Sökning: id:"swepub:oai:DiVA.org:uu-454188" >
The emergence of a ...
The emergence of a complex pore-canal system in the dermal skeleton of Tremataspis (Osteostraci)
-
- Bremer, Oskar, 1985- (författare)
- Uppsala universitet,Evolution och utvecklingsbiologi
-
- Qu, Qingming (författare)
- Univ Ottawa, Dept Biol, Ottawa, ON, Canada; Xiamen Univ, Innovat Ctr Cell Signal Network, State Key Lab Cellular Stress Biol, Sch Life Sci, Xiamen, Peoples R China
-
- Sanchez, Sophie (författare)
- Uppsala universitet,Evolution och utvecklingsbiologi,European Synchrotron Radiat Facil, Grenoble, France
-
visa fler...
-
- Märss, Tiiu (författare)
- Tallinn Univ Technol, Dept Geol, Tallinn, Estonia
-
- Fernandez, Vincent (författare)
- Nat Hist Museum, Imaging & Anal Ctr, London, England
-
- Blom, Henning, 1969- (författare)
- Uppsala universitet,Evolution och utvecklingsbiologi
-
visa färre...
-
(creator_code:org_t)
- 2021-05-04
- 2021
- Engelska.
-
Ingår i: Journal of morphology. - : Wiley. - 0362-2525 .- 1097-4687. ; 282:8, s. 1141-1157
- Relaterad länk:
-
https://doi.org/10.1...
-
visa fler...
-
https://uu.diva-port... (primary) (Raw object)
-
https://onlinelibrar...
-
https://urn.kb.se/re...
-
https://doi.org/10.1...
-
visa färre...
Abstract
Ämnesord
Stäng
- Thyestiids are a group of osteostracans (sister-group to jawed vertebrates) ranging in time from the early Silurian to Middle Devonian. Tremataspis is unique among thyestiids in having a continuous mesodentine and enameloid cover on its dermal elements, and an embedded pore-canal system divided into lower and upper parts by a perforated septum. The origin of this upper mesh canal system and its potential homology to similar canal systems of other osteostracans has remained a matter of debate. To investigate this, we use synchrotron radiation microtomography data of four species of Tremataspis and three other thyestiid genera. Procephalaspis oeselensis lacks an upper mesh canal system entirely, but Aestiaspis viitaensis has partially enclosed upper canals formed between slightly modified tubercles that generally only cover separate pore fields. Further modification of tubercles in Dartmuthia gemmifera forms a more extensive, semi-enclosed upper mesh canal system that overlies an extensive perforated septum, similar to that found in Tremataspis. Lower mesh canals in P. oeselensis are radially arranged and buried tubercles indicate a continuous growth and addition of dermal hard tissues. These features are lacking to varying degrees in the other investigated thyestiids, and Tremataspis probably had a determinate growth accompanied by a single mineralization phase of its dermal hard tissues. The previously proposed homology between the semi-enclosed upper canal system in Dartmuthia to the pore-canal system in Tremataspis is supported in this study, but the suggested homologies between these canals and other parts of the thyestiid vasculature to those in non-thyestiid osteostracans remain unclear. This study shows that three-dimensional modeling of high-resolution data can provide histological and structural details that can help clarify homology issues and elucidate the evolution of dermal hard tissues in osteostracans. In extension, this can give insights into how these tissues relate to those found among jawed vertebrates.
Ämnesord
- MEDICIN OCH HÄLSOVETENSKAP -- Medicinska och farmaceutiska grundvetenskaper -- Cell- och molekylärbiologi (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Basic Medicine -- Cell and Molecular Biology (hsv//eng)
Nyckelord
- 3D histology
- dermal hard tissues
- Thyestiida
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
Hitta via bibliotek
Till lärosätets databas