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Holotype: Not Seen. Paratype: ZMA 136014(1) (Seen).
The morphology of this species is quite variable in shell size and degree of attachment of the tuba to the spire. The distribution range partially overlaps with that of Plectostoma davisoni. It is possible that the species actually consists of two or more cryptic species, and thus more genetic data are needed.
Type locality. “Kelantan, Malay Peninsula”, collected by J. Waterstradt (Sykes 1902). According to Waterstradt’s (1902) itinerary, he visited one of the limestone hills at Kampung Pulai. The Pulai Princess cave (4°47'38"N, 101°56'31"E) fits perfectly with Waterstradt’s descriptions on the local population, temples and hill’s topography; he also described that he and his collectors sampled shells here (Waterstradt 1902: 9–10). We conclude that Pulai Princess Cave must be the type locality of Plectostoma laidlawi. However, a recent survey at the highly degraded Bukit Pulai Princess cave failed to retrieve any shells of Plectostoma.
Distribution range. This species occurs on the limestone hills along Berok River and Nenggiri River (Figure 18B).