A NEW FUSULINOIDEAN GENUS DILATOFUSULINA FROM THE LOPINGIAN (UPPER PERMIAN) OF SOUTHERN TIBET, CHINA
A NEW FUSULINOIDEAN GENUS DILATOFUSULINA FROM THE LOPINGIAN (UPPER PERMIAN) OF SOUTHERN TIBET, CHINA
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DOI：
10.2113/gsjfr.39.1.56
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发表时间：
2009
影响因子：
1.1
通讯作者：
Yue Wang;K. Ueno
中科院分区：
文献类型：
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作者：
Yue Wang;K. Ueno
新的 boultoniid 属 Dilatofusulina 是根据中国西藏南部 Lopingian（上二叠统）Gyanyima 组的标本建立的。该属与 Codonofusiella 和 Parananlingella 有点相似，但其不同之处在于具有快速扩张但完全卷曲的后半卷。它可能代表了 Boultoniidae 科 Nanlingella-Parananlingella 谱系的高级分支。根据其系统发育位置以及与Colaniella parva的共现性，该属可指长兴阶晚期（相当于华南的Palaofusulina sinensis带）。迄今为止，已知产于西藏南部的嘉尼玛、中国青海省的天峻县和玛多县以及印度喜马拉雅拉达克的拉马由鲁。这些现象表明古地理分布仅限于特提斯海的北部和南部边缘。
The new boultoniid genus Dilatofusulina is established based on specimens from the Lopingian (Upper Permian) Gyanyima Formation in southern Tibet, China. This genus is somewhat similar to Codonofusiella and Parananlingella , but it is distinct in having a rapidly expanding but fully coiled last half volution. It probably represents an advanced offshoot of the Nanlingella-Parananlingella lineage in the family Boultoniidae. Based on its phylogenetic position and co-occurrence with Colaniella parva , this genus is referable to the late Changhsingian Stage (equivalent to the Palaeofusulina sinensis Zone in South China). To date, it is known from Gyanyima in southern Tibet, from Tianjun and Maduo Counties in Qinghai Province, China, and from Lamayuru in Himalayan Ladakh, India. These occurrences indicate a paleogeographic distribution limited to the northern and southern margins of the Tethys Sea.