Anauchen utaithaniensis Panha 2002

Anauchen utaithaniensis Panha, 2002 Figs 10 Q, 35, 36, 37 Anauchen utaithaniensis Panha in Burch & Panha, 2002: 244–245, fig. 3. Anauchen utaithaniensis — Tongkerd et al. 2004: 143, fig. 2; Panha and Burch 2008: 53–54, fig. 49; Dumrongrojwattana and Wongkamhaeng 2024: 323, fig. 7. Type material examined. Thailand • holotype; 1997; S. Panha leg.; CUMZ ver. 041 • 2 paratypes; same data as for the holotype; SMF 331454. Type locality. “ Patavi Mountain, Utaithani Province, 15°28'20"N, 99°45'17"E, 70 meters elevation … ” (Thailand). Diagnosis. This species is most similar to A. huaykhakang and A. banmiensis but they are both spirally striated. Anauchen angthongensis is also spirally striated, has it last whorl regularly rounded and has a narrower umbilicus. Distribution. This species is known only from the type locality. Remarks. This species shows intra-populational variation of the angulo-parietal lamella. The angulo-parietal lamella of the holotype is bifid, while that of the paratype is almost completely fused.