Microcystina undetermined-4

Microcystina Penang sp. 4 Fig. 9 B Material examined. Malaysia • Penang Hill, The Habitat, Research trail, Plot. 03; 5.4226 ° N, 100.2645 ° E; 750 m a. s. l.; 5 Sept. 2022; T. S. Liew, J. Dulipat, S. M. Goh leg.; BOR/MOL 15462 • Penang Hill, Botanical garden, Plot. 12; 5.4396 ° N, 100.2860 ° E; 85 m a. s. l.; 4 Sept. 2022; T. S. Liew, J. Dulipat, S. M. Goh leg.; BOR/MOL 15463 • Penang Hill, Moniot trail, Plot. 32; 5.4165 ° N, 100.2574 ° E; 695 m a. s. l.; 4 Feb. 2023; T. S. Liew, A. Yusni leg.; BOR/MOL 15755. Remarks. This is a new record for Penang Hill. The shell spire is moderately raised, with a height less than half of the last whorl height. On the upper shell, the apical whorls are smooth, and subsequent whorls have regularly spaced deep radial grooves. This species has the most prominent radial grooves compared to other Microcystina species from Penang Hill. Below the shell, there are regularly spaced, deep, radial grooves that continue from the upper shell.