Amphidromus (Syndromus) xiengkhaungensis Inkhavilay & Panha, 2017

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 : 35-36

Amphidromus (Syndromus) xiengkhaungensis Inkhavilay & Panha sp. nov.

urn:lsid:zoobank.org:act:7BA4B989-3003-4F09-94E5-F21B392BEA28

Figs 1 , 13 S–T; Table 1

Diagnosis

The new species is superficially similar to A. roemeri , but the distinguishing characters are a relatively large and thick shell, dark to brownish spire, Bands 2 and 3 merged and become tinted pink stained, with a pale tinted pink lip. In contrast, A. roemeri shows a relatively small and thin shell, whitish ground color, Bands 2 and 3 absent, and has a white lip. Amphidromus xiengkhaungensis sp. nov. differs from A. sinensis and A. flavus by having an ovated conic shell, Bands 2 and 3 stained with tinted pink, ovate aperture and slightly angular last whorl. In comparison, A. sinensis and A. flavus have an elongate conical, relatively small and thin shell, with a yellowish color and rounded last whorl. In addition, A. globonevilli differs from this new species by having a small and thin shell, with a yellowish color, last whorl rounded and Bands 2 and 3 absent.

Etymology

The specific epithet ‘ xiengkhaungensis ’ refers to the type locality of the new species.

Type material

Holotype

LAOS: shell height 25.6 mm, shell width 15.6 mm, with 6 whorls ( CUMZ 7045 , Fig. 13S ).

Paratypes

LAOS: 10S shells ( CUMZ 7046, Fig. 13T ); 2S shells ( NHMUK).

Type locality

LAOS: limestone outcrop at Ban Nong Tang, Phou Kood District, Xieng Khaung, 19°30′59.2″ N, 102°53′37.6″ E, 1140 m amsl.

Description

Shell sinistral, ovate conical, rather thick and glossy. Apex acute, color tinted pink; spire conical with dark color; suture wide and depressed. Whorls 5 and 6 nearly smooth; last whorl slightly angular. Periostracum thin, corneous and transparent. Earlier whorls with darker color; varix absent. Shell banding without Band 1; Bands 2 and 3 merged and becoming tinted pink stained; Bands 4 and 5 dark brown; Band 6 absent. Parietal callus thin and transparent to slightly thick and white. Aperture ovate; peristome expanded and weakly thickened; lip pale tinted pink to white. Columella straight, thickend and white. Umbilicus narrowly opened.

Remarks

Amphidromus xiengkhaungensis sp. nov. is currently known from the type locality only, a dry green forest and isolated limestone forest surrounded by a reservoir and agricultural areas. The empty shells were found on the floor among the leaf litter. Unfortunately, no living specimens have been collected.

Figures

Fig. 1. Distribution map of Amphidromus spp. in Laos recognized in this study.

Fig. 13. Shells of Amphidromus (Syndromus) spp. A−C. Amphidromus xiengensis Morlet, 1891. A. Lectotype (MNHN-IM-2000-5249). B. Specimen from Thailand (CUMZ 7050). C. Specimen from Tam Chiang Dao, Chiangmai, Thailand (CUMZ 7034). D−F. Amphidromus xiengensis var. “clausus” Pilsbry, 1900. D. Lectotype (ANSP 31496). E. Specimen from Ban Na Deauy, Luang Phrabang, Laos (CUMZ 7036). F. Specimen from Pha Tang, Prayao, Thailand (CUMZ 7052). G–H. Amphidromus xiengensis var. “multifasciata” Fulton, 1896 from Phu Nang National Park, Phayao, Thailand (CUMZ 7038). I−M. Amphidromus fuscolabris Möllendorff, 1898. I. Holotype (SMF 7641). J−M. Specimens from Ban Phon, Sekong, Laos (CUMZ 7041–7042). N. Amphidromus eudeli Ancey, 1897, syntype from Binh Dinh, Annam (RBINS 617427). O–P. Amphidromus haematostoma Möllendorff, 1898. O. Lectotype (SMF 7559). P. Paralectotype (SMF 7560). Q–R. Amphidromus haematostoma var. “varians” Möllendorff, 1898. Q. Lectotype (SMF 7561). R. Paralectotype (SMF 7562). S–T. Amphidromus xiengkhaungensis sp. nov. S. Holotype (CUMZ 7045). T. Paratype (CUMZ 7046).