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Deep origin of the crossed‐lamellar microstructure in early Cambrian molluscs
Frontiers Science Center for Deep Ocean Multispheres & Earth System Key Lab of Submarine Geosciences & Prospecting Techniques MOE & College of Marine Geosciences, Ocean University of China Qingdao 266100 China;Laboratory for Marine Mineral Resources Pilot National Laboratory for Marine Science & Technology (Qingdao) Qingdao 266237 China.ORCID-id: 0000-0002-8276-1000
Naturhistoriska riksmuseet, Enheten för paleobiologi.ORCID-id: 0000-0001-7366-7680
Naturhistoriska riksmuseet, Enheten för paleobiologi.ORCID-id: 0000-0001-6720-7418
2022 (Engelska)Ingår i: Palaeontology, ISSN 0031-0239, E-ISSN 1475-4983, Vol. 65, nr 4, artikel-id e12620Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Aragonitic crossed-lamellar (CL) is one of themost commonly formed and extensively studied molluscanshell microstructures, yet its origin and early evolution within the Mollusca remains poorly understood. Here, a primitive CL microstructure from one of the oldest gastropods,Pela-giella  madianensis, and the problematic hyolith Cupitheca sp. of the Cambrian Series 2 Xinji Formation on the North China Platform, was investigated. In P. madianensis, detailed characterization has revealed a typical four-ordered hierarchical orga-nization of aragonitic crystallites, and a thick layer of organic membranes surrounding its first-order lamellae. A transitional fibrous microstructure was observed between the outer CL and inner foliated aragonite structural layers. In Cupitheca sp.,only the first and second-order lamellae were visible due to preservation limitations, and the first-order lamellae were extremely irregular in shape and size, which is consistent with modern representatives. This study demonstrates that the capability to construct highly-mineralized intricate shells was acquired in early Cambrian stem-group gastropods. The CL microstructure first emerged in the early Cambrian and as a basal synapomorphic trait in total-group molluscs. Moreover, presence of the CL microstructure in problematic lophotrochozoans (i.e.hyoliths) is confirmed. This study contributes to a more complete picture of the evolutionary origin andarchitectural diversity of biomineralized mollusc shells during the Cambrian explosion, and strengthens the phylogenetic links between hyoliths and molluscs.

Ort, förlag, år, upplaga, sidor
London: The Palaeontological Association , 2022. Vol. 65, nr 4, artikel-id e12620
Nyckelord [en]
biomineralization, Cambrian explosion, crossed-lamellar microstructure, mollusc, hyolith
Nationell ämneskategori
Geologi Annan geovetenskap och miljövetenskap
Forskningsämne
Livets mångfald; Den föränderliga jorden
Identifikatorer
URN: urn:nbn:se:nrm:diva-4847DOI: 10.1111/pala.12620OAI: oai:DiVA.org:nrm-4847DiVA, id: diva2:1713248
Forskningsfinansiär
Vetenskapsrådet, 2016‐04610Vetenskapsrådet, 2017‐05183
Anmärkning

This research was funded by the National Natural Science Foundation of China (Grant nos. 41930319, 41890845, 42102012, 41621003 and 42072003); Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB26000000), 111 Project (Grant No. D17013), Swedish Research Council (Grant nos. VR2016-04610 and VR2017-05183) a Young Thousand Talents Plan of China (Grant No. 41720104002) and China Postdoctoral Science Foundation (Grant No. 2022M712987). 

Tillgänglig från: 2022-11-24 Skapad: 2022-11-24 Senast uppdaterad: 2022-12-04Bibliografiskt granskad

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Förlagets fulltexthttps://onlinelibrary.wiley.com/doi/full/10.1111/pala.12620

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Li, LuoyangSkovsted, ChristianTopper, Timothy
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