Anauchen messageri

Anauchen messageri (Bavay & Dautzenberg, 1904) Boysidia messageri Bavay & Dautzenberg, 1904: 211, pl. 9, figs 1–4. Anauchen messageri — Pilsbry 1917: 189, pl. 33, figs 4–7; Schileyko 2011: 5; Páll-Gergely 2023 a: 67, fig. 1 C. Anauchen massageri [sic!] — Burch and Panha 2002: 242, 245, 247. Anauchen whitteni Chen, 2023: 90–91, figs 1, 2. syn. nov. Type material examined. Vietnam • 1 syntype of A. messageri; from the type locality; C. Messager leg.; MNHN -IM-2000-35159. Additional material examined. Vietnam • 2 shells; Cao Bang Province, Đeo Ma Phuc - Quang Uyen, left side of the road, rock crevice; 22°43.981'N, 106°20.333'E; 610 m a. s. l.; 14 Nov. 2011; A. Hunyadi leg.; coll. HA • 1 shell; Cao Bang Province, west of Quang Uyen, Phi Hao-Đau Tuyen; 22°42.188'N, 106°26.358'E; 500 m a. s. l.; 16. Nov 2011.; A. Hunyadi leg.; coll. HA • 8 shells; Lang Son Province, Huu Lung district, Minh Tien, 1400 m northeast of Cau Cheo Minh Tien; 21°34.024'N, 106°17.790'E; 30 m a. s. l.; 20 Feb. 2020; A. Hunyadi leg.; coll. HA • 13 shells; Lang Son Province, Huu Lung district, Huu Lien, 33.5 km from junction of roads 1 B and 241 towards Ba Nang, left side of the road; 21°41.064'N, 106°22.871'E; 220 m a. s. l.; 19 Feb. 2020; A. Hunyadi leg; coll. HA • 47 shells; Hoa Binh Province, Kim Boi district, Cao Duong, north of Đong Phu, 58 km from Nho Quan towards Hanoi on the Ho Chi Minh road; 20°42.591'N, 105°39.299'E; 10 m a. s. l.; 16 Feb. 2020; A. Hunyadi, H. V. Luong, J. U. Otani & S. V. Pham leg.; coll. HA • 1 shell; Thanh Hoa Province, Xa Ban Cong, Xom Sat; 20°22.897'N, 105°12.712'E; 60 m a. s. l.; 18. May 2012 ¸ A. Hunyadi leg.; coll. HA • 15 shells; Thanh Hoa Province, 9.8 km from centre of Ngoc Lac towards Lang Chanh, Ngoc Khe, left side of the road, 115 km; 20°7.192'N, 105°18.277'E; 13 Feb. 2020; A. Hunyadi, H. V. Luong, J. U. Otani & S. V. Pham leg.; coll. HA. China • 9 shells; Guangxi, Bose Shi, Leye Xian, Buliu He; 24°39.436'N, 106°43.245'E; 540 m a. s. l.; 08 Sept. 2013; A. Hunyadi leg.; coll. HA • 74 shells; Guangxi, Hechi Shi, Huanjiang Maonanzu Zizhixian, south of Mulun Guojiaji Ziran Baohuqu, Dongning; 25°05.970'N, 107°57.639'E; 530 m a. s. l.; 17 Sept. 2013, A. Hunyadi leg.; coll. HA • 3 shells; Guangxi, Laibin Shi, Xingbin Qu, Qidong Xiang; 24°00.512'N, 109°04.288'E; 150 m a. s. l.; 20 Sept. 2013; A. Hunyadi leg. • 2 shells; coll. HA • 2 shells; Guangxi, Hechi Shi, Du an Yaozu Zizhixian, Gaoling Xiang, 2 km west of Dingfucun; 24°03.197'N, 108°01.290'E; 320 m a. s. l.; 08 Oct. 2009; A. Hunyadi leg.; coll. HA • 171 shells; Guangxi, Hechi Shi, Bama Yaozu Zizhixian, southern edge of Jiaolecun; 24°07.045'N, 107°07.847'E; 590 m a. s. l.; 10 Sept. 2013; A. Hunyadi leg.; coll. HA • 24 shells; Guangxi, Hechi Shi, Nandan Xian, Lihuyaozu Xiang, southeast of Encun, rocks above the road; 25°04.163'N, 107°36.176'E; 630 m a. s. l.; 11 Sept. 2013; A. Hunyadi leg.; coll. HA • 10 shells; Guangxi, Guilin Shi, Guilin, Ludiyan Gongyuan, northeastern side of Moupanshan; 25°18.466'N, 110°15.862'E 145 m a. s. l.; 22 Sept. 2013; A. Hunyadi leg.; coll. HA • 14 shells; Guangxi, Chongzuo Shi, Longzhou Xian, Wude Xiang, vicinity of the junction towards Banxintun; 22°35.239'N, 106°46.096'E; 350 m a. s. l.; 24 Sept. 2013; A. Hunyadi leg.; coll. HA • 257 shells; Guangxi, Hechi Shi, Tiane Xian, Qimu Xiang, junction towards Lahaiyan, rock above the tomb; 24°51.130'N, 107°11.670'E; 600 m a. s. l.; 12 Sept. 2013; A. Hunyadi & M. Szekeres leg.; coll. HA • 5 shells; Guangxi, Guilin Shi, Yangshuo Xian, 5 km north of Xingpingzhen; 24°57.358'N, 110°31.857'E; 150 m a. s. l.; 15 Oct. 2009; A. Hunyadi leg.; coll. HA • 13 shells; Yueliangshan, Gaotianzhen, Yangshuoxian, Guangxi Zhuangzu Zizhiqu; 24°43.45'N, 110°28.32'E; K. Ohara, K. Okubo, J. U. Otani leg.; coll. PGB • 17 shells; Daxiaojingfengjingqu, Moyangzhen, Luodianxian, Guizhousheng; 25°33.73'N, 106°51.4333'E; 450 m a. s. l.; T. Ishibe, K. Okubo, J. U. Otani leg.; coll. PGB • 4 shells; near Hudiequan bridge, Gaotianzhen, Yangshuoxian, Guangxi Zhuangzu Zizhiqu; 24°44.45'N, 110°29.62'E; K. Ohara, K. Okubo, J. U. Otani leg.; coll. PGB. Type localities. “ Haut-Tonkin ” (Vietnam) (A. messageri); “ Collected from the rocks, Mt. Nanshe [南蛇山], Yizhou District [宜州区], Hechi City [河池市], Guangxi Zhuang Autonomous Region, China. 24°30'22"N, 108°38'51"E, 270 m … ” (A. whitteni). Differential diagnosis. Anauchen jokaii sp. nov. lacks the spiral striation and has its last whorl keeled at the base which separates it from A. messageri. Anauchen kozari is smaller, more depressed and has a palatal tubercle. See also under A. pentadens, A. rochebruni and A. turritus sp. nov. Distribution. This species has a wide distribution across Vietnam and China. Its northernmost known localities are situated in northern parts of Guangxi province (China) while the southernmost are from Thanh Hoa province (Vietnam). Remarks. We have observed high morphological variability within this species, particularly in the slenderness of the shell (Fig. 25). The basal plica is also occasionally present or sometimes absent. Anauchen whitteni Z. - Y. Chen, 2023 was described as a distinct species based on the absence of the basal plica. Since the basal plica was found here as a variable character and the species does not differ from A. messageri in any other characters, it is treated here as a junior synonym.