Exites in Cambrian arthropods and homology of arthropod limb branches.

Autor: Liu Y; Yunnan Key Laboratory for Palaeobiology, Institute of Palaeontology, Yunnan University, Kunming, China.; MEC International Laboratory for Palaeobiology and Palaeoenvironment, Yunnan University, Kunming, China., Edgecombe GD; MEC International Laboratory for Palaeobiology and Palaeoenvironment, Yunnan University, Kunming, China. g.edgecombe@nhm.ac.uk.; Department of Earth Sciences, The Natural History Museum, London, UK. g.edgecombe@nhm.ac.uk., Schmidt M; MEC International Laboratory for Palaeobiology and Palaeoenvironment, Yunnan University, Kunming, China.; Bavarian State Collection of Zoology, Bavarian Natural History Collections, München, Germany.; Department Biology II, Ludwig-Maximilians-Universität München, Planegg-Martinsried, München, Germany., Bond AD; Department of Earth Sciences, Royal Holloway University of London, Egham, Surrey, UK., Melzer RR; MEC International Laboratory for Palaeobiology and Palaeoenvironment, Yunnan University, Kunming, China.; Bavarian State Collection of Zoology, Bavarian Natural History Collections, München, Germany.; Department Biology II, Ludwig-Maximilians-Universität München, Planegg-Martinsried, München, Germany.; GeoBio-Center, Ludwig-Maximilians-Universität München, München, Germany., Zhai D; Yunnan Key Laboratory for Palaeobiology, Institute of Palaeontology, Yunnan University, Kunming, China.; MEC International Laboratory for Palaeobiology and Palaeoenvironment, Yunnan University, Kunming, China., Mai H; Yunnan Key Laboratory for Palaeobiology, Institute of Palaeontology, Yunnan University, Kunming, China.; MEC International Laboratory for Palaeobiology and Palaeoenvironment, Yunnan University, Kunming, China., Zhang M; Yunnan Key Laboratory for Palaeobiology, Institute of Palaeontology, Yunnan University, Kunming, China.; MEC International Laboratory for Palaeobiology and Palaeoenvironment, Yunnan University, Kunming, China., Hou X; Yunnan Key Laboratory for Palaeobiology, Institute of Palaeontology, Yunnan University, Kunming, China. xghou@ynu.edu.cn.; MEC International Laboratory for Palaeobiology and Palaeoenvironment, Yunnan University, Kunming, China. xghou@ynu.edu.cn.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2021 Jul 30; Vol. 12 (1), pp. 4619. Date of Electronic Publication: 2021 Jul 30.
DOI: 10.1038/s41467-021-24918-8
Abstrakt: The last common ancestor of all living arthropods had biramous postantennal appendages, with an endopodite and exopodite branching off the limb base. Morphological evidence for homology of these rami between crustaceans and chelicerates has, however, been challenged by data from clonal composition and from knockout of leg patterning genes. Cambrian arthropod fossils have been cited as providing support for competing hypotheses about biramy but have shed little light on additional lateral outgrowths, known as exites. Here we draw on microtomographic imaging of the Cambrian great-appendage arthropod Leanchoilia to reveal a previously undetected exite at the base of most appendages, composed of overlapping lamellae. A morphologically similar, and we infer homologous, exite is documented in the same position in members of the trilobite-allied Artiopoda. This early Cambrian exite morphology supplements an emerging picture from gene expression that exites may have a deeper origin in arthropod phylogeny than has been appreciated.
(© 2021. The Author(s).)
Databáze: MEDLINE
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