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| [A] Aegistohadra dautzenbergi, [F] Aegistohadra mirifica, [D–E] Aegistohadra roemeri and [G–H] Aegistohadra zhangdanae Jirapatrasilp & Lee, 2022 in Jirapatrasilp, Huang, Hwang, Sutcharit & Lee, 2022. DOI: 10.1071/IS21015 |
Abstract
East Asian terrestrial snails of the family Camaenidae are diverse in terms of genus and species numbers, shell morphology and mode of living. This family also includes colourful conical arboreal snails that traditionally have been assigned to the genus Amphidromus. Yet, the present study shows that, despite their deceiving conchological similarity, some of these East Asian arboreal snails do not belong to the genus Amphidromus in the subfamily Camaeninae. The presence of a dart complex comprising a mucous gland, a dart sac, an accessory sac and a proximal accessory sac, along with a pronounced penial caecum and molecular phylogenetic analyses revealed that former “Amphidromus” dautzenbergi, “A.” roemeri and “Camaena” mirifica, and one additional new species belong to Aegistohadra in the subfamily Bradybaeninae. Aegistohadra dautzenbergi, comb. nov. and Aegistohadra roemeri, comb. nov. are more conical with colourful spiral bands, whereas Aegistohadra mirifica, comb. nov. and Aegistohadra zhangdanae, sp. nov. are heliciform to conical with colourful, variegated spiral and transverse banding patterns. DNA sequence analyses also revealed that each variety of Ae. dautzenbergi could not be differentiated by mitochondrial (COI and 16S rRNA) gene fragments. The phylogenetic position of Aegistohadra within the East Asian camaenids revealed that the similar appearance in shell morphology, microhabitat use and diet to arboreal snails in the genus Amphidromus is homoplastic. Moreover, the presence/absence of a dart complex is also homoplastic and is unsuitable for suprageneric classification. In contrast, the presence of a flagellum and a penial caecum is more informative for the suprageneric classification.
Keywords: Aegistohadra, Amphidromus, Camaenidae, convergent evolution, East Asia, homoplasy, suprageneric classification, tree snail.
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| [A–C] Aegistohadra dautzenbergi, [D–E] Aegistohadra roemeri, [F] Aegistohadra mirifica, and [G–H] Aegistohadra zhangdanae, sp. nov. หอยต้นไม้ A–C 𝐴𝑒𝑔𝑖𝑠𝑡𝑜ℎ𝑎𝑑𝑟𝑎 𝑑𝑎𝑢𝑡𝑧𝑒𝑛𝑏𝑒𝑟𝑔𝑖 D–E 𝐴𝑒𝑔𝑖𝑠𝑡𝑜ℎ𝑎𝑑𝑟𝑎 𝑟𝑜𝑒𝑚𝑒𝑟𝑖 E แสดงไข่บนพื้นใบไม้ F 𝐴𝑒𝑔𝑖𝑠𝑡𝑜ℎ𝑎𝑑𝑟𝑎 𝑚𝑖𝑟𝑖𝑓𝑖𝑐𝑎 G–H หอยต้นไม้ชนิดใหม่ของโลก 𝐴𝑒𝑔𝑖𝑠𝑡𝑜ℎ𝑎𝑑𝑟𝑎 𝑧ℎ𝑎𝑛𝑔𝑑𝑎𝑛𝑎𝑒 Jirapatrasilp & Lee, 2022 H แสดงไข่บนพื้นใบไม้ |
Parin Jirapatrasilp, Chih-Wei Huang, Chung-Chi Hwang, Chirasak Sutcharit and Chi-Tse 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. DOI: 10.1071/IS21015
