Microcystina Penang sp. 2

Goh, Soo-Mun, Jasrul, Dulipat, Lee, Mei-Yi, Vermeulen, Jaap J. & Liew, Thor-Seng, 2025, From 153 - year-old records to contemporary discoveries: land snail (Mollusca, Gastropoda) diversity in Penang Hill, Malaysia, ZooKeys 1230, pp. 99-154 : 99-154

Microcystina Penang sp. 2

Fig. 9 A

Material examined.

Malaysia • Penang Hill, The Habitat, Research trail, Plot. 01 ; 5.4248 ° N, 100.2669 ° E; 720 m a. s. l.; 5 Sept. 2022; T. S. Liew, J. Dulipat, S. M. Goh leg.; BOR/MOL 15456 • Penang Hill, The Habitat, Habitat nature trail, Plot. 07 ; 5.4210 ° N, 100.2642 ° E; 760 m a. s. l.; 6 Sept. 2022; T. S. Liew, J. Dulipat, S. M. Goh, M. Y. Lee leg.; BOR/MOL 15458 • Penang Hill, Air Itam, Forest near Dam, Plot. 25 ; 5.3900 ° N, 100.2575 ° E; 290 m a. s. l.; 25 Oct. 2022; T. S. Liew, J. Dulipat leg.; BOR/MOL 15459 • Penang Hill, Trail - Moniot Road East, Plot. 28 ; 5.4240 ° N, 100.2746 ° E; 530 m a. s. l.; 26 Oct. 2022; T. S. Liew, J. Dulipat leg.; BOR/MOL 15457 • Penang Hill, By Path H, Plot. 33 ; 5.4210 ° N, 100.2701 ° E; 610 m a. s. l.; 4 Feb. 2023; T. S. Liew, A. Yusni leg.; BOR/MOL 15763 .

Remarks.

This is a new record for Penang Hill. The shell spire is highly raised, with a height more than half of the last whorl height. This species has the most convex shell compared to other Microcystina species from Penang Hill. On the upper shell, the apical whorls have elevated spiral ribs that continue onto subsequent whorls, which are crossed by radial ribs forming granule-like sculptures. Below the shell, there are spaced grooves with spiral lines at the periphery, which reduce towards the umbilicus.

Figures

Figure 9. A Microcystina Penang sp. 2 BOR / MOL 15458 B Microcystina Penang sp. 4 BOR / MOL 15755 C Microcystina Penang sp. 5 BOR / MOL 15762 D Microcystina Penang sp. 6 BOR / MOL 15756. Scale bar: 0.5 mm.