Bony-fish-like scales in a Silurian maxillate placoderm.
Journal
Nature communications
ISSN: 2041-1723
Titre abrégé: Nat Commun
Pays: England
ID NLM: 101528555
Informations de publication
Date de publication:
22 Nov 2023
22 Nov 2023
Historique:
received:
12
06
2023
accepted:
13
11
2023
medline:
24
11
2023
pubmed:
23
11
2023
entrez:
22
11
2023
Statut:
epublish
Résumé
Major groups of jawed vertebrates exhibit contrasting conditions of dermal plates and scales. But the transition between these conditions remains unclear due to rare information on taxa occupying key phylogenetic positions. The 425-million-year-old fish Entelognathus combines an unusual mosaic of characters typically associated with jawed stem gnathostomes or crown gnathostomes. However, only the anterior part of the exoskeleton was previously known for this very crownward member of the gnathostome stem. Here, we report a near-complete post-thoracic exoskeleton of Entelognathus. Strikingly, its scales are large and some are rhomboid, bearing distinctive peg-and-socket articulations; this combination was previously only known in osteichthyans and considered a synapomorphy of that group. The presence in Entelognathus of an anal fin spine, previously only found in some stem chondrichthyans, further illustrates that many characters previously thought to be restricted to specific lineages within the gnathostome crown likely arose before the common ancestor of living jawed vertebrates.
Identifiants
pubmed: 37993457
doi: 10.1038/s41467-023-43557-9
pii: 10.1038/s41467-023-43557-9
pmc: PMC10665347
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
7622Subventions
Organisme : National Natural Science Foundation of China (National Science Foundation of China)
ID : 42130209
Organisme : China Postdoctoral Science Foundation
ID : 2022M720215
Informations de copyright
© 2023. The Author(s).
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