Plectostoma annandalei (Sykes, 1903)
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Discussion.
This species has not been seen or collected after the original description. The type specimens cannot be located. Sykes (1903) mentioned that it is similar to Plectostoma laidlawi but he did not explain explicitly in what way. This is not unexpected, as Plectostoma laidlawi was the only onePlectostoma known from Peninsular Malaysia at the time, although more than 20 Plectostomaspecies had already been described from Borneo. Thus, one can assume that the statement made by Sykes was based on the geographical proximity.
Interestingly, Plectostoma panhai was described from a limestone hill located just 8 km from the location where Plectostoma annandalei was found. In addition to the geographical proximity, the two neighbouring species are similar in several shell characteristics. The shell spires are very similar in terms of number of whorls, overall shape and size. On the other hand, the main difference between these two species is the tuba coiling direction (type 1 vs. type 2).
This species only known from its type locality - Jalor (Biserat). The exact location was not described in the original publication of this species, but probably at the South of Thailand (Yala).
The limestone hills visited by Annandale, who was the collector of this species, were documented in Annandale N and Robinson HC (1903). From the map in Annandale N and Robinson HC (1903), the limestone hill is named Bukit Bayu and its GPS coordinate is 6.280107 N,101.226389 E, which derived from GoogleMap.
Annandale N and Robinson HC (1903) Itinerary in Perak, Selangor and the Siamese Malay States. Fasciculi Malayenses Suppl. Pp. i-xliv.