青南、藏北中侏罗世缅甸贝内部构造的研究及修订

通过缅甸贝内部构造及解剖学特征的研究和对比,对该属进行了修订和整理.发现过去置于该属中的90余种实际上包括了现在理解的9个以上属的内容.经与相近属内部和外部特征的比较,对缅甸贝的起源和演化做了初步研究.提出该属在晚 Bajocian 期起源于 Formosarhynchia,早 Bathonian 期得到了爆发性的发展和辐射,并在中、晚 Bathonian 期朝3个方向演化.通过对该属时空分布、共生生物、群落结构、伴生沉积岩及介壳稳定同位素和微量元素的综合分析,认为 Burmirhynchia-Holcothyris 群落主要生活于近岸浅水、含盐度偏低、水深可能小于 30m 的低能环境.

A STUDY ON INTERNAL STRUCTURES OF GENUS BURMIRHYNCHIA BUCKMAN, 1918 (BRACHIOPODA) FROM MIDDLE JURASSIC OF NORTHERN QINGHAI-XIZANG PLATEAU WITH REVISIONS

As one of the most important middle Jurassic rhynchonellids in the Tethys, Burmirhynchia has constituted together with Holcothyris in the Lower Bathonian of the northern Qinghai-Xizang (Tibet) Plateau a prominent shallow-water benthic community, which is distributed markedly in a strip exten- ding from Indo-China westwards to northern Burma, western Yunnan, eastern and northern Xizang (Tibet), southern Qinghai, Pamirs and central Asia, and is roughly paralell to the coast-line of that time.