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Study of the Taxonomy and theInter and Intra Specific Variabilityof Phacopidae from the Lower Devonian of Algeria: Morphometric Approach and Meaning.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
2015 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

An Algerian Phacopid fauna, described by Lemaître in 1952, is reexamined here. Species arereevaluated in order to be in agreement with modern taxonomy. To characterize the size and shape of our specimens, as well as inter- and intraspecific variations, a morphometric analysis was performed. Only holaspids were analyzed. Results of our analysis show that genera can be be well differentiated thanks to quantitative methods. However, at a specific level, only Austerops lemaitrii nov. sp. is well- defined. Other species can be defined, however, thanks to quantitative methods. Shape variations during growth were also defined in order to understand the evolution of our specimens. Three species show a correlation between shape and size variations for cephala, and two species for the pygidia, which show an ontogenic control of the shape. A covariate analysis was made between the shape of the cephala and the shape of the pygidia, and all of the specimens analyzed show a covariance betweencephalic and pygidial shape.

Abstract [sv]

Trilobiter utgjorde en viktig del av faunun under paleozoikum. I denna artikel studeras ochomprövas en trilobitpopulation från Algeriets devon. För att bättre förstå populationstillväxt och evolution görs analyser av storlek (biometrisk analys) och form (morfometrisk analys). Resultaten visar att de olika släktena är väldefinierade och att tillväxten av somliga arter påverkar formen.Analysen visar också på en samvariation mellan cephalons och pygidiums form.

Place, publisher, year, edition, pages
2015. , 52 p.
Examensarbete vid Institutionen för geovetenskaper, ISSN 1650-6553 ; 307
Keyword [en]
Paleontology, Trilobite, Devonian, Biometry, Morphometry, Covariance
National Category
Other Earth and Related Environmental Sciences
URN: urn:nbn:se:uu:diva-254203OAI: oai:DiVA.org:uu-254203DiVA: diva2:817549
Educational program
Master Programme in Earth Science
Available from: 2015-06-05 Created: 2015-06-05 Last updated: 2015-06-05Bibliographically approved

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Hainaut MSc Thesis 2015(8220 kB)267 downloads
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