期刊
HISTORICAL BIOLOGY
卷 32, 期 2, 页码 174-186出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/08912963.2018.1476857
关键词
Arthricocephalus chauveaui; ontogeny; trilobite; Cambrian; South China
资金
- National Sciences Foundation of China [40672005, 41172005, 41222013]
- Major State Basic Research Development Programme of Ministry of Science and Science and Technology of China [2013CB835002, 2015FY310100-5]
- Guizhou Science and Technology Department, China [Gui, Sci. Z.[2014]4003, Gui Sci G[2017] 5788]
- China Geological Survey [DD20160120-04]
The morphology and trunk development of the trilobite Arthricocephalus chauveaui described herein are based on 216 articulated specimens collected from the Lazizhai section of the Balang Formation (Stage 4, Series 2 of the Cambrian) in Jianhe County, Guizhou Province, South China. The new specimens exhibit a relatively complete ontogenetic sequence ranging from the protaspid to holaspid periods and reveal more morphological changes of the species in detail. For example, from degrees 0 to 4, the facial sutures are proparian and then gradually move backward from degree 5, until in the holaspid period, the suture becomes gonatoparian. Based on both linear measurements, we investigate here the morphological variation of some cranial traits throughout ontogeny. Our results demonstrate that the allometric growth pattern shows continuous variations, some of which are related to trunk development. By exploring the trunk segmentation in A.chauveaui, the developmental mode shows that somitogenesis and tagmosis may have developed independently at each meraspid degree beyond degree 0. The holaspid period is consistent with the beginning of the epimorphic phase.
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