Videna bicolor (Martens, 1864)

Marzuki, Mohammad Effendi bin, Liew, Thor-Seng & Mohd-Azlan, Jayasilan, 2021, Land snails and slugs of Bau limestone hills, Sarawak (Malaysia, Borneo), with the descriptions of 13 new species, ZooKeys 1035, pp. 1-113 : 1

Videna bicolor (Martens, 1864) Figures 43C , 52B

Trochomorpha bicolor Martens, 1864: 267.

Type locality.

"Im mittleren Sumatra" [= Central Sumatra].

Material examined.

Bukit Sekunyit: ME 1202. Gunung Doya: ME 3356, ME 8910, ME 9032, ME 9116. Gunung Kapor: ME 1199, ME 1205, ME 3361, ME 8775, ME 9225, ME 9844. Kampung Bunga Rampai: ME 1198. Lobang Angin: ME 8732, ME 9271. Gunung Batu: ME 1106, ME 1203, ME 1209, ME 8825.

Distribution in Borneo.

Sarawak: Kuching, Serian, Sibu, Mukah, Kapit, and Miri divisions. Sabah: Interior and West Coast divisions. Kalimantan: West and South Kalimantan provinces. Distribution elsewhere. Sumatra to Lesser Sunda ( Vermeulen and Whitten 1998).

Remarks.

Living snails were observed foraging on wet rotten wood surfaces and crown of a plant of the limestone cliff. It differs from V. timorensis (Martens, 1867) by having a medium-sized dark brown shell with wide umbilicus and a smooth shell surface. This is the most common Videna species in Sarawak.

Figures

Figure 43. A Geotrochus conicoides (Metcalfe, 1851) ME 8911 Gunung Doya B Geotrochus subscalaris Vermeulen, Liew & Schilthuizen, 2015 ME 1636 Gunung Kapor C Videna bicolor (Martens, 1864) ME 8732 Lobang Angin D Videna timorensis (Martens, 1867) ME 8972 Gunung Kapor E Exrhysota brookei (A. Adams & Reeve, 1848) ME 8790 Gunung Kapor.

Figure 52. Living snails from Bau A Videna timorensis (Martens, 1867) ME 8984 Lobang Angin B Videna bicolor (Martens, 1864) ME 8732 Lobang Angin C Kaliella barrakporensis (L. Pfeiffer, 1852) ME 9026 Gunung Kapor D Microcystis dyakana Godwin-Austen, 1891 ME 8969 Gunung Kapor. All not to scale.