Bradybaena linjun Wu & Chen
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publication ID |
https://dx.doi.org/10.3897/zookeys.861.35430 |
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publication LSID |
lsid:zoobank.org:pub:DAD076A6-B8B7-4FEE-94C4-CFB56E0B6338 |
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persistent identifier |
https://treatment.plazi.org/id/834A1B9F-7272-4188-9FD5-2121A9D26443 |
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taxon LSID |
lsid:zoobank.org:act:834A1B9F-7272-4188-9FD5-2121A9D26443 |
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treatment provided by |
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scientific name |
Bradybaena linjun Wu & Chen |
| status |
sp. nov. |
Bradybaena linjun Wu & Chen sp. nov. Figs 1 View Figure 1 , 7 View Figure 7 , 8 View Figure 8 , 9 View Figure 9 , 10 View Figure 10
Material examined.
Holotype, fma (HBUMM08241-specimen 1, Fig. 7A View Figure 7 ). 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 View Figure 7 ), the same collection information as holotype. Foot muscle was cut off and preserved in 99.7% alcohol at -20 °C (HBUMM08242).
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 View Figure 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 View Figure 8 , 9F View Figure 9 ). A high head wart between ommatophores present ( Fig. 8A, C View Figure 8 ). On corresponding internal body wall no particular structure present ( Fig. 8D View Figure 8 ). On left side of mantle edge, a leaf-shaped appendage present ( Fig. 8B View Figure 8 , 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 View Figure 9 ).
Genitalia ( Fig. 9 View Figure 9 ). Membranous sac surrounding terminal genitalia present ( Fig. 9A, B View Figure 9 ). 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 View Figure 9 ). Penis internally with numerous crossing pilasters of equal thickness that form a network ( Fig. 9D View Figure 9 ). Dart sac present. Love dart spoon-shaped, hollow and C-shaped in cross section (observed in holotype, Fig. 9E View Figure 9 ). Accessory sac invisible externally ( Fig. 9C View Figure 9 ). 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 View Figure 9 ); 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 View Figure 10 ). A large number of broken shells, presumably caused by bird predation, were observed at the type locality.
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 View Figure 8 ). 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 View Figure 3 ). 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 Möllendorff, 1884 than in Bradybaena where only four species exhibit double bands, namely B. billiana (Heude, 1882), B. mimicula (Heude, 1888), B. diplodesma ( Möllendorff, 1899), B. sueshanensis Pilsbry, 1934 ( Heude 1882, 1888; Möllendorff 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.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.