Two new camaenid land snails (Eupulmonata) from Central China Author Wu, Min Author Chen, Zheyu Author Zhu, Xiaoran text ZooKeys 2019 861 129 144 http://dx.doi.org/10.3897/zookeys.861.35430 journal article http://dx.doi.org/10.3897/zookeys.861.35430 1313-2970-861-129 DAD076A6B8B74FEE94C4CFB56E0B6338 Bradybaena linjun Wu & Chen sp. nov. Figs 1 , 7 , 8 , 9 , 10 Material examined. Holotype , fma (HBUMM08241-specimen 1, Fig. 7A ). Hubei Province, Yichang, Changyang Tujia Autonomous Prefecture, Longzhoupin; 31°28'9"N , 111°11'14"E , 103 m a. s. l.; 2018-VII; coll. Chen, Zheyu. Paratype , 1 fma (HBUMM08241-specimen 2, Fig. 7B ), the same collection information as holotype. Foot muscle was cut off and preserved in 99.7% alcohol at -20 °C (HBUMM08242). Figure 7. Bradybaena linjun Wu & Chen, sp. nov. A holotype, HBUMM08241-specimen 1 B paratype, HBUMM08241-specimen 2. Diagnosis . Shell depressed; dextral. Columella oblique. Periphery rounded. A peripheral and a supraperipheral chestnut band present. Penis internally with numerous crossing pilasters of equal thickness that form a network. Love dart hollow and C-shaped in cross section. Accessory sac externally invisible. Mucous glands two, very short thyrsiform (not branched) tubes; entering accessory sac through simple pore. Shell about 4.5 whorls, breadth 13-17 mm. Description. Shell ( Fig. 7 ). Depressed; thin; dextral. Whorls convex. Suture impressed. Half umbilicus covered by reflexed columellar lip. Columella oblique. Proto conch not granulate, smooth. Teleoconch with dense spiral furrows. Aperture oblique; not sinuate at peristome. Body whorl slightly descending behind aperture. Shell surface without ribs. Growth lines fine. Adult shell not hairy or scaly. Adult body whorl rounded at periphery; basally convex. Ring-like thickening within aperture absent. Peristome thin; slightly reflexed. Callus thin and transparent. Shell glossy; uniformly brownish yellow; with a peripheral and a supraperipheral chestnut bands. Measurements (holotype is larger in size): shell height 8.8-10.7 mm, shell breadth 13.2-16.6 mm, aperture height 5.9-6.0 mm, aperture width 7.0-9.7 mm, embryonic shell whorls 1.625, whorls 4.250-4.625, shell height/ breadth ratio 0.64-0.67. General anatomy ( Figs 8 , 9F ). A high head wart between ommatophores present ( Fig. 8A, C ). On corresponding internal body wall no particular structure present ( Fig. 8D ). On left side of mantle edge, a leaf-shaped appendage present ( Fig. 8B , arrowed). Body light brown; with whitish striae posterior to wart. Sole creamy white. Jaw arcuate; with about thirteen more or less projecting ribs ( Fig. 9F ). Figure 8. Bradybaena linjun Wu & Chen, sp. nov., holotype, HBUMM08241-specimen 1. A, C showing head wart B leaf-shaped appendage (arrowed) on left margin of mantle D internal body wall between ommatophore insertions, showing no gland. Figure 9. Bradybaena linjun Wu & Chen, sp. nov., holotype, HBUMM08241-specimen 1. A, B both sides of genitalia, general view C bottom of dart apparatus, showing mucous glands insertion D penis, exposed E love dart in cross section F jaw. Scale bars: 1 mm. At - atrium; BCD - bursa copulatrix duct; DS - dart sac; DVM - membranous sac surrounding terminal genitalia; Ep - epiphallus; FO - free oviduct; MG - mucous glands; P - penis; PR - penial retractor muscle; PS - penis sheath; Va - vagina; VD - vas deferens. Genitalia ( Fig. 9 ). Membranous sac surrounding terminal genitalia present ( Fig. 9A, B ). Penis sheath about 1/3 penis length. Penis very thick; externally simple. Penial retractor muscle inserting on epiphallus. Epiphallus slightly thicker than vas deferens. Flagellum absent. Epiphallic papilla absent ( Fig. 9D ). Penis internally with numerous crossing pilasters of equal thickness that form a network ( Fig. 9D ). Dart sac present . Love dart spoon-shaped, hollow and C-shaped in cross section (observed in holotype, Fig. 9E ). Accessory sac invisible externally ( Fig. 9C ). Poly-layered structure present between mucous gland insertion and vagina. Mucous glands two tubes; much shorter than dart sac in length; each thyrsiform rather than branched ( Fig. 9A, C ); entering accessory sac through simple pore. Vagina about half of penis in length. Measurement of holotype: DS- 4.6 mm long, 1.4 mm broad; MG- 1.7 mm; PS- 1.2 mm; P- 7.1 mm; Ep- 2.6 mm; VD- 21.5 mm; PR- 1.7 mm; Va- 4.5 mm; FO- 2.8 mm. Etymology. The new species is named after the legendary tribal leader "Lin-Jun ( 廪君)" of the Tujiazu people who live at the type locality. Distribution. Hubei (Changyang), only known from the type locality. Ecology . This species was found living in a well-established secondary forest, on limestone cliffs, often in cracks ( Fig. 10 ). A large number of broken shells, presumably caused by bird predation, were observed at the type locality. Figure 10. Bradybaena linjun Wu & Chen, sp. nov., holotype, HBUMM08241-specimen 1. Habitat, photographer Zheyu Chen. Taxonomic remarks. The new species is assigned to Bradybaena because of the presence of a smooth protoconch, membranous sac surrounding terminal genitalia, poly-layered structure in dart apparatus, two mucous glands and the absence of a flagellum; characters that are consistent with the type of the genus B. similaris ( Wu 2004 ). On the left side of the mantle edge, this species possesses a leaf-shaped appendage ( Fig. 8B ). The existence of this structure in other bradybaenine genera is not known except in Sinochloritis lii Wu & Chen, gen. & sp. nov. described here ( Fig. 3D, E ). In our other work on Bradybaena this structure is observed ( Bradybaena sp., HBUMM06125, Wuyuan, Jiangxi Province, 147 m, 29°22'18.8"N , 118°02'45.2"E , 2007-V-26; unpublished data). Only a few Chinese species in the subfamily Bradybaeninae have double bands. The double-banded shells occur more frequently in Cathaica Moellendorff , 1884 than in Bradybaena where only four species exhibit double bands, namely B. billiana (Heude, 1882), B. mimicula (Heude, 1888), B. diplodesma ( Moellendorff , 1899), B. sueshanensis Pilsbry, 1934 ( Heude 1882 , 1888 ; Moellendorff 1899 ; Pilsbry 1934 ). Although the new species has double bands, in aspect of shell morphology it most resembles B. qixiaensis Wu & Asami, 2017. However, the new species has very short mucous glands which are proportionally the shortest in the subfamily Bradybaeninae , the thyrsiform mucous gland duct, and the spoon-shaped love dart, which distinguish this species from all Chinese Bradybaena species with known genital anatomy.