A–D Intraspecific variation in shell shape and sculpture of Georissa hosei Godwin-Austen, 1889 E–G Intraspecific variation in shell shape and sculpture of Georissa bauensis sp. n. H Georissa pyrrhoderma Thompson & Dance, 1983 I Georissa sepulutensis sp. n. For comparison with the “scaly group”, two additional species are shown that do not belong to the “scaly group”, namely: J Georissa gomantongensis Smith, 1893 and K Georissa nephrostoma Vermeulen et al., 2015. Localities: A, B Gunung Liak/Padang (Jambusan, Sarawak) C Bukit Siboyuh (Jambusan, Sarawak) D Bukit Tongak (Bau/Jambusan, Sarawak) E, F Gunung Podam (Bau, Sarawak) G Wind Cave Nature Reserve (Bau, Sarawak) H Gunung Silabur (Serian, Sarawak) I Batu Sanaron (Sanaron, Sabah) J Gua Gomantong (Gomantong, Sabah) K Keruak (Kinabatangan, Sabah). Scale bar 500 µm.

 
 
  Part of: Khalik MZ, Hendriks K, Vermeulen JJ, Schilthuizen M (2018) A molecular and conchological dissection of the “scaly” Georissa of Malaysian Borneo (Gastropoda, Neritimorpha, Hydrocenidae). ZooKeys 773: 1-55. https://doi.org/10.3897/zookeys.773.24878