Aegistohadra mirifica (Bavay and Dautzenberg, 1909)

    Forest in mountains, Malipo, Yunnan Province, Peoples Republic of China, 2017. Sinistral shell on L: Dmax 26.2 mm, H 30.8 mm; dextral: Dmax 25.6 mm, H 30.9 mm. First collected by Colonel Louis Gabriel Martin Messager (see Breure and Páll-Gergely, 2019) between Lac-Kha and Xiu-Mau, Tonkin (Vietnam). Lee Collection. Digital image by Yang Hao.

Original description: Bavay and Dautzenberg (1909a: 235-236), and iconotype: Bavay and Dautzenberg (1909b: pl. 6, figs. 1-4 <https://www.biodiversitylibrary.org/page/27393444>) indicate that the shell is (exclusively) sinistral and wider than high. The lectotype [MNHN 20000-2047] <https://science.mnhn.fr/institution/mnhn/collection/im/item/2000-2047> appears identical to the iconotype and might be the de facto holotype. Placed in Aegistohadra Wu, 2004 by Jirapartrasilp et al. (2022).

Bavay, A. and P. Dautzenberg, 1909a. Molluscorum terrestrium Tonkinorum diagnoses.  Journal de  Conchyliologie 56: 229-251 <http://biodiversitylibrary.org/page/16298225>

Bavay, A. and P. Dautzenberg, 1909b. Description de coquilles nouvelles de l'Indo-Chine (5e suite). Journal de Conchyliologie 57: 163-206, plates 4-8 <http://biodiversitylibrary.org/page/27393440>.

Breure, A.S.H. & B. Páll-Gergely, 2019. More than just a name: Colonel Messager and his correspondents. Zoosystema 41(2): 7-19. Link

Jirapatrasilp, P., C.-W. Huang, C.-C Hwang, C. Sutcharit, and C.-T. Lee, 2022. Convergent evolution of Amphidromus-like colourful arboreal snails and phylogenetic relationship of East Asian camaenids, with description of a new Aegistohadra species (Helicoidei: Camaenidae: Bradybaeninae). Invertebrate Systematics 36(3): 244-290. 8 April.

See also: Lee, H.G., 2022. Aenigmatic Aegistohadra Part 2 (conclusion) -or- an account of a pretty astounding clade of sinistral and enantiomorphic land snail taxa. Shell-O-Gram 63(4): 3-10. July. (Link)