The Early Metazoan Biotas of Neoproterozoic-Cambrian in Guizhou
The fossil record of the origin and early diversification of the Metazoa is extremely rich in Guizhou Province,five exceptionally-preserved metazoan biotas have been discovered,in order of decreasing age,they are the Weng'an and the Miaohe(Jiangkou) Biotas of the Ediacaran,the Small Shelly Fauna of Cambrian Series 1,the Zunyi Biota of the lower Series 2 of Cambrian,the Balang Fauna of the upper Series 2 of Cambrian,the Taijiang Biota of the top Series 2 of Cambrian and the Kaili Biota of Cambrian Series 3.Except the Small Shelly Fauna and the Taijiang Biota,recently,significant progresses of the research on other biotas have been made.Together with other Biotas of south China,especially the Chengjiang and Gaojiashan Biotas constitute an evolutionary chain of early metazoans,which indicates the evolutionary sequence:the appearance of metazoans-the skeletonization of animals-the appearance of major phyla and classes of animals-the radiation and diversification of creatures and the complexity of ecological environment.
early Metazoanevolutionary sequencethe origin of animalsGuizhou
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