Sökning: L773:1871 174X OR L773:1875 5887 >
High resolution XCT...
High resolution XCT scanning reveals complex morphology of gnathal elements in an Early Devonian arthrodire
-
- Hu, Yu-Zhi (författare)
- Australian Natl Univ, Res Sch Earth Sci, Bldg 142 Mills Rd, Canberra, ACT 2601, Australia;Australian Natl Univ, Res Sch Phys & Engn, Bldg 60, Canberra, ACT 2601, Australia
-
- Young, G. C. (författare)
- Australian Natl Univ, Res Sch Phys & Engn, Bldg 60, Canberra, ACT 2601, Australia
-
- Burrow, Carole (författare)
- Queensland Museum, Geosci, 122 Gerler Rd, Hendra, Qld 4011, Australia
-
visa fler...
-
- Zhu, You-an (författare)
- Uppsala universitet,Evolution och utvecklingsbiologi,Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Key Lab Vertebrate Evolut & Human Origins, Beijing 100044, Peoples R China
-
- Lu, Jing (författare)
- Australian Natl Univ, Res Sch Phys & Engn, Bldg 60, Canberra, ACT 2601, Australia;Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Key Lab Vertebrate Evolut & Human Origins, Beijing 100044, Peoples R China;CAS Ctr Excellence Life & Paleoenvironm, Beijing 100044, Peoples R China
-
visa färre...
-
(creator_code:org_t)
- ELSEVIER, 2019
- 2019
- Engelska.
-
Ingår i: Palaeoworld. - : ELSEVIER. - 1871-174X .- 1875-5887. ; 28:4, s. 525-534
- Relaterad länk:
-
https://urn.kb.se/re...
-
visa fler...
-
https://doi.org/10.1...
-
visa färre...
Abstract
Ämnesord
Stäng
- Arthodire placoderms, as a possible sister group of Chinese 'maxillate' placoderms plus crown gnathostomes, provide important information regarding early evolution of jaws and teeth. High-resolution computed tomography and digital dissection on a unique articulated 400 million-year-old buchanosteid arthrodire permitsa detailed description of the three types of gnathal elements in basal arthrodires for the first time, giving insights into their morphology and the organization of the associated dentition. In displaying numerous denticle rows (dental fields), the gnathal element morphology is very different from the much-reduced denticulation of higher brachythoracid arthrodires, even though the latter have been used recently to interpret origin and early evolution of teeth. Ossification centres are anterolateral on the anterior supragnathal (attached to the braincase), anteromesial on the posterior supragnathal (attached to the palatoquadrate), and in the central part of the biting portion of the infragnathal (attached to the meckelian cartilage). The latter bone shows no evidence of two ossification centres as has been interpreted for more advanced arthrodires. Denticle rows radiating from the ossification centre form dental fields in all three elements, and are more similar to the gnathal elements of phlyctaeniid and actinolepid arthrodires than to advanced brachythoracids. The new evidence gives insights into the primitive arthrodire condition for comparison with the dermal jaw bones of Chinese 'maxillate' placoderms that have been homologised with the premaxilla, maxilla, and dentary of osteichthyans. The new details will help clarify the sequence of character acquisition in the evolution of marginal jaw bones in basal gnathostome groups.
Ämnesord
- NATURVETENSKAP -- Biologi -- Evolutionsbiologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Evolutionary Biology (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Annan geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Other Earth and Related Environmental Sciences (hsv//eng)
Nyckelord
- Placodermi
- Arthrodire
- Early Devonian
- Gnathal elements
- Evolution
- Morphology
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
Hitta via bibliotek
Till lärosätets databas