Exites in Cambrian arthropods and homology of arthropod limb branches.
Journal
Nature communications
ISSN: 2041-1723
Titre abrégé: Nat Commun
Pays: England
ID NLM: 101528555
Informations de publication
Date de publication:
30 07 2021
30 07 2021
Historique:
received:
01
04
2021
accepted:
14
07
2021
entrez:
31
7
2021
pubmed:
1
8
2021
medline:
18
8
2021
Statut:
epublish
Résumé
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.
Identifiants
pubmed: 34330912
doi: 10.1038/s41467-021-24918-8
pii: 10.1038/s41467-021-24918-8
pmc: PMC8324779
doi:
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
4619Informations de copyright
© 2021. The Author(s).
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