【摘要】 早、中寒武世广泛分布于全球的无腹大型双瓣壳节肢动物吐卓虫(Tuzoia),壳体由左右两壳瓣组成,多保存为单壳瓣,壳的中部有一具刺的侧脊,壳面多具网状的壳饰;吐卓虫(Tuzoia)生活于浅水或深水区,是一个广相性的节肢动物。凯里市西北郊翁岭塘下寒武统(或华南寒武系新地层系统的黔东统)杷榔组上部灰绿色粉砂质泥岩、页岩中产有与这个属的模式种Tuzoia retifera Walcott,1912非常相似的一相似种Tuzoiacf.T.retifera Walcott1912.这是Tuzoia在较深水相杷榔组的初次发现,是目前所知在贵州的最低产出层位,丰富了杷榔组生物的组成面貌,也是中国华南地区早寒武世吐卓虫(Tuzoia)向东扩散并由浅水向深水迁移的证据。更多还原

【Abstract】 Tuzoia(bivalved arthropods)simply consists of left and right valves-like s hells.The animal has a straight or slightly convex hinge-line,pointed antero-and postero-dorsal cardinal processes,and a keel in mid-dorsal shell.The surface of carapace is covered by fine anastomosing polygonal ridges and equipped with spines on dorsum,lateral ridge and ventral margins.Tuzoia is widely distributed in the world,yielded mainly from the Early—Middle Cambrian formations.In China it is has been found at Yentai,Liaoning,Northeast China and at Kunming,Yunan and at Taijian,Guizhou,South China.The new material of Tuzuia dealt with in this paper was collected from the upper part of the lower Cambrian Balang Formation-in the northwest of Kaili City,Guizhou Province.The specimens are from two separate horizons in the Wenglingtang section,and are assigned as Tuzoia cf.retifera Walcott 1912 and T.sp.respectively.They are associated with Redlichia(Pteroredlichia),Arthricocephalus chauveaui and are late Canglangpuian in age.Tuzoia is probably a swimming animal which lived in the shallow water platform and the deep-water slope areas in inner and outer shelfs.The new finding extends geographical distribution of Tuzoia in southwest China onto Kaili City,and provides information on the eastwatd immigration of the animal from a shallow-water to a deep-water environment during early Cambrian.更多还原