A Geosesarma danumense, ovigerous female (14.9 × 15.1 mm) (ZRC 2017.1273) B, C G. danumense, male (carapace width ca. 1.5–2.0 cm), on log approx. 30 cm from ground, ca. 30 m from river flowing through Danum Valley Field Centre, 10 pm, 25 July 2013, specimen not collected (photographs: Marcus Ng) D G. sabanum, male, on leaf above ground, Tawau Hills National Park, specimen not collected (photograph Ying Seawei).

  Part of: Ng PKL, Ng PYC (2018) The freshwater crabs of Danum Valley Conservation Area in Sabah, East Malaysia, with a description of a new species of Thelphusula Bott, 1969 (Crustacea, Brachyura, Gecarcinucidae, Potamidae, Sesarmidae). ZooKeys 760: 89-112. https://doi.org/10.3897/zookeys.760.24787