Hypselostomatidae

The shell of a typical hypselostomatid ranges from conical or conical-ovoid to depressed-conical. However, the body whorl frequently becomes detached from the penultimate whorl (Hoekstra and Schilthuizen 2011; Chen et al. 2022). This separation—known as a solute or uncoiled condition—drastically alters the overall shell profile, often resulting in a trumpet-like or distorted appearance. ==Distribution==

Distributed mainly in Southeastern Asia,but also in India to Pakistan, China, Japan and Australia; mostly on limestone habitats. ==Taxonomy==

The Hypselostomatidae were originally established as a subfamily of Chondrinidae (Zilch 1959). In that same work, Zilch erected the subfamily Aulacospirinae, which was later synonymized by Schileyko (1998). Systematic placement has since remained a subject of debate: while Bouchet et al. (2017) treated the group as a subfamily of Gastrocoptidae, other authors have classified these representatives under Vertiginidae (Panha 1998; Tanmuangpak and Dumrongrojwattana 2022) or Pupillidae (Burch and Panha 2002). More recently, several authors have advocated for full family status as the Hypselostomatidae (Gojšina et al. 2022; Páll-Gergely 2023a, b). ==Genera==

• Acinolaemus Thompson & Upatham, 1997 • Anauchen Pilsbry, 1917 • Angustopila Jochum, Slapnik & Páll-Gergely, 2014 • Antroapiculus Panha & Burch, 1999: synonym of Antroapiculus Panha & J. B. Burch, 2002 accepted as Hypselostoma W. H. Benson, 1856 (incorrect subsequent spelling) • Aulacospira Möllendorff, 1890 • Bensonella Pilsbry & Vanatta, 1900 • Boysia L. Pfeiffer, 1849 • Boysidia Ancey, 1881 • Clostophis Benson, 1860 • Dentisphaera Páll-Gergely & Jochum, 2017 - endemic to the caves in Northern Vietnam • Gyliotrachela Tomlin, 1930: synonym of Hypselostoma W. H. Benson, 1856 (junior subjective synonym) • Hypselostoma Benson, 1856 - the type genus of the family • Krobylos Panha & Burch, 1999 • Montapiculus Panha & Burch, 1999: synonym of Clostophis W. H. Benson, 1860 (junior synonym) • Pseudostreptaxis Möllendorff, 1890 • Tonkinospira Jochum, Slapnik & Páll-Gergely, 2014 • Paraboysidia Pilsbry, 1917: synonym of Bensonella Pilsbry & Vanatta, 1900 (junior subjective synonym) ==References==