Cranial morphology of the Carboniferous rhizodontidScrebinodus ornatus(Osteichthyes: Sarcopterygii)

Autor:	Jonathan E. Jeffery
Rok vydání:	2012
Předmět:	Sarcopterygii Rhizodontida biology Rhizodus Acanthostega Paleontology Zoology Cleithrum Anatomy Strepsodus biology.organism_classification Tetrapod Kenichthys
Zdroj:	Journal of Systematic Palaeontology. 10:475-519
ISSN:	1478-0941 1477-2019
DOI:	10.1080/14772019.2011.595961
Popis:	Well-preserved material is described of several specimens of Screbinodus ornatus, a small (approximately 1.5 metres long) rhizodontid sarcopterygian, from the Visean (Mississippian, Carboniferous) of Scotland. This species shows numerous ‘typical’ rhizodontid characteristics, such as post-parietals with a median ‘tail’, pectoral lepidotrichia with elongated basal segments, large symphysial tusks on the dentary and a ‘reverse’ overlap relationship between the cleithrum and clavicle. It also shows several characters unknown in other rhizodontids, such as the loss of the extratemporal and subopercular, and the probable exclusion of the postorbital from the orbital margin. A phylogenetic analysis finds that rhizodontids are the sister group to all other members of the tetrapod total group (with the exception of Kenichthys). This confirms that resemblances between derived rhizodontids and digited stem-tetrapods such as Acanthostega (noted by several previous authors) are due to convergence. A second analysis f...
Databáze:	OpenAIRE
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