First confident evidence of moulting in eodiscid trilobites from the Cambrian Stage 3 of South China

IF 2 3区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Geological Magazine Pub Date : 2023-10-19 DOI:10.1017/s0016756823000584
Yifan Wang, Jorge Esteve, Xinglian Yang, Rongxing Yu, Dezhi Wang
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Abstract

Abstract 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.
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华南寒武纪第三期eodid三叶虫蜕皮的首个可靠证据
摘要三叶虫的换羽行为已被广泛研究。然而,三叶虫的蜕皮却鲜为人知。本文报道了华南寒武纪第2系第3期牛蹄堂组和明新司组的2个三叶虫(Tsunyidiscus niutitangensis和Tsunyidiscus sp.),它们的外骨骼排列表明,这2个标本属于轻度扰动和未扰动的外骨骼。牛提唐纲纲鱼头下单位(LCU)的印模显示吻侧板。蜕皮显示LCU在躯干下方倒转。面部和吻侧缝合线的打开将允许外骨骼部分登记的后外生三叶虫的出现。此外,我们的发现表明,在寒武纪时期,除了红叶三叶虫、冠叶三叶虫和拟叶三叶虫之外,还存在一种利用面部和吻侧缝合线形成前口的Somersault构造。
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来源期刊
Geological Magazine
Geological Magazine 地学-地球科学综合
CiteScore
4.70
自引率
0.00%
发文量
111
审稿时长
3 months
期刊介绍: Geological Magazine, established in 1864, is one of the oldest and best-known periodicals in earth sciences. It publishes original scientific papers covering the complete spectrum of geological topics, with high quality illustrations. Its worldwide circulation and high production values, combined with Rapid Communications and Book Review sections keep the journal at the forefront of the field. This journal is included in the Cambridge Journals open access initiative, Cambridge Open Option.
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