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- Opisthostoma crassipupa van Benthem Jutting, 1952: 51, figure 26 (original description).
- Opisthostoma crassipupa van Benthem Jutting, van Benthem Jutting (1961: 39).
- Opisthostoma crassipupa van Benthem Jutting, Clements (2007: 74).
- Opisthostoma crassipupa van Benthem Jutting, Clements et al. (2008: 2760).
Holotype: ZMA 135994(1) (Seen). Paratype: ZMA 135993(>50) (Seen).
Other examined materials
BOR 5512(>50), BOR 5515(2), BOR 5624(>10), BOR 5629(3), V 8392(>10), V 8407(10), V 8408(4), V 8437(>10), V 8898(7). V 8912(1), V 8956(1), V 9097(9), V 9157(>10), V 9326(>10), V 9353(3), V 9366(10).
Genetic distance between BOR 5512 and BOR 5515 is 14%.
Apex. Shape: slightly or moderately convex.
Spire. Height: 1.3–3.0 mm. Width: 1.2–1.4 mm. Number of whorls: 3 1/2–4 1/2. Apical spire shape: depressed conical. Basal spire shape: ovoid. Whorl periphery: moderately or distinctly convex. Umbilicus: closed by tuba (common) or partially open (rare).
Constriction. Parietal teeth: none. Basal teeth: none.
Tuba. Coiling direction: type 3 and aperture visible from left lateral view. Tuba whorl length in proportion to spire last whorl: ca. 1/2–3/4 Proportion of tuba that attaches to spire: whole.
Aperture and peristome. Peristome: double peristomes. Outer peristome shape: same as inner peristome and uniformly projected all around, except the posterior part.
Spiral lines. Thick lines: present. Thin lines: present.
Radial ribs. Rib density: 6–8 ribs per mm. Rib intensity: thin. Shape: straight. Inclination: moderately prosoclin.
Type locality. Gua Musang (4°52'59"N, 101°58'12"E).
Distribution range. This species mainly occurs in the limestome hills that are located between Gua Musang and as far as 30 km radius of Gua Musang. One populations exists at a limestone hill that is located about 90 km north of Gua Musang (Figure 18A).
Least Concern. Almost all the limestone hills are located along main roads and/or surrounded by oil palm plantation or cleared for urban development. However, several large limestone hills that hold the species are located in the well-protected National Park (Taman Negara), State of Pahang, Malaysia.
The species is well-characterised, although it displays considerable variability in the shell shape (Appendix 6).
- Liew, T; Vermeulen, J; Marzuki, M; Schilthuizen, M; 2014: A cybertaxonomic revision of the micro-landsnail genus Plectostoma Adam (Mollusca, Caenogastropoda, Diplommatinidae), from Peninsular Malaysia, Sumatra and Indochina ZooKeys, 393: 1-107. doi
- van Benthem Jutting W (1961) Additional new species and new localities of the family Vertiginidae and the genera Oophana and Opisthostoma from Malaya. The Bulletin of the National Museum 26: 34–48. http://rmbr.nus.edu.sg/rbz/biblio/26/26brm034-048.pdf
- Clements G (2007) Conservation biogeography of terrestrial molluscs on tropical limestone karsts. MSC thesis. National University of Singapore.