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中国尖缘螺属一新种记述(柄眼目, 琥珀螺科)
李成有, 郭阳阳, 张卫红
新疆大学 生命科学与技术学院
摘要:
作者利用形态解剖和扫描电镜方法对采自新疆五家渠市琥珀螺科(Succineidae)一未知种类进行了研究。结果如下: 该种贝壳长卵圆形, 黄棕色, 壳质薄, 半透明, 中等大小, 壳高12.56~15.10 mm, 壳宽6.48~7.72 mm, 有2.8~3.1 个螺层; 软体密布色素点, 整体黑褐色; 阴茎较短, 绝大多数个体阴茎一侧扩展呈片状沿纵向与囊状的另一侧相折叠; 阴茎附属物片状, 长度约为阴茎长度的1/4; 阴茎基背板长, 在阴茎鞘中折叠6~7次; 阴茎内部具数条纵褶, 阴茎内表面密布微小乳状突。结果显示该种属于尖缘螺属(Oxyloma), 与该属已报道的相近种差异明显, 为一新种, 即五家渠尖缘螺(Oxyloma wujiaquensis sp. nov.)。模式标本保存于新疆大学生命科学与技术学院。
关键词:  琥珀螺科(Succineidae)  尖缘螺属(Oxyloma)  新种  新疆
DOI:10.11759/hykx 20170807001
分类号:
基金项目:国家自然科学基金项目(31260506)
A new species of Oxyloma from Xinjiang (Stylommatophora: Succineidae)
LI Cheng-you, GUO Yang-yang, ZHANG Wei-hong
Abstract:
An unknown species of Succineidae collected in Wujiaqu City, Xinjiang was studied by anatomical morphology and SEM (scanning electron microscope) methods. The results were as follow: Its shell was elongate-ovate, yellowish-brown, thin, translucent, medium (12.56~15.10 mm in height, 6.48~7.72 mm in width, SW/SH 0.44~0.58), with about 2.8~3.1 whorls. Its soft body was dark-brown with dense pigmentation. Its penis was relatively short. When the penial sheath was removed, it was observed that one side of the penis of most individuals extends to slice-shaped and folds on the other side along the longitudinal direction. The penial appendix was slice-shaped and about a quarter the length of the penis. Epiphallus was coiled and long with 6~7 twists in the penial sheath. There were several longitudinal folds inside the penis and the internal surface of the penis was distributed with numerous minute papillae. The seminal vesicles were bilobed in most cases. The results indicated that this species was assigned to Oxyloma and distinguished obviously from other similar species. It was reported as a new species in this paper, namely Oxyloma wujiaquensis sp. nov. The specimens were deposited in the College of Life Science and Technology, Xinjiang University. Type locality and habitat: The specimens were found near Qinggeda Lake of Wujiaqu City (44°07.531′N, 87°34.196′E), Xinjiang, China, on 14th June 2015, on the water plant and stone surface of a roadside ditch, in wet grassland and on moist bottom surface of a dry irrigation ditch of a rice field. Only two species of Oxyloma have been reported in China, Oxyloma indica (Pfeiffer, 1849) and Oxyloma pfeiffrei (Rossmaessler, 1835). The two species are similar with the new species in terms of shell size and shape, but obviously differ with it by morphological and anatomical characters: Shell of O. indica (height 10.50~14.50 mm, width 5.00~7.30 mm) is reddish or light-brown, with 2.5 whorls. Its penis is longer and epiphallus is shorter (only with two twists). The penial appendix is finger-shaped. Shell of O. pfeifferi (height 15.00 mm, width 7.50 mm) is opaque, deep reddish or pale yellow in color. Its penis is longer (3.5~4.0 mm) with irregular crystals on the internal surface of the penis, and epiphallus is longer. Furthermore, the penis of both O. indica and O. pfeifferi are not folded longitudinally, not as that of the new species.
Key words:  Succineidae  Oxyloma  new species  Xinjiang
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