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A Checklist and Classification of Terrestrial Prosobranch Snails from Son La, North-Western Vietnam

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A Checklist and Classification of Terrestrial Prosobranch Snails from Son La, North-Western Vietnam Ruthenica, 2015, vol. 25, No. 4: 117-132. © Ruthenica, 2015 Published online December 1, 2015. http: www.ruthenica.com A checklist and classification of terrestrial prosobranch snails from Son La, north-western Vietnam DO Duc Sang1*, NGUYEN Thi Hong Thinh1, DO Van Nhuong2 1Department of Zoology, Faculty of Biology, Tay Bac University, VIETNAM, 2Faculty of Biology, Hanoi National University of Education, VIETNAM (*corresponding author, E-mail: [email protected]) ABSTRACT. Son La is a province in the north-western the use of geographic names. The systematic ar- Vietnam; the mountain chain running in the north-west rangement at family group levels is based on Bouchet – south-east direction has very little known so far and Rocroi [2005], while genera and species are diverse terrestrial snail fauna dominated by endemic arranged alphabetically. The list includes 42 spe- species. This is the first checklist of the terrestrial proso- cies, belonging to 17 genera in five families. branch snails from Son La. It includes 42 species, be- longing to 17 genera in five families, of which three species are endemic (Dioryx vanbuensis, Cyclophorus Material and methods implicatus, and Scabrina vanbuensis). In this study Terrestrial prosobranch snails were sampled two species are recorded for the first time for Vietnam throughout Son La province, in 2010-2014. Col- (Chamalycaeus paviei, Scabrina laciniana) and 32 additional species are added to the species list of the lecting was done in various habitats including lime- Son La. stone forests, caves, and limestone karsts. Com- plete adult shells were counted for whorl number (W), and measured for shell height (H), shell width (W), and aperture width (WA). Introduction Materials examined in this study are deposited in the following institutions: SORC, Soil Organism Son La is a province in the north-western Viet- Research Center of Hanoi National University of nam, with a territory of 14,125 km2. Son La topog- Education (HNUE); VNMN, The Vietnam National raphy is deeply differentiated, forming many val- Museum of Nature; HNUEM, Hanoi National Uni- leys, basins, alternating mountains with an average versity of Education Museum of Biology. elevation of 700 m a.s.l., and variety of different Zoogeographical remarks. On the basis of the kinds of habitats, e.g. natural forest, limestone moun- analysis of known ranges of species, four zoogeo- tains, plantation, disturbed habitats. Thus, it is be- graphical regions of northern Vietnam (with corre- lieved that Son La has rich fauna of land snails, sponding provinces) may be recognized: which is little known so far. 1. North-eastern Tonkin: Cao Bang, Ha Giang, The study of the terrestrial snails of the north- Lang Son, Bac Kan, Ha Nam, Ha Noi, Vinh Phuc, west of Vietnam, and of the wider Vietnam regions, Phu Tho; has a long and rich history, extending back to the 19th 2. North-western Tonkin: Dien Bien, Lai Chau, century. Virtually all of our current knowledge of the Son La, Hoa Binh, Lao Cai; diversity and distribution of the Son La snail fauna is 3. Coastal north-eastern Tonkin: Quang Ninh, based on the publication and collections of 19th centu- Hai Phong; ry and early 20th century workers, particularly those 4. Southern Tonkin and northernmost Annam: of A. Bavay, Ph. Dautzenberg, H. Fischer, L. Mor- Thanh Hoa, Ninh Binh, Hoa Binh. let, L. Pfeiffer, E.A. Smith, P. Fischer, O.F. Möllen- dorff, and J. Mabille. Despite the fact that the study of Vietnam terrestrial prosobranch snails is still in its Systematic part infancy, there is a need for at least a provisional Class Gastropoda Cuvier, 1795 checklist as a starting point for further studies. The Clade Caenogastropoda Cox, 1960 present paper aims at providing such a list. Superfamily Cyclophoroidea J.E. Gray, 1847 The data included here are based on published Family CYCLOPHORIDAE J.E. Gray, 1847 records and field investigations from 2012-2015 by Subfamily Alycaeinae Blanford, 1864 the authors. The list provides taxonomic notes where necessary, as well as distribution ranges of genera Remark. Some authors have erroneously at- and species. An attempt was made to standardize tributed Alycaeinae to Gray, 1850. However, ac- 118 Do D.S., Nguyen T.H.T., Do V.N. cording to Boucher and Rocroi [2005] the correct Dimensions: H 3, W 5, WA 2 mm authorship is of W.T. Blanford, 1864 [Budha et al., Distribution. N Vietnam (Ninh Binh, Thanh Hoa, 2015]. Alycaeinae comprises four genera namely Son La: Copia natural reserve, Van Ho district). Alycaeus J.E. Gray, 1850, Chamalycaeus Kobelt et Remark. New distribution records from Son Möllendorff, 1897, Cipangocharax Shintaro, 1934, La. and Dioryx Benson, 1859. Currently, three genera Chamalycaeus paviei of Alycaeinae have been recorded from Vietnam: (Bavay et Dautzenberg, 1912) Alycaeus, Chamalycaeus, and Dioryx [Kobelt, 1902; (Fig. 1D) Vermeulen, Maassen, 2003; Dang, 2008; Tarruella, Lleixà, 2011]. Bavay, Dautzenberg, 1912: 50, pl. VI, fig. 5-8 [Alycaeus]. Type locality. Xieng khouang, Laos. Genus Chamalycaeus Kobelt et Möllendorff, 1897 Dimensions: H 4.5-5.0, W 5.0-6.0, WA 2.3-2.5 mm. Type species. Alycaeus andamaniae Benson, Distribution. Laos; Vietnam (Son La: Song Ma, 1861 [subsequent designation (SD), Wenz, 1938] Van Ho, Moc Chau, Yen Chau, Mai Son and Thuan Distribution. India, Nepal, Myanmar, China, Tai- Chau districts). wan, Korea, Thailand, Laos, Philippines, Indonesia, Remark. New record for Vietnam. Malaysia, Australia, and Vietnam [Kobelt, Möllen- dorff, 1897; Kobelt, 1902; Yen, 1939; Budha et al., Chamalycaeus sp. 1 2015]. (Fig. 1E) Chamalycaeus depressus Dimensions: H 3.0-3.3, W 6.0-6.2, WA 2.1-2.3 (Bavay et Dautzenberg, 1912) mm. (Fig. 1A) Distribution. N Vietnam (Son La: Moc Chau and Na San plateaus, Yen Chau district). Bavay, Dautzenberg, 1912 : 51, pl. VI, fig. 10-13 (Alycaeus). Chamalycaeus sp. 2 Type locality. Bac Ha, Lao Cai, Vietnam. (Fig. 1F) Dimensions: H 2.0-2.2, W 3.5-4.2, WA 1.5-1.6 mm. Dimensions. H 2.8-3.0, W 5.0-5.4, WA 2.2-2.3 Distribution. N Vietnam (Lao Cai, Son La: Van mm. Ho, Moc Chau and Thuan Chau districts). Distribution. N Vietnam (Son La: Pa Che village, Remark. This species was known only from Van Ho commune, Van Ho district). NW Tonkin region. New distribution records from Son La. Genus Dioryx Benson, 1859 Chamalycaeus fraterculus Type species. Cyclostoma distortus Haines, 1855 (Bavay et Dautzenberg, 1900) (SD, Gude, 1921). (Fig. 1B) Distribution. Myanmar, Laos, China, Malaysia, Bavay, Dautzenberg, 1900: 120, pl. XI, fig. 11-14 [Alycaeus Taiwan, Vietnam [Kobelt, Möllendorff, 1897; Ko- (Charax)]; Kobelt, 1902: 370 [Alycaeus (Dicharax)]; belt, 1902; Yen, 1939; Dang, 2008; Tarruella, Lleixà, Dang, 2008: 9, 11 [Alycaeus (Charax)]; Tarruella, Lleixà, 2011; Budha et al., 2015]. 2011: 72 (Alycaeus). Dioryx compactus (Bavay et Dautzenberg, 1900) Type locality. Tonkin, Vietnam. (Fig. 2A) Dimensions: H 2.4-3.0, W 4.6-5.0, WA 1.8-2.0 mm. Bavay, Dautzenberg, 1900: 119, pl. XI, fig. 9-10 [Alycaeus Distribution. N Vietnam (Ninh Binh, Quang Ninh, (Dioryx)]; Kobelt, 1902: 337 (Dioryx); Dang, 2008: 9 Thanh Hoa, Son La: Copia natural reserve, Son La [Alycaeus (Dioryx)]; Tarruella, Lleixà, 2011: 75. pass area). Type locality. Bac Kan, Vietnam. Remark. New distribution records from Son Dimensions: H 6.5-7.0, W 5.5-6.0, WA 3.5-4.0 La. mm. Distribution. N Vietnam (Bac Kan, Son La: Lime- Chamalycaeus heudei stone forest areas). (Bavay et Dautzenberg, 1900) Remark. This species was known only from (Fig. 1C) NW Tonkin and NE Tonkin regions. New distribu- Bavay, Dautzenberg, 1900: 121, 458, pl. XI, fig. 15-18 [Aly- tion records from Son La. caeus (Charax)]; Kobelt, 1902: 372 [Alycaeus (Di- charax)]; Dang, 2008: 9, 11 [Alycaeus (Charax)]; Tar- Dioryx messageri (Bavay et Dautzenberg, 1900) ruella, Lleixà, 2011: 72 (Alycaeus). (Fig. 2B) Type locality. Tonkin, Vietnam. Bavay, Dautzenberg, 1900: 119, pl. XI, fig. 7-8 [Alycaeus Checklist of terrestrial prosobranch gastropods from Son La, NW Vietnam 119 FIG. 1. A. Chamalycaeus depressus, B. Chamalycaeus fraterculus, C. Chamalycaeus heudei, D. Chamalycaeus paviei, E. Chamalycaeus sp. 1, F. Chamalycaeus sp. 2. РИС. 1. A. Chamalycaeus depressus, B. Chamalycaeus fraterculus, C. Chamalycaeus heudei, D. Chamalycaeus paviei, E. Chamalycaeus sp. 1, F. Chamalycaeus sp. 2. 120 Do D.S., Nguyen T.H.T., Do V.N. (Dioryx)]; Kobelt, 1902: 339 (Dioryx); Dang, 2008: 9 Distribution. Subtropical and tropical Asia [Ko- [Alycaeus (Dioryx)]; Tarruella, Lleixà, 2011: 75, fig. 4D. belt, Möllendorff, 1897; Kobelt, 1902; Yen, 1939; Type locality. That Khe, Trang Diònh, Lang Nantarat et al., 2014; Raheem et al., 2014; Budha et Son, Vietnam. al., 2015]. Dimensions. H 8.5-10.0, W 6.5-8.0, WA 4.0-5.0 Remark. Cyclophorus is the most species rich mm. genus in the Cyclophoridae encompassing about Distribution. N Vietnam (Lang Son, Ninh Binh, 180 nominal species [Nantarat et al., 2014]. Quang Ninh, Thanh Hoa, Son La: Quynh Nhai, Van Ho and Thuan Chau districts). Cyclophorus cambodgensis Morlet, 1884 Remark. New distribution records from Son (Fig. 2E) La. Morlet, 1884: 388, pl. XI, fig. 3, 3a; Fischer, 1891: 102; Ko- belt, Möllendorff, 1897: 105 [Cyclophorus (Litostylus) Dioryx vanbuensis (Bavay et Dautzenberg, 1900) cambodjensis]; Kobelt, 1902: 98; Dang, 2008: 11. (Fig. 2C) Type locality. Cambodia. Bavay, Dautzenberg, 1900: 120, pl. XI, fig. 19-21 [Alycaeus Dimensions: H 29-35, W 33-44, WA 23-26 mm. (Dioryx)]; Kobelt, 1902: 340 (Dioryx); Dang, 2008: 9 (Alycaeus); Tarruella, Lleixà, 2011: 75. Distribution. Cambodia, Vietnam (Ninh Binh, Quang Ninh, Thanh Hoa, Dong Nai, Kien Giang, Type locality. Ta Bu, Muong La, Son La, Viet- Son La: Limestone forest areas). nam. Remark. Widely distributed from Cambodia to Dimensions: H 5.0-6.0, W 5.0-6.2, WA 3.0-3.2 N and S Vietnam.
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