期刊
PALAEONTOLOGY
卷 54, 期 -, 页码 1279-1288出版社
WILEY-BLACKWELL
DOI: 10.1111/j.1475-4983.2011.01102.x
关键词
Trilobita; Eodiscina; ontogeny; somitogenesis; Lower Cambrian; South China
类别
资金
- Natural Science Foundation of China (NSFC) [40872004, 40925005, 40830208]
- Ministry of Science and Technology of China [2006CB806400]
The morphology and ontogeny of the eodiscid trilobite Tsunyidiscus acutus Sun is described on the basis of numerous calcified specimens collected from the Lower Cambrian Shuijingtuo Formation in Yichang and Changyang, Hubei Province, South China. An ontogenetic series is established based on the articulated material including the previously unknown protaspides and meraspides (degrees 0 and 1). The material, revealing some prominent morphological changes such as the number of pygidial axial rings, genal spines retained throughout ontogeny and pygidial pleurae from furrowed to unfurrowed, enables a discussion on the trunk segmentation schedule, indicating that somitogenesis and tagmosis occurred independently during the ontogenetic development of T. acutus.
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