Revision of three camaenid and one bradybaenid species (Gastropoda, Stylommatophora) from China based on morphological and molecular data, with description of a new bradybaenid subspecies from Inner Mongolia, China
Author
Wang, Pei
Author
Xiao, Qiong
Author
Zhou, Wei-Chuan
Author
Hwang, Chung-Chi
text
ZooKeys
2014
372
1
16
http://dx.doi.org/10.3897/zookeys.372.6581
journal article
http://dx.doi.org/10.3897/zookeys.372.6581
1313-2970-372-1
5766D7E9551345B49C2C23EC9571D857
Satsuma meridionalis (Moellendorff, 1884)
comb. n.
Figs 2B; 3B; 4B
Helix fortunei
var. meridionalis Moellendorff, 1884: 327, pl. 7, fig. 5.
Helix (Dorcasia) fortunei
var. meridionalis, Tryon, 1887: 208, pl. 47, fig. 51.
Helix (Euhadra) fortunei
var. meridionalis, Pilsbry, 1890: pl. 15, figs 69-70.
Eulota (Eulota) fortunei
var. meridionalis, Pilsbry, 1895: 204.
Bradybaena fortunei meridionalis
Yen, 1939: 134, pl. 13, fig. 66.
Bradybaena fortunei submeridionalis
Zilch, 1951: 86; Zilch, 1968: 183.
Bradybaena (Bradybaena) fortunei
Richardson, 1983: 27; Wu, 1999: 83-84, pl. 7B;
Chen and Zhang 2004
: 145-146, fig. 111.
Type locality.
Luofu Mountain, Guangdong (
23°16'03"N
,
114°03'37"E
), China.
Materials examined.
Luofu Mountain, Lectotype (SMF 9155), paralectotype (SMF 9156); Luofu Mountain, Guangdong (Nov. 3, 2010,
23°16'03"N
,
114°03'37"E
; FJIQBC 18407-18416).
Shell.
Sinistral,medium sized; about 11.0 mm in height, 15.2 mm in width, thin but solid, yellowish-brown in color, depressed conic; 5 1/2 whorls. Surface with dense growth lines and weak spiral lines. Spire slightly low conical, slowly increasing, slightly convex. Body whorl fast expanding, quite convex. With slight, slender and dull red band on periphery of body whorl for most specimens. Periphery bluntly angulated. Aperture descending and elliptical. Peristome thin, sharp, slightly reflected. Inner lip with thin callus. Columellar lip short, reflected, slightly covering umbilicus. Umbilicus deep, round, and about 1/5 of width of shell.
Reproductive system.
Penis thick and short, with an expanded base. Penial caecum short. Epiphallus slender, about 2/3 of length of penis. Flagellum short and small, about 1/10 of length of epiphallus. Penis retractor muscle thick and wide. Vas deferens long and slender. Oviduct thin. Vagina longer than penis, expanding at posterior end. Pedunculus of bursa copulatrix expanding at base. Bursa copulatrix oval.
Ecology
.
The species usually lives in the wet bushes and grass near farmland, especially on limestone cliffs and in cracks with more humus, or under rotten branches and fallen leaves; occasionally within human settlements. This snail is sensitive to low temperature, aestivates from November to March. Animals often feed on all kinds of crops, especially tender shoot and leaf.
Remark.
Originallyit was described as variety of
Helix fortunei
(Pfeiffer, 1850) for its uniformly yellowish-corneous color and globularly conic shell shape. Subsequently,
Yen (1939)
treated it as the subspecies
Bradybaena fortunei meridionalis
. However,
Chen and Zhang (2004)
rejected the subspecies arrangement and syonymized the name meriodionalis with
Bradybaena fortunei
. In the current study, we dissected the genitalia of the species, revealing lack of dart sac and mucus gland. Therefore, the species is now recognized as
Satsuma meridionalis
according to shell features, characters of genitalia and the molecular phylogeny (Fig. 5). We are unable to address the systematic relationships with
Bradybaena (Bradybaena) fortunei
from Shanghai for the lack of suitable material.