期刊
GEOLOGICAL MAGAZINE
卷 160, 期 8, 页码 1441-1445出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0016756823000584
关键词
eodiscid trilobites; Somersault configuration; exuviae; Cambrian Stage 3; South China
This study reports on two specimens of eodiscid trilobites, which show a Somersault configuration using facial and rostral sutures to create an anterior exuvial gape. This discovery is important for understanding trilobite moulting behavior during the Cambrian period.
Trilobite moulting behaviour has been extensively investigated. However, exuviae in eodiscid trilobites are poorly known. Here, we report two eodiscid trilobite specimens, Tsunyidiscus niutitangensis and Tsunyidiscus sp., showing Somersault configuration from the Niutitang Formation and Mingxinsi Formation of South China, respectively (Cambrian Series 2, Stage 3). The arrangements of the exoskeletons indicate that the two specimens are the slightly disturbed and undisturbed exuviae. The impression of the lower cephalic unit (LCU) displays the rostral plate in Tsunyidiscus niutitangensis. The exuviae showing the LCU inverted anteriorly under the trunk. The opening of the facial and rostral sutures would have allowed the emergence of the post-ecdysial trilobite with the partial enrolment of exoskeleton. Moreover, our discovery indicates a Somersault configuration which employed the facial and rostral sutures to create an anterior exuvial gape that also exists in eodiscid trilobites besides redlichiid trilobites, corynexochid trilobites and ptychopariid trilobites during the Cambrian.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据