摘要
大型双瓣壳节肢动物吐卓虫Tuzoia是一个形态丰富的属,广泛分布在北美、中国、澳大利亚和捷克的寒武系第二、三统中。文中报道了采自贵州剑河八郎"清虚洞组"的吐卓虫的2种:即Tuzoia jianheensis sp.nov.与T.bispinosa Yuan and Zhao,1999。新种的主要特征为中后刺、后腹刺细长,腹部边缘发育有锯齿状边缘刺,壳面网纹细密,不同于Tuzoia的其他种,有较强地域性。新种化石数量占优,占总数三分之二。T.bispinisa背缘发育有三角形或近三角形背刺,前后铰突发育,壳面的网纹以不规则六边形为主,网眼大。T.jianheensis sp.nov.与上覆凯里组的T.bispinosa对比研究,得出Tuzoia的壳长有变短的趋势。
Tuzoia occurs in strata of Cambrian Series 2 to 3 in North America, China, Australia and Czech Republic. This paper reports 2 species of Tuzoia from the ＂Tsinghsutung Formation＂ at Balang Village, Jianhe County of Guizhou： T. jianheensis sp. nov. and T. bispinosa Yuan and Zhao, 1999. T. jianheensis sp. nov. is characterized by midposterior spine and posteroventral spine both prominent and slender, ventral margins with denticulation ventral spines, and dense reticulate pattern on the surface of carapace, it is endemic. Specimens of T. jianheensis sp. nov. account for 2/3 are more abundant than those of T. bispinosa. T. bispinosa with strong triangular or subt- riangular dorsal spines along dorsal margin, anterior cardinal process broadbased, reticulate pattern large and are mainly in irregular hexagon. The comparison of Tuzoia between ＂Tsinghsutung Formation＂ and Kaili Formation concludes that the shell shape of Tuzoia gradually become shorter through the stratigraphy.
出处
《古生物学报》
CSCD
北大核心
2017年第3期301-311,共11页
Acta Palaeontologica Sinica
基金
国家重点基础研究发展规划项目(973)(2013CB835002
2015FY310100)
国家自然科学基金项目(41330101
41362002
41662001)
中国地质科学院全国地层委员会基金
贵州大学研究生创新基金(研理工2017043)联合资助
