干旱区生态环境知识资源中心(Arid): Sequence of post-moult exoskeleton hardening preserved in a trilobite mass moult assemblage from the Lower Ordovician Fezouata Konservat-Lagerstatte, Morocco

Arid

DOI	10.4202/app.00582.2018
	Sequence of post-moult exoskeleton hardening preserved in a trilobite mass moult assemblage from the Lower Ordovician Fezouata Konservat-Lagerstatte, Morocco
	Drage, Harriet B.1; Vandenbroucke, Thus R. A.2; Van Roy, Peter 2; Daley, Allison C.3
通讯作者	Drage, Harriet B.
来源期刊	ACTA PALAEONTOLOGICA POLONICA
ISSN	0567-7920
EISSN	1732-2421
出版年	2019
卷号	64 期号:2 页码:261-273
英文摘要	Euarthropods have a tough exoskeleton that provides crucial protection from predation and parasitism. However, this is restrictive to growth and must be periodically moulted. The moulting sequence is well-known from extant arthropods, consisting of: (i) the long inter-moult stage, in which no changes occur to the hardened exoskeleton; (ii) the pre-moult stage where the old exoskeleton is detached and the new one secreted; (iii) exuviation, when the old exoskeleton is moulted; and (iv) the post-moult stage during which the new exoskeleton starts as soft, thin, and partially compressed and gradually hardens to the robust exoskeleton of the inter-moult stage. Trilobite fossils typically consist of inter-moult carcasses or moulted exuviae, but specimens preserving the post-moult stage are rare. Here we describe nine specimens assigned to Symphysurus ebbestadi representing the first group of contemporaneous fossils collected that preserve all key stages of the moulting process in one taxon, including the post-moult stage. They were collected from a single lens in the Tremadocian part of the Fezouata Shale Formation, Morocco. Based on cephalic displacement and comparison to other trilobite moults, one specimen appears to represent a moulted exoskeleton. Four specimens are typical inter-moult carcasses. Four others are wrinkled and flattened, with thin exoskeletons compared to inter-moult specimens, and are considered post-moult individuals. These S. ebbestadi specimens illuminate the preservation and morphology of the post-moulting stage, characterised by strong anterior-posterior exoskeleton wrinkling, as well as overall body flattening and reduced visibility of thoracic articulations. Being found in the same lens, these specimens likely represent the first preserved in-the-act mass moulting event. The displayed sequence of moulting suggests the moulting process in trilobites was comparable to modern arthropods, and conserved within euarthropod evolutionary history.
英文关键词	Trilobita mass moult soft-shelled post-moult moulting exoskeleton Ordovician Morocco
类型	Article
语种	英语
国家	England ; Belgium ; Switzerland
开放获取类型	Green Published, Green Submitted, gold
收录类别	SCI-E
WOS记录号	WOS:000470965100004
WOS关键词	SHALE LOWER ORDOVICIAN ; DESERT SCORPION ; FINE-STRUCTURE ; ANTI-ATLAS ; PALEOECOLOGY ; BEHAVIOR ; ECDYSIS ; CUTICLE ; RECORD ; TAPHONOMY
WOS类目	Paleontology
WOS研究方向	Paleontology
来源机构	University of Oxford
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/213854
作者单位	1.Univ Oxford, Dept Zool, South Parks Rd, Oxford OX1 3PS, England; 2.Univ Ghent, Dept Geol, Campus Sterre, B-9000 Ghent, Belgium; 3.Univ Lausanne, Inst Earth Sci, CH-1015 Lausanne, Switzerland
推荐引用方式 GB/T 7714	Drage, Harriet B.,Vandenbroucke, Thus R. A.,Van Roy, Peter,et al. Sequence of post-moult exoskeleton hardening preserved in a trilobite mass moult assemblage from the Lower Ordovician Fezouata Konservat-Lagerstatte, Morocco[J]. University of Oxford,2019,64(2):261-273.
APA	Drage, Harriet B.,Vandenbroucke, Thus R. A.,Van Roy, Peter,&Daley, Allison C..(2019).Sequence of post-moult exoskeleton hardening preserved in a trilobite mass moult assemblage from the Lower Ordovician Fezouata Konservat-Lagerstatte, Morocco.ACTA PALAEONTOLOGICA POLONICA,64(2),261-273.
MLA	Drage, Harriet B.,et al."Sequence of post-moult exoskeleton hardening preserved in a trilobite mass moult assemblage from the Lower Ordovician Fezouata Konservat-Lagerstatte, Morocco".ACTA PALAEONTOLOGICA POLONICA 64.2(2019):261-273.