Amphidromus (Amphidromus) laosianus Bavay, 1898

Inkhavilay, Khamla, Sutcharit, Chirasak & Panha, Somsak, 2017, Taxonomic review of the tree snail genus Amphidromus Albers, 1850 (Pulmonata: Camaenidae) in Laos, with the description of two new species, European Journal of Taxonomy 330, pp. 1-40 : 10

publication ID	https://doi.org/10.5852/ejt.2017.330
persistent identifier	https://treatment.plazi.org/id/03DAD35F-692F-EF01-FE5E-AD4BFABF23D0
treatment provided by	Carolina (2020-05-15 19:57:01, last updated 2020-05-15 19:57:03)
scientific name	Amphidromus (Amphidromus) laosianus Bavay, 1898
status

Treatment

Figs 1, 4G

Amphidromus laosianus Bavay, 1898: 15 , 16, pl. 2, fig. 1, 1a. Type locality: Khône, sur les bords du Mékong [on the banks of the Mekong River, Khone, Champasak, Laos].

Amphidromus laosianus var. albocaerulescens Bavay, 1898: 16 , pl. 2, fig. 2, 2a. Type locality: Khône, sur les bords du Mékong [on the banks of the Mekong River, Khone, Champasak, Laos].

Amphidromus laosianus – Pilsbry 1900: 183, 184, pl. 62, figs 60–61. — Laidlaw & Solem 1961: 526, 634.

Amphidromus laosianus var. albocaerulescens – Pilsbry 1900: 184, pl. 62, figs 62–63. — Laidlaw & Solem 1961: 526, 598.

Material examined

LAOS: 1D + 1S shells ( Fig. 4G), Khone District, Champasak, South Laos ( RMNH 101049); 1D + 2S shells, W.J.M. Maassen collection; 2D + 2D juveniles, Khone, South Laos, ZMB, Lehmann collection.

Remarks

Currently known only from the type locality. The unique shell characters are chirally dimorphic, conical to elongate conical; whorls weakly convex, with white subsutural band. Shell color with yellowishbrown or brownish radial streaks on pinkish to whitish ground color; dark varix present. Aperture elongated; peristome thickened, expanded and reflected; lip folded and pinkish. Parietal callus pinkish and thickened; columella pinkish and straight; umbilicus imperforated.

Laidlaw & Solem (1961) mentioned that this species is similar to the A. atricallosus leucoxanthus variety “ laidlawi ” ( Solem 1965: pl. 1, fig. 3; Sutcharit & Panha 2006: fig. 4d–e). However, it differs in having a slender shell and pinkish peristome, parietal callus and inside of the aperture, while “ var. laidlawi ” has a white lip, parietal callus and inside aperture, and more depressed suture. Furthermore, A. cambojiensis (Reeve, 1860) can be distinguished from this species by having a very large and thickened shell, thickened and white parietal callus and lip, and purplish inside aperture (see Sutcharit et al. 2015).

References

Bavay A. 1898. Coquilles nouvelles provenant des recoltes de M. L. Levay dans le Haut-Mekong pendant la campagne du Massie (1893 - 95). Journal de Conchyliologie 46: 15 - 20. Available from http: // biodiversitylibrary. org / page / 15920414 [accessed 17 Jul. 2013].

Laidlaw F. F. & Solem A. 1961. The land snail genus Amphidromus: A synoptic catalogue. Fieldiana: Zoology 41: 507 - 677. Available from http: // biodiversitylibrary. org / item / 20789 [accessed 18 Jul. 2013].

Pilsbry H. A. 1900. Manual of Conchology, Structural and Systematic, with Illustrations of the Species, Second Series, Volume 13. Academy of Natural Sciences, Philadelphia. Available from http: // biodiversitylibrary. org / item / 16708 [accessed 1 Jan. 2013].

Solem A. 1965. Land snails of the genus Amphidromus from Thailand (Mollusca: Pumonata: Camaenidae). Proceedings of the United States National Museum 117: 615 - 628. Available from http: // biodiversitylibrary. org / page / 7759057 [accessed 8 Jun. 2016].

Sutcharit C. & Panha S. 2006. Taxonomic review of the tree snail Amphidromus Albers, 1850 (Pulmonata: Camaenidae) in Thailand and adjacent areas: Subgenus Amphidromus. Journal of Molluscan Studies 72: 1 - 30. https: // doi. org / 10.1093 / mollus / eyi 044

Sutcharit C., Ablett J., Tongkerd P., Naggs F. & Panha S. 2015. Illustrated type catalogue of Amphidromus Albers, 1850 in the Natural History Museum, London, and descriptions of two new species. ZooKeys 492: 49 - 105. https: // doi. org / 10.3897 / zookeys. 492.8641