The osteoderm microstructure in doswelliids and proterochampsids and its implications for palaeobiology of stem archosaurs
| Autor: | Julia Brenda Desojo, Sterling J. Nesbitt, Ignacio Alejandro Cerda, Denis Alejandro Ponce |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
010506 paleontology Proterochampsidae Histology microanatomy Protero Champ Sidae 010603 evolutionary biology 01 natural sciences Doswelliidae Ciencias de la Tierra y relacionadas con el Medio Ambiente histology purl.org/becyt/ford/1 [https] lcsh:GN282-286.7 purl.org/becyt/ford/1.5 [https] Ciencias Exactas y Naturales (General) lcsh:Fossil man. Human paleontology Osteoderm lcsh:QE701-760 USA 0105 earth and related environmental sciences Archosauria biology Paleontology Palaeoecology Anatomy palaeoecology biology.organism_classification Triassic Microanatomy lcsh:Paleontology Meteorología y Ciencias Atmosféricas Geology CIENCIAS NATURALES Y EXACTAS |
| Zdroj: | CONICET Digital (CONICET) Consejo Nacional de Investigaciones Científicas y Técnicas instacron:CONICET RID-UNRN (UNRN) Universidad Nacional de Río Negro instacron:UNRN Acta Palaeontologica Polonica, Vol 62, Iss 4, Pp 819-831 (2017) |
| Popis: | Fil: Ponce, Denis A. Universidad Nacional de Río Negro; Argentina Fil: Ponce, Denis A. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Cerda, Ignacio A. Universidad Nacional de Río Negro; Argentina Fil: Desojo, Julia B. División Paleontología Vertebrados, Museo de La Plata, Universidad Nacional de La Plata; Argentina Fil: Cerda, Ignacio A. Instituto de Investigación en Paleobiología y Geología; Argentina Fil: Nesbitt, Sterling J. Department of Geosciences, Virginia Tech; Estados Unidos Osteoderms are common in most archosauriform lineages, including basal forms, such as doswelliids and proterochampsids. In this survey, osteoderms of the doswelliids Doswellia kaltenbachi and Vancleavea campi, and proterochampsid Chanaresuchus bonapartei are examined to infer their palaeobiology, such as histogenesis, age estimation at death, development of external sculpturing, and palaeoecology. Doswelliid osteoderms have a trilaminar structure: two cortices of compact bone (external and basal) that enclose an internal core of cancellous bone. In contrast, Chanaresuchus bonapartei osteoderms are composed of entirely compact bone. The external ornamentation of Doswellia kaltenbachi is primarily formed and maintained by preferential bone growth. Conversely, a complex pattern of resorption and redeposition process is inferred in Archeopelta arborensis and Tarjadia ruthae. Vancleavea campi exhibits the highest degree of variation among doswelliids in its histogenesis (metaplasia), density and arrangement of vascularization and lack of sculpturing. The relatively high degree of compactness in the osteoderms of all the examined taxa is congruent with an aquatic or semi-aquatic lifestyle. In general, the osteoderm histology of doswelliids more closely resembles that of phytosaurs and pseudosuchians than that of proterochampsids. |
| Databáze: | OpenAIRE |
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