Diversity and biogeography of land snails (Mollusca, Gastropoda) in the limestone hills of Perak, Peninsular Malaysia Author Foon, Junn Kitt Institute for Tropical Biology and Conservation, Universiti Malaysia Sabah, Jalan UMS, 88400 Kota Kinabalu, Sabah, Malaysia & Rimba, 22 - 3 A, Casa Kiara 2, Jalan Kiara 5, 50480 Kuala Lumpur, Malaysia Author Clements, Gopalasamy Reuben Rimba, 22 - 3 A, Casa Kiara 2, Jalan Kiara 5, 50480 Kuala Lumpur, Malaysia & Department of Biological Sciences, Sunway University, No. 5 Jalan Universiti, 47500 Bandar Sunway, Selangor, Malaysia Author Liew, Thor-Seng Institute for Tropical Biology and Conservation, Universiti Malaysia Sabah, Jalan UMS, 88400 Kota Kinabalu, Sabah, Malaysia & Rimba, 22 - 3 A, Casa Kiara 2, Jalan Kiara 5, 50480 Kuala Lumpur, Malaysia thorsengliew@gmail.com text ZooKeys 2017 2017-07-04 682 1 94 http://dx.doi.org/10.3897/zookeys.682.12999 journal article http://dx.doi.org/10.3897/zookeys.682.12999 1313-2970-682-1 0AE82225C67E4D908BBEC30124E6C312 FFBCE458FFDBFFC93B2EFFB2F562FFBE 3484859 Opisthoporus rostellatus (Pfeiffer, 1851) Figure 8B Materials examined. mykarst-184 Bat Cave : BOR/MOL 9834. Prk 36 Gua Datok : BOR/ MOL 10416 , BOR/ MOL 10444 , BOR/ MOL 10475 , BOR/ MOL 10488 . Prk 42 G. Bercham : BOR/ MOL 10595 . Prk 01 G. Tempurung : BOR/ MOL 11132 , BOR/ MOL 11212 , BOR/ MOL 11410 . Distribution. In Peninsular Malaysia, known from Perak ( Maassen 2001 ). Elsewhere, in Singapore ( Maassen 2001 ). Remarks. Distinguished from Opisthoporus penangensis (Stoliczka, 1872) by the pneumatophore being longer and further from the aperture and the presence of a wing-like sutural extension at the peristome.