Camaena maguanensis Zhou, Wang & Hu, 2020

Wang, Pei, Hu, Mei-Ling, Lin, Jun-Hong, Yang, Hai-Fang, Li, Xiao-Jing & Zhou, Wei-Chuan, 2020, Descriptions of four new dextral land snails of the genus Camaena (Gastropoda, Eupulmonata, Camaenidae) from south China, ZooKeys 996, pp. 37-58 : 37

publication ID	https://dx.doi.org/10.3897/zookeys.996.54187
publication LSID	lsid:zoobank.org:pub:CF98F8DE-F863-419E-B904-183D85779CAB
persistent identifier	https://treatment.plazi.org/id/EC5431C5-CFB6-4309-80C1-0CF8F3C9BE0E
taxon LSID	lsid:zoobank.org:act:EC5431C5-CFB6-4309-80C1-0CF8F3C9BE0E
treatment provided by	ZooKeys by Pensoft
scientific name	Camaena maguanensis Zhou, Wang & Hu
status	sp. nov.

Treatment

Camaena maguanensis Zhou, Wang & Hu sp. nov. Figures 3C View Figure 3 , 4 View Figure 4 , 5C View Figure 5 , 8 View Figure 8 , Tables 3, 4, 5

Type material.

Holotype. [FJIQBC 19405] Shell height 19.2 mm, shell width 39.0 mm, height of aperture 12.0 mm, width of aperture 16.5 mm, 16 April 2015, collected from the type locality.

Paratype. [FJIQBC 19406] 1 live adult; [FJIQBC 19407-19413] 7 empty shells: 5 adults, 2 juveniles.

Type locality.

Huazhige, Maguan, Wenshan, Yunnan, China (22°57'24.48"N, 104°21'12.96"E).

Etymology.

The name of the new species refers to the type locality.

Diagnosis.

Shell. Shell dextral, large, thin, fragile, and glossy, low and flat conical. 4.5 whorls, the front whorls increasing slowly. Spire relatively low. Body whorl rapidly expanded. Shell yellowish with unclear growth lines and spiral bands on the surface. Apex quite blunt. Suture shallow. The protoconch surface smooth, some short growth lines visible near the two sides of suture under 32 × stereomicroscope. Last whorl with quite acute carina at periphery and a shallow groove-like depression above and below the carina. No band on the carina, but several reddish brown and sparse spire bands below the carina. Aperture crescent-shaped. Peristome reflected, white and thick. Columellar lip reflected. Umbilicus reddish brown, open, large and only 2/5 covered. Inner lip attached to the body whorl, forming translucent callus.

Soft body. Light yellowish brown with black lines. Tentacles dark.

Reproductive system. Bursa copulatrix oval, small, with quite long and tapering pedunculus. Flagellum long, tapering distally. Vas deferens long and thin. Epiphallus medium thickness and length. Penis retractor muscle very short and slender. Penis long with a short protrusion at the middle. Inner penial wall with longitudinal, slightly straight and smooth pilasters. Verge circular, somewhat small, opened basally, extending from the base to the end.

Habitat.

The species was found on limestone in Maguan county of Yunnan province, China.

Distribution.

Only known from the type locality.

Remarks.

Camaena maguanensis sp. nov. is clearly different from other dextral camaenids with a lower conical shell. In particular, C. maguanensis sp. nov. has a large and open umbilicus, which distinguishes it from C. longsonensis and C. jinpingensis . Although the umbilicus of C. maguanensis sp. nov. is similar to that of C. vorvonga , some differences are obvious. For example, C. maguanensis sp. nov. has no spiral band on the carinate periphery of the body whorl but some spaced bands at the base. The shell of C. maguanensis sp. nov. is yellowish, but that of C. gaolongensis sp. nov. is dark brown. On the other hand, C. maguanensis sp. nov. has a circular and slightly smaller verge.

P -distances of the COI gene between this new species and the other dextral species are 0.068-0.198 (Table 3 View Table 3 ), and that between C. maguanensis sp. nov. and C. yulinensis sp. nov. is 0.108, also exceeding 0.059 (currently the maximum differentiation value (p-distance) of Camaenidae ) ( Criscione and Köhler 2014), and the topology of the phylogenetic tree also supports the new species.