Anceyoconcha S. Tumpeesuwan & C. Tumpeesuwan, 2020

Nahok, Benchawan, Tumpeesuwan, Sakboworn & Tumpeesuwan, Chanidaporn, 2020, Anceyoconcha, a replacement name for the preoccupied tree snail genus Giardia Ancey, 1907 (Pulmonata: Helicoidea: Camaenidae), Raffles Bulletin of Zoology 68, pp. 80-90 : 81

Anceyoconcha S. Tumpeesuwan & C. Tumpeesuwan , new name

Giardia Ancey, 1907: 195 (Animalia: Mollusca: Pulmonata : Camaenidae ) (preoccupied by Künstler, 1882: 349 [Protista: Metamonada: Diplomonadida : Hexamitidae ]).

Type species. Bulimus siamensis Redfield, 1853 , by original designation of the replaced homonym Giardia Ancey, 1907 (Article 67.8; ICZN, 1999).

microscope at the Centre for Scientific and Technological Equipment, Suranaree University of Technology. The examined specimens are deposited in the land snail collection of the Natural History Museum, Mahasarakham University (NHMSU), and Zoological Research Collection of Burapha University, Chonburi, Thailand (ZRCBUU). The proposed new genus name Anceyoconcha is attributed to second and third authors, thus the complete authorship citation of this taxon name should be Anceyoconcha S. Tumpeesuwan & C. Tumpeesuwan in Nahok, S. Tumpeesuwan & C. Tumpeesuwan.

Remarks. Ancey (1907) proposed Giardia and designated Bulimus siamensis Redfield, 1853 , as the type species. Ancey (1907) also included Bulimus rhombostomus Pfeiffer, 1861 , in this new genus. This genus is currently in use for common tree snails in family Camaenidae (e.g., Schileyko, 2003, 2011; Raheem et al., 2017; Sutcharit et al., 2017; 2019). Earlier authors have likely overlooked the homonymy of the molluscan Giardia Ancey, 1907 , with the protozoan genus Giardia Künstler, 1882 , both of which are under the jurisdiction of the ICZN. The new replacement name Anceyoconcha for Giardia Ancey, 1907 , is mandatory according to Article 60 ( ICZN, 1999).

Diagnosis. Shell sinistral, elongated-ovate to conic, thin and rather transparent, with 6–9 slightly convex whorls. Last whorl rounded or slightly angulated. In living snails obviously branching vessel of mantle cavity present, approximately in the two last whorls, whereas the dark brown on pale black marble pattern is mostly present in the early whorls. Protoconch smooth. Post apical sculpture very weak and delicate radial wrinkles. Aperture irregularly ovate, slightly oblique, with shortly reflexed, thin margins. Columellar margin straight, well expanded. Umbilicus narrowly open. Dart sac and mucous glands absent. There is no distinct external boundary between epiphallus and penis. Flagellum moderately long and tapering. Vas deferens long, thin, entering epiphallus laterally. Free oviduct short. Vagina long, stout. Spermathecal stalk long, thin; proximal part wider than distal part; sac spear- or droplet- shaped, attending albumen gland.

Etymology. “Ancey” is in honour of the French conchologist César Marie Félix Ancey, and “concha” from the Latin word for shell or snail.