Plectostoma charasense (Tomlin, 1948)
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The taxonomic status of this species is stable. Although the two neighbouring species,Plectostoma tohchinyawi and Plectostoma praeco, are similar to Plectostoma charasense, there are a few key shell characters that separate Plectostoma charasense from the others. See discussion under Plectostoma tohchinyawi for more discussion about the biogeography of this species.
Type locality. Gua Charas, limestone hill near Sungai Lembing in the state of Pahang, Malaysia (3°54'27"N, 103°8'47"E).
Distribution range. Until now, this species has been recorded from two neighbouring limestone hills, namely, Gua Charas and Bukit Panching. However, the whole hill of Bukit Panching has been lost to quarrying (Figure 18B).