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2024-03-05Zeitschriftenartikel DOI: 10.18452/28550
The origin and evolution of Cynodontia (Synapsida, Therapsida): Reassessment of the phylogeny and systematics of the earliest members of this clade using 3D-imaging technologies
dc.contributor.authorPusch, Luisa C.
dc.contributor.authorKammerer, Christian
dc.contributor.authorFröbisch, Jörg
dc.date.accessioned2024-04-22T12:44:42Z
dc.date.available2024-04-22T12:44:42Z
dc.date.issued2024-03-05none
dc.date.updated2024-04-16T08:06:16Z
dc.identifier.issn1932-8486
dc.identifier.urihttp://edoc.hu-berlin.de/18452/29185
dc.description.abstractThe origin of cynodonts, the group ancestral to and including mammals, is one of the major outstanding problems in therapsid evolution. One of the most troubling aspects of the cynodont fossil record is the lengthy Permian ghost lineage between the latest possible divergence from its sister group Therocephalia and the first appearance of definitive cynodonts in the late Permian. The absence of cynodonts and dominance of therocephalians in middle Permian strata has led some workers to argue that cynodonts evolved from within therocephalians, rendering the latter paraphyletic, but more recent analyses support the reciprocal monophyly of Cynodontia and Therocephalia. Furthermore, although a fundamental dichotomy in the derived subclade Eucynodontia is well‐supported in cynodont phylogeny, the relationships of more stemward cynodonts from the late Permian and Early Triassic are unresolved. Here, we provide a re‐evaluation of the phylogeny of Eutheriodontia (Cynodontia + Therocephalia) and an assessment of character evolution within the group. Using computed tomographic data derived from extensive sampling of the earliest known (late Permian and Early Triassic) cynodonts and selected exemplars of therocephalians and later (Middle Triassic onwards) cynodonts, we describe novel aspects of the endocranial anatomy of these animals. These data were incorporated into a new phylogenetic data set including a comprehensive sample of early cynodonts. Our phylogenetic analyses support some results previously recovered by other authors, but recover therocephalians as paraphyletic with regards to cynodonts, with cynodonts and eutherocephalians forming a clade to the exclusion of the “basal therocephalian” families Lycosuchidae and Scylacosauridae. Though both conservatism and homoplasy mark the endocranial anatomy of early non‐mammalian cynodonts, we were able to identify several new endocranial synapomorphies for eutheriodont subclades and recovered generally better‐supported topologies than previous analyses using primarily external craniodental characters.eng
dc.description.sponsorshipDeutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659
dc.language.isoengnone
dc.publisherHumboldt-Universität zu Berlin
dc.rights(CC BY 4.0) Attribution 4.0 Internationalger
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectcomputed tomographyeng
dc.subjectendocranial anatomyeng
dc.subjectEutheriodontiaeng
dc.subjectPermianeng
dc.subjectphylogenyeng
dc.subjectTriassiceng
dc.subject.ddc570 Biologienone
dc.titleThe origin and evolution of Cynodontia (Synapsida, Therapsida): Reassessment of the phylogeny and systematics of the earliest members of this clade using 3D-imaging technologiesnone
dc.typearticle
dc.identifier.urnurn:nbn:de:kobv:11-110-18452/29185-6
dc.identifier.doihttp://dx.doi.org/10.18452/28550
dc.type.versionpublishedVersionnone
local.edoc.pages97none
local.edoc.type-nameZeitschriftenartikel
local.edoc.container-typeperiodical
local.edoc.container-type-nameZeitschrift
dc.description.versionPeer Reviewednone
dc.identifier.eissn1932-8494
dcterms.bibliographicCitation.doi10.1002/ar.25394
dcterms.bibliographicCitation.journaltitleThe anatomical recordnone
dcterms.bibliographicCitation.volume307none
dcterms.bibliographicCitation.issue4none
dcterms.bibliographicCitation.originalpublishernameWiley-Lissnone
dcterms.bibliographicCitation.originalpublisherplaceHoboken, NJnone
dcterms.bibliographicCitation.pagestart1634none
dcterms.bibliographicCitation.pageend1730none

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