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 Ptychopatula orcula (Benson, 1850) Figure 31B Materials examined. Prk 53 Hill KF : BOR/ MOL 10708 , BOR/ MOL 10723 . mykarst-184 Bat Cave : BOR/MOL 9862, BOR/MOL 9782, BOR/MOL 9815, BOR/MOL 9842. Prk 47 Kanthan : BOR/MOL 9078, BOR/MOL 9171. mykarst-027: BOR/MOL 9043, BOR/MOL 9118. mykarst-025: BOR/MOL 9391, BOR/MOL 9426, BOR/MOL 9488, BOR/MOL 9522. Prk 42 G. Bercham : BOR/MOL 9457, BOR/MOL 9463, BOR/MOL 9478, BOR/MOL 9219, BOR/ MOL 10584 , BOR/ MOL 10599 , BOR/ MOL 10621 , BOR/ MOL 10631 , BOR/ MOL 10632 . Prk 23 G. Rapat : BOR/ MOL 10218 , BOR/ MOL 10036 , BOR/ MOL 10235 , BOR/ MOL 10269 . mykarst-185 Batu Kebelah : BOR/MOL 9537, BOR/MOL 9743. Prk 64 Bt Kepala Gajah : BOR/ MOL 10104 , BOR/ MOL 10148 , BOR/ MOL 10185 . Prk 36 Gua Datok : BOR/ MOL 10429 , BOR/ MOL 10471 , BOR/ MOL 10503 . Prk 01 G. Tempurung : BOR/ MOL 11144 , BOR/ MOL 11224 , BOR/ MOL 11426 . Prk 34 G. Tasek : BOR/ MOL 11163 , BOR/ MOL 11008 , BOR/ MOL 11042 , BOR/ MOL 11182 . Prk 55 G. Pondok : BOR/ MOL 11487 , BOR/ MOL 11526 , BOR/ MOL 11551 . Distribution. In Peninsular Malaysia, known from Perlis and Perak ( Maassen 2001 ). Elsewhere, in the tropical regions of the Indian Ocean and the Pacific Islands ( Seddon 2000 ). Remarks. Distinguished from sympatric congener Ptychopatula solemi by its larger shell, wider whorls, wide umbilicus and lower spire.