Abstract
The sinistral Camaena species are mainly distributed in southern China and northern Vietnam. There is a total of eight species or subspecies of sinistral Camaena recorded at present. By systematically collecting specimens in Guangdong, Guangxi and Yunnan in southern China and the northern areas in Vietnam, two new species, Camaena lingyunensis Zhou & Lin, sp. n. and Camaena detianensis Zhou & Lin, sp. n. have been discovered. These new species are here characterised based on the comparison of shells, their reproductive system, the molecular phylogenetic analyses of the mitochondrial genes COI and 16S, and the nuclear gene ITS2. Detailed descriptions of the morphological characters, the DNA sequences, and the habitat of the two new species are given. Differential comparisons with related species are provided as well as a key to the sinistral species of Camaena.
Highlights
The genus Camaena, which contains large dextral or sinistral shell, was established in 1850 by Albers, with the type species Helix cicatricosa Müller, 1774
The differences of shell between the new species and C. cicatricosa were as follows: (1) C. detianensis sp. n. is quite large, and the largest width can reach 62.5 mm, while the maximum width of shell of C. cicatricosa is less than 50 mm (2) The shell of this species is dark brown without spiral bands, while the shell of C. cicatricosa is yellowish brown, and contains many annular spiral bands (3) There is an acute carina at periphery of body whorl of the new species, and groove-like depression above and below the carina, but C. cicatricosa has no obvious carina
Two new species of sinistral Camaena were identified based on shell structure and colouration, reproductive system morphology, and molecular characteristics
Summary
The genus Camaena, which contains large dextral or sinistral shell, was established in 1850 by Albers, with the type species Helix cicatricosa Müller, 1774. Ding et al (2016) clarified the phylogenetic relationships and taxonomic status of the sinistral group with the help of comparative shell morphology, genital anatomy, and molecular phylogeny, and recognised it to contain four species, C. cicatricosa, C. inflata (Möllendorff, 1885), C. obtecta (Fischer, 1898) and C. connectens (Dautzenberg & Fischer, 1906). They described one new species C. poyuensis (Zhou, Wang & Ding, 2016). The details including morphological characteristics, DNA sequences, and habitat of these two new species are described
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
