Phaedusa Adams & Adams, 1855

Man, Nem Sian, Lwin, Ngwe, Sutcharit, Chirasak & Panha, Somsak, 2023, Further notes on the taxonomy of the land snail family Clausiliidae Gray, 1855 (Stylommatophora, Helicina) from Myanmar with description of two new species, ZooKeys 1160, pp. 1-59 : 1

Genus Phaedusa Adams & Adams, 1855

Clausilia (Phaedusa) Adams & Adams, 1855: 184. Boettger 1877: 54. Pfeiffer and Clessin 1881: 390. Gude 1914: 305.

Phaedusa -Thiele, 1931: 530. Zilch 1959: 389. Schileyko 2000: 599. Nordsieck 2002b: 88. Nordsieck 2007: 30.

Type species.

Clausilia corticina Pfeiffer, 1842, by subsequent designation of Martens in Albers (1860: 275).

Diagnosis.

Shell fusiform, more or less turreted, spire attenuated and shell surface with fine wavy to oblique striations. Palatal plicae short mostly, middle plicae weak to developed and 3 to 7 in number. Superior lamella low, connected to or separated from spiralis, and distinct at transition to spiralis. Inferior lamella spirally ascending and ending close to superior lamella from aperture view. Subcolumellaris visible or invisible in frontal view. Clausilium plate lateral side, rounded and broad.

External features.

Animal covered with reticulated, dark gray skin; tentacles short; body and tail with paler color on lateral margin of foot; foot moderately elongated, posteriorly obtusely pointed.

Remarks.

Nordsieck (2002b) compiled all the Southeast Asian Phaedusinae and summarized their diagnostic characteristics. Although Phaedusa and Loosjesia Nordsieck, 2002 are recognized as having spirally ascending inferior lamella, Phaedusa possesses shorter or weaker palatal plicae with the inferior lamella more narrowly spiral; in contrast, Loosjesia possesses longer and more developed palatal plicae, and much more spiral inferior lamella. Phaedusa closely resembles the Indian Cylindrophaedusa Boettger, 1877 ( Gittenberger et al. 2019).

In the most recent generic classifications and species accounts by Grego et al. (2021) and Szekeres et al. (2021a, b), the genus Phaedusa from Myanmar is comprised of eight species, of which only three species were collected and re-described herein.