The first proven oxychilid land snail endemic to China (Eupulmonata, Gastrodontoidea).

Min Wu,Zhengping Liu

doi:10.3897/zookeys.870.32903

Abstract

A new and the first proven oxychilid species endemic to China is reported from Sichuan Province. Sinoxychilusgen. nov. is established based on this new species and has diagnostic traits of the sculptured protoconch, partial epiphallus wrapped by developed penis sheath, penial retractor muscle inserting on the top of penial caecum, spinelets on penial pilasters, absence of epiphallic papilla and perivaginal gland present on vagina and proximal bursa copulatrix duct. In light of shell morphology and through geometric morphometric analyses, Zonites scrobiculatus scrobiculatus Gredler and Z. scrobiculatus hupeina Gredler are proposed to be included in the new genus. A phylogenetic inference based on ITS2 gene indicates that the new genus is systematically close to Oxychilus Fitzinger, which is known from the Western Palearctic and the Southwestern Arabian Peninsula, regions that are geographically far from the distribution range of the new genus.

Highlights

The family Oxychilidae Hesse, 1927 is one of the three families under the superfamily Gastrodontoidea Tryon, 1866 and is distributed in the Western Palearctic and the Southwestern Arabian Peninsula (Neubert 1998; Schileyko 2003)
The living specimens were relaxed by drowning in water before being transferred to 70% ethanol which was replaced with ethanol of the same concentration after three days
Each 25 μL PCR mixture consisted of 12.5 μL cwbio 2× Es Taq MasterMix Dye, 9.5 μL ddH2O, 1 μL template DNA, 1 μL forward primer (10μL/L) (5′-CTAGCTGCGAGAATTAATGTGA-3′, Wade and Mordan 2000) and 1 μL reverse primer (10 μL/L) (5′-ACTTTCCCTCACGGTACTTG-3′; Wade and Mordan 2000)

Summary

Introduction

The family Oxychilidae Hesse, 1927 is one of the three families under the superfamily Gastrodontoidea Tryon, 1866 (sensu Bouchet et al 2017) and is distributed in the Western Palearctic and the Southwestern Arabian Peninsula (Neubert 1998; Schileyko 2003). 1859 (N and Central China, Guangdong) as a Hyalina species (Gredler 1881a, 1881b). Heude (1882) described 13 new species of Hyalina, namely H. planula (Ningguo, Anhui), H. rathouisii (near Shanghai), H. planata (Hunan), H. mamillaris (Hunan), H. sinensis, H. zikaveiensis (Shanghai), H. sekingeriana (Ningguo, Anhui), H. colombeliana (Yixing, Jiangsu), H. bambusicola (Ningguo, Anhui), H. spelaea (Guanyinmen, Nanjing, Jiangsu), H. castaneola (Qingyang, Anhui), H. imbellis (Ningguo, Anhui), and H. gredleriana (Hunan), and treated Helix rejecta and Helix miliaria Gredler, 1881 as species of Hyalina.

Results

Conclusion