Operculate land snails (Gastropoda, Caenogastropoda, Cyclophoroidea) from Padang Bindu Karst, South Sumatra, Indonesia with the description of a new species, Chamalycaeus dayangmerindu

The study on Cyclophoroidea from Padang Bindu Karst, South Sumatra, was conducted to document the species diversity of the superfamily in the area. The samples, including leaf litter and soil samples, were collected in May-June 2021 and followed by the determination and examination on 2023 to 2024 in the Museum Zoologicum Bogoriense. In total 3,780 specimens from the superfamily Cyclophoroidea were examined. Measurements of the shell and operculum were performed using L.A.S V4. 13.0 and IMAGE J. The research revealed 11 species from three families (Cyclophoridae, Diplomatinidae, Pupinidae) and four subfamilies. <i>Plectostoma kitteli</i> is the most abundant species followed by <i>Stomacosmethis cf. jagori</i> (19.84%) and <i>Diplommatina liwaensis</i> (6.67%). A new species, <i>Chamalycaeus dayangmerindu</i> Aulia & Nurinsiyah, <b>sp. nov</b>. is described. The study also discovered four species endemics to Sumatra with one species among them so far only recorded from Padang Bindu karst area. These findings emphasize the region's unique biodiversity.