Opisthostoma javanica Benthem-Jutting, 1932

Lee, Jie Ying, Nasir, Nurul Syafiqah, Marzuki, Mohammad Effendi, Vermeulen, Jaap J. & Khalik, Mohd Zacaery, 2024, The land snail fauna of Batu Kudik, isolated limestone outcrop near Simunjan, Sarawak, Malaysian Borneo (Mollusca, Gastropoda), Biodiversity Data Journal 12, pp. 115556-115556 : 115556

Opisthostoma javanica Benthem-Jutting, 1932

Materials

Type status: Other material. Occurrence: catalogNumber: MZU.MOL.22.192 ; individualCount: 1138; occurrenceID: DA3F927F-4ACA-5977-AAFD-7ACE5900A225; Taxon : family: Diplommatinidae ; genus: Opisthostoma ; scientificNameAuthorship: Benthem-Jutting , 1932; Location : locality: Batu Kudik , Simunjan, Sarawak Type status: Other material. Occurrence: catalogNumber: ME 13359 ; individualCount: 974; occurrenceID: 9D969EE8-F9F9-53E4-B938-59538C239EC9; Taxon : family: Diplommatinidae ; genus: Opisthostoma ; scientificNameAuthorship: Benthem-Jutting , 1932; Location : locality: Batu Kudik , Simunjan, Sarawak Type status: Other material. Occurrence: catalogNumber: ME13894 ; individualCount: 1410; occurrenceID: 9F31BD45-A97D-53F8-B5F4-F3818B50CAB7; Taxon : family: Diplommatinidae ; genus: Opisthostoma ; scientificNameAuthorship: Benthem-Jutting , 1932; Location : locality: Batu Kudik, Simunjan, Sarawak

Distribution

Sarawak: Samarahan Division. Distribution elsewhere: Indonesia: Kalimantan, Java, Madura and Celebes ( Vermeulen 1991).

Notes

Living snails were observed amongst the leaf litter and plant debris inside the collapsed cave. Bornean Opisthostoma javanica Benthem-Jutting, 1932 has constriction with transverse palatalis together with infracolumellaris. Nurinsiyah and Hausdorf (2017) mentioned that the infracolumellaris was not observed in the Javan population. However, the shell radial ribs are widely spaced (4-6 ribs/0.5 mm on the penultimate whorl) and with distinctly elevated top whorls compared to Javan Opisthostoma javanica . Some specimens characterised by the rather upward-turned aperture similar to some Opisthostoma occurring in Peninsular Malaysia. The representative is shown in Fig. 12 . The identification of the species was based on the original description of the species by van Benthem-Jutting (1932) and species description by Vermeulen (1991). Syntype, not seen (ZMA 136008).

Figures

Figure 12. Apertural, posterial, umbilical and apical views of Opisthostoma javanica (MZU. MOL. 22.192). Scale = 1 mm.