|Notice:||This page is derived from the original publication listed below, whose author(s) should always be credited. Further contributors may edit and improve the content of this page and, consequently, need to be credited as well (see
). Any assessment of factual correctness requires a careful review of the original article as well as of subsequent contributions.
If you are uncertain whether your planned contribution is correct or not, we suggest that you use the associated discussion page instead of editing the page directly.
This page should be cited as follows (rationale):
Citation formats to copy and paste
TY - JOUR
See also the citation download page at the journal.
- Opisthostoma siphonostomum van Benthem Jutting, 1952: 52, figure 27 (original description).
- Opisthostoma siphonostomum van Benthem Jutting, van Benthem Jutting (1961: 39).
- Opisthostoma siphonostomum van Benthem Jutting, Berry (1964: 203).
Holotype: ZMA 136054(1) (Seen). Paratype: ZMA 136055(8) (Seen).
Other examined materials
ZMA 162138(>100), BOR 5513 (>25), BOR 5521(>10), BOR 5557(>10), V 8199(>50), V 8223(>25).
Shares with Plectostoma christae the tuba form, but differs by having an oblong conical apical and conical basal spire.
Apex. Shape: distinctly convex.
Spire. Height: 1.9–2.1 mm. Width: 1.2–1.5 mm. Number of whorls: 4 3/4–5. Apical spire shape: oblong conical. Basal spire shape: conical. Whorl periphery: distinctly convex. Umbilicus: Open.
Constriction. Parietal teeth: two. Basal teeth: none.
Tuba. Coiling direction: type 1 and aperture visible between right lateral and back view. Tuba whorl length in proportion to spire last whorl: ca. 3/8–1/2. Proportion of tuba that attaches to spire: at least 1/2.
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: 7–8 ribs per mm. Rib intensity: thin. Shape: slightly curved. Inclination: orthoclin.
Type locality. Gua Siput, Taman Negara, Pahang (4°26'47"N, 102°14'44"E).
Distribution range. Plectostoma siphonostomum has a similar distribution pattern as Plectostoma salpidomon and often occurs sympatrically with that species. It can be found in many limestone outcrops in the valley between the Titingwangsa Range, Tahan Range and Benom Range (Figure 18D).
Least concern. Living populations of Plectostoma siphonostomum were recorded at several limestone hills during surveys between 2010 and 2011. Several of these are located within the National Park.
See discussion under Plectostoma christae.
- 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
- Berry A (1964) The reproduction of the minute cyclophorid snail Opisthostoma (Plectostoma) retrovertens from a Malayan limestone hill. Proceedings of the Zoological Society of London 142: 655–664. doi: 10.1111/j.1469-7998.1964.tb04633.x