisthoporus) euryomphalum Pfeiffer, 1856: 337.

Type locality.

“Borneo” .

Material examined.

Gunung Doya: ME 1295, ME 8905, ME 9113, ME 9157. Gunung Kapor: ME 1294, ME 1298, ME 1299, ME 8071, ME 8496, ME 8779. Gunung Batu: ME 1300, ME 1301, ME 2613, ME 8807.

Distribution in Borneo.

Sarawak: Kuching Division. Kalimantan: West Kalimantan Province. Endemic to Borneo.

Remarks.

Living snails were observed foraging among leaf litter and plant debris near the cliff in a lowland limestone forest. It differs from O. biciliatus by having a smaller shell without the hairy periostracum.