Anauchen pentadens

Anauchen pentadens (D. - N. Chen, M. Wu & G. - Q. Zhang, 1999) Fig. 37 Boysidia (Boysidia) pentadens Chen, Wu & Zhang, 1999: 5 (Chinese description), 11 (English description), fig. 2. — Chen and Zhang 2002: 692. Boysidia pentadens — Qian and Zhou 2014: 90–91; Chen et al. 2016: 50; Dumrongrojwattana and Assawawattagee 2018: 216. Anauchen pentadens — Chen 2023: 89–90. Material examined. None. Type locality. “ collected from Menglun Town (21°5'N, 100°6'E). Mengla County, Yunnan Province ” (China). Differential diagnosis. This species differs from A. messageri by its less triangular shell, narrower umbilicus, absence of spiral striation, and presence of strong radial ribs on the last whorl (especially near the aperture). Anauchen pentadens differs from A. jokaii sp. nov. by its wider umbilicus, strong ribs on the last whorl, especially near the aperture, and a basal plica. Its last whorl is also regularly rounded, so the is shell less triangular. See also under A. rochebruni. Distribution. This species is known only from Yunnan Province, China. Remarks. According to the figures presented in Qian and Zhou (2014) and Chen et al. (2016), Chen (2023) considered it a member of Anauchen rather than Boysidia which we follow herein.