Academic literature on the topic 'Pteraspidomorphi'
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Journal articles on the topic "Pteraspidomorphi":
Blieck, Alain, and Peter R. Tarrant. "Protopteraspis Gosseleti (Vertebrata: Pteraspidomorphi: Heterostraci) from the Lower Devonian of Shropshire, England." Palaeontology 44, no. 1 (February 2001): 95–112. http://dx.doi.org/10.1111/1475-4983.00171.
Blieck, Alain R. M., and Valentina N. Karatajūtė-Talimaa. "New corvaspids from the Lochkovian (Lower Devonian) of Severnaya Zemlya, Russia (Vertebrata: Pteraspidomorphi: Heterostraci)." Journal of Vertebrate Paleontology 21, no. 4 (December 14, 2001): 639–50. http://dx.doi.org/10.1671/0272-4634(2001)021[0639:ncftll]2.0.co;2.
Blieck, A., D. K. Elliott, and L. S. Lassiter. "A new species of cyathaspid (Vertebrata: Pteraspidomorphi: Heterostraci) from the Lower Devonian Drake Bay Formation, Prince of Wales Island, Nunavut, Arctic Canada." Estonian Journal of Earth Sciences 67, no. 1 (2018): 88. http://dx.doi.org/10.3176/earth.2018.06.
Sansom, Ivan J., Peter W. Haines, Plamen Andreev, and Robert S. Nicoll. "A new pteraspidomorph from the Nibil Formation (Katian, Late Ordovician) of the Canning Basin, Western Australia." Journal of Vertebrate Paleontology 33, no. 4 (July 2013): 764–69. http://dx.doi.org/10.1080/02724634.2013.751920.
Blieck, Alain, and David K. Elliott. "Pteraspidomorphs (Vertebrata), the Old Red Sandstone, and the special case of the Brecon Beacons National Park, Wales, U.K." Proceedings of the Geologists' Association 128, no. 3 (June 2017): 438–46. http://dx.doi.org/10.1016/j.pgeola.2016.07.003.
Glinskiy, V. N., and D. V. Pinakhina. "New data on psammosteid heterostracans (Pteraspidomorpha) and acanthodians (Acanthodii) from the Pärnu Regional Stage (Lower Eifelian, Middle Devonian) of Estonia." Estonian Journal of Earth Sciences 67, no. 1 (2018): 76. http://dx.doi.org/10.3176/earth.2018.05.
Elliott, David, Linda Lassiter, and Alain Blieck. "A phylogenetic analysis of the Cyathaspididae (Vertebrata: Pteraspidomorphi: Heterostraci)." Acta Palaeontologica Polonica 66 (2021). http://dx.doi.org/10.4202/app.00811.2020.
Houée, Guillaume, Jérémie Bardin, Damien Germain, Philippe Janvier, and Nicolas Goudemand. "Developmental models shed light on the earliest dental tissues, using Astraspis as an example." Palaeontology 66, no. 6 (November 2023). http://dx.doi.org/10.1111/pala.12682.
Dissertations / Theses on the topic "Pteraspidomorphi":
Houée, Guillaume. "Développement et évolution du squelette minéralisé des vertébrés : modélisation histomorphogénétique appliquée aux fossiles de ptéraspidomorphes." Electronic Thesis or Diss., Sorbonne université, 2023. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2023SORUS571.pdf.
The mineralized skeleton is a key structure in vertebrates. Like many other metazoan groups, it serves essential functions, including support, protection, feeding, and various physiological roles. Since its origin, this mineralized skeleton has diversified at multiple scales. Today, it comprises a variety of elements made up of different tissues, with varying composition and structure. To better understand the current distribution of histomorphological properties in the mineralized skeleton of vertebrates, we can examine the origins and evolutionary history of this diversity.The study of the distribution of mineralized tissues in present and past vertebrates has enhanced our understanding of their phylogenetic and temporal origins. One of the oldest known mineralized tissues have been notably found in pteraspidomorphs (stem-gnathostomes; Ordovician-Devonian). Their mineralized dermal skeleton takes the form of two cephalothoracic plates, accompanied by numerous scales covering the rest of their bodies. These structures generally consisted of two bone layers, a compact one and a spongy one, topped with odontodes (extra-buccal teeth) made of dentine, sometimes associated with enameloid (a tissue similar to enamel). Although these elements provide insights into the origins and evolution of tissues in vertebrates, the precise mechanisms of their diversification remain quite enigmatic. The objective of this thesis is to explore, in an integrated manner, the developmental mechanisms that may have favored the emergence of tissues during the evolution of the mineralized skeleton in vertebrates. The first part was dedicated to the revision of concepts related to dental tissues, their method of identification, as well as their current and past distribution. This contributed to clarifying the nomenclature and validity of previous identifications of dental tissues, while also proposing a phylogenetic framework to discuss their key evolutionary stages. The second part focused on constructing a current histogenetic model of dentin, enameloid, and enamel. This allowed for the study of transition mechanisms between tissues by exploring the in silico impact of developmental parameters on the formation of dental tissues. Various developmental modifications leading to the transition between enameloid and enamel were thus identified, suggesting that the establishment of new tissues does not necessarily require the acquisition of new genes. The third part, adding a morphogenetic dimension to the previous histogenetic model, focused on the formation of dental structures composed of dentin, enameloid, and enamel. The in silico exploration of the impact of the initial curvature of the epithelium and the spatiotemporal activation timing of cells revealed that modifying such intercellular parameters influenced the presence and distribution of tissues within a structure. The fourth part, revising the paleohistology of Astraspis, aimed to reconstruct the ontogeny of one of the earliest 'dental' structures. In addition to strengthening the identification of the covering tissue as enameloid, it allowed for a comparison of the developmental mechanisms of these early structures with those of contemporary ones. A major difference was that the odontodes of stem-gnathostomes appeared to form through synchronous, rather than delayed, activation of mesenchymal cells. The fifth part delved into the histomorphogenesis of the 'fingerprint' and 'honeycomb' structures found in Anglaspis. This facilitated a discussion of structuring mechanisms, such as reaction-diffusion processes, that could have influenced the formation of the skeletons in early vertebrates
Book chapters on the topic "Pteraspidomorphi":
Smith, Margaret M., and Phillip C. Heemstra. "Class Pteraspidomorphi." In Smiths’ Sea Fishes, 33–37. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82858-4_11.