Endocranial Morphology and Phylogeny of Palaeozoic Gnathostomes (Jawed Vertebrates)

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Fältnamn	Indikatorer	Metadata
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003		SwePub
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020		a 9789155473303q print
024	7	a https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-93602 URI
040		a (SwePub)uu
041		a engb eng
042		9 SwePub
072	7	a vet2 swepub-contenttype
072	7	a dok2 swepub-publicationtype
100	1	a Brazeau, Martin D.,d 1981-u Uppsala universitet,Evolutionär organismbiologi4 aut
245	1 0	a Endocranial Morphology and Phylogeny of Palaeozoic Gnathostomes (Jawed Vertebrates)
264	1	a Uppsala :b Acta Universitatis Upsaliensis,c 2008
300		a 50 s.
338		a electronic2 rdacarrier
490	0	a Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology,x 1651-6214 ;v 570
520		a Gnathostomes, or jawed vertebrates, make up the overwhelming majority of modern vertebrate diversity. Among living vertebrates, they comprise the chondrichthyans (“cartilaginous fishes” such as sharks, skates, rays, chimaeras) and the osteichthyans (“bony fishes” or bony vertebrates, inclusive of tetrapods). Gnathostomes appear to have originated in the early Palaeozoic Era, but their early fossil record is fairly scant. The best fossils appear first in the Late Silurian and Devonian periods. Much of gnathostome diversity owes to unique adaptations in the internal skeleton of their head (the endocranium). The endocranium is composed of the braincase, jaws, hyoid arch, and branchial arches, which sometimes fossilise when they are composed of bone or calcified cartilage. The purpose of this thesis is to describe and compare the fossilised cranial endoskeletons of a variety of different Palaeozoic gnathostomes. The objective is to test current conceptions of gnathostome interrelationships (i.e. phylogeny) and infer aspects of key morphological transformations that took place during the evolution of Palaeozoic members of this group. Two key areas are examined: the morphology and interrelationships of Palaeozoic gnathostomes and the morphology of the visceral arches in sarcopterygian fishes. New data on the visceral arches are described from the stem tetrapods Panderichthys and rhizodontids. These provide insight into the sequence of character acquisition leading to the tetrapod middle ear. Panderichthys shows key features of the tetrapod middle ear chamber were established prior to the origin fo digited limbs. New morphological data are described from the “acanthodian” fish Ptomacanthus. Ptomacanthus provides only the second example of a well-preserved braincase from any member of this group. It shows dramatic differences from that of its counterpart, Acanthodes, providing new evidence for acanthodian paraphyly. New interpretations of basal gnathostome and osteichthyan phylogeny are presented, challenging or enriching existing views of these problems.
650	7	a NATURVETENSKAPx Biologix Mikrobiologi0 (SwePub)106062 hsv//swe
650	7	a NATURAL SCIENCESx Biological Sciencesx Microbiology0 (SwePub)106062 hsv//eng
653		a systematics
653		a palaeontology
653		a anatomy
653		a evolution
653		a Organism biology
653		a Organismbiologi
700	1	a Ahlberg, Per,c Prof.u Uppsala universitet,Evolutionär organismbiologi4 ths
700	1	a Budd, Graham,c Dr.u Uppsala universitet,Paleontologigruppen4 ths
700	1	a Blom, Henning,c Dr.u Uppsala universitet,Evolutionär organismbiologi4 ths
700	1	a Coates, Michael,c Prof.u University of Chicago4 opn
710	2	a Uppsala universitetb Evolutionär organismbiologi4 org
856	4	u https://uu.diva-portal.org/smash/get/diva2:172797/FULLTEXT01.pdfx primaryx Raw objecty fulltext
856	4	u https://uu.diva-portal.org/smash/get/diva2:172797/COVER01.pdfy cover
856	4 8	u https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-9360

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