Plectostoma umbilicatum (van Benthem Jutting, 1952)
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Holotype: ZMA 136070(1) (Seen). Paratypes: ZMA 136071(8) (Seen).
See discussion under Plectostoma christae.
Type locality. Limestone hill cluster named Kota Tongkat (3°53'28"N, 102°28'23"E).
Distribution range. It is only known from the type locality. All other adjacent limestone outcrops have been sampled, but only other Plectostoma species were found (Figure 18D).