[关键词]
[摘要]
贵州东部寒武纪的杷榔组发育,化石丰富,含有杷榔动物群;其中掘头虫类、莱德利基虫类三叶虫保存好,序列完整,提供了研究这些类群属种个体发育的重要材料。本文据杷榔组Redlichia (Pteroredlichia) chinensis(Walcott,1905)的300多块标本的分析数据,详细讨论和重点研究了其从幼虫期、分节期至成虫期个体发育特征,分析各个阶段的形态变化及个体发育演化趋势。丰富了R.(Pteroredlichia) chinensis个体发育的资料,对莱德利基虫属种厘定起到积极的作用,提供了属种分类对比的重要证据。
[Key word]
[Abstract]
The Balang Formation is a fossiliferous unit and had a widely geographic distribution in eastern Guizhou, China. The Balang Fauna, which a Burgess Shale-type biota from the Cambrian Series 2 of Guizhou, yields in the middle and upper parts of the formation. The Balang Fauna consists of representatives of eight major groups, such as poriferans-chanceleoriids, sponge, cnidarians, priapulids, brachiopods, molluscs, arthropods, and echinoderms, except animals, including algae and trace fossils. Trilobites of arthropods is an important group. The trilobite sequence in the Balang Formation is continuous and preserved individuals of different ontogenetic stages, which provides important material for ontogenetic study of species–level from this group. Here, based on over 300 specimens, by methods of statistics, and combined evolutional characters of each stage, we mainly focus on the ontogenetic characters of Redlichia (Pteroredlichia) chinensis (Walcott, 1905), to describe characters of the protaspid, meraspid to holaspid periods of the species and analyze trends of their morphologic evolution. The new data enrich our understanding of ontogeny of R. (Pteroredlichia) chinensis and provide significant criteria for taxonomic identification.
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[基金项目]
国家自然科学基金(41672005;41172005; 4133101)、国家重点基础研究发展规划项目(973项目)(2013CB835002;2015FY310100-5)、贵州省科学技术厅基金(黔科合Z字[2014]4003号)和中国国家地层委员会基金联合资助。