Notoptychia polydona (Mabille, 1887)

Dedov, Ivailo, Vu, Quang Manh, Le, Chi Toan, Tra, Van Tung & Szekeres, Miklos, 2025, The Clausiliidae (Gastropoda: Stylommatophora) of the Tam Dao National Park, Vietnam, Acta Zoologica Bulgarica 77 (1), pp. 41-48 : 42

Notoptychia polydona (Mabille, 1887)

( Fig. 1B )

Clausilia polydona Mabille, 1887a: 45

Type locality: “ Tonkin ”.

Locality data: Tam Dao N. P., rain forest, 800–900 m, leg. A. Napolov 1998; Tam Dao N. P., forest – 1 km NE of the centre of the resort (21.4607°N 105.6488°E), 1060 m, leg. R. Bekchiev, I. Dedov, M. Langurov & N. Simov 2023 ( Fig. 2A, B ); Tam Dao N. P., forest 2.1 km north of the centre of the resort (21.4733°N 105.6394°E), 980 m, leg. R. Bekchiev, I. Dedov, M. Langurov & N. Simov 2023 ( Fig. 2C ); Tam Dao N. P., forest 1.4 km north of the centre of the resort (21.4672°N 105.6440°E), 1010 m, leg. R. Bekchiev, I. Dedov, M. Langurov & N. Simov 2023.

Distribution: The species occurs sporadically in Bac Kan, Lang Son, Thai Nguyen, Son La and Hoa Binh Provinces.

Habitat: Undisturbed forests, under and inside decaying tree trunks.

Remark: This species was described from a gastropod material collected by Benedict Balansa in Tonkin and provided without more precise locality data ( Mabille 1887a, 1887b). However, the species diversity of Balansa’s material suggests that all of the samples originate from the central part of Lang Son Province. So far, N. polydona is known only from Vietnam but occurrence data near the borders suggest its possible presence in Guangxi Province ( China) and Houaphanh Province ( Laos).

Figures

Fig. 1. Species of the family Clausiliidae. A. Tropidauchenia giardi (comparative material, China, Guangxi Province, Longzhou County, Wude Xiang). B. Notoptychia polydona, Tam Dao N. P., 1 km NE of the centre of the resort, 1060 m. C. Oospira semipolita, Tam Dao N. P., 800–900 m. D. Oospira vanbuensis, Tam Dao N. P., 800–900 m. E. Phaedusa dichroa, Tam Dao N. P., 800–900 m. F. Phaedusa lypra, Tam Dao N. P., 800–900 m. G. Phaedusa paviei, Tam Dao N. P., 800–900 m. H. Phaedusa phongthoensis (comparative material, Lai Chau Province, Phong Tho). I. Phaedusa stenothyra (comparative material, Ninh Binh Province, Cuc Phuong National Park). J. Selenophaedusa thatkheana (comparative material, Yen Bai Province, Luc Yen District). K. Synprosphyma gastrum, Tam Dao N. P., 1 km NE of the centre of the resort, 1060 m. Scale bar: 10 mm.

Fig. 2. Habitats sampled during the 2023 survey. A. Habitat of Notoptychia polydona and Synprosphyma gastrum, 1 km NE of the centre of Tam Dao Resort, 1060 m. B. Microhabitats with decaying wood and tree fungi at the same site. C. Habitat of Notoptychia polydona, 2.1 km north of the centre of Tam Dao Resort, 980 m. D. Habitat of Oospira vanbuensis in the yard of the Quang Minh Hotel in Tam Dao Resort, 970 m.