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The tommotiid Camenella reticulosa from the early Cambrian of South Australia: Morphology, scleritome reconstruction, and phylogeny
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
2009 (English)In: Acta Palaeontologica Polonica, ISSN 0567-7920, E-ISSN 1732-2421, Vol. 54, no 3, 525-540 p.Article in journal (Refereed) Published
Abstract [en]

The tommotiid Camenella reticulosa is redescribed based on new collections of well preserved sclerites from the Arrowie Basin (Flinders Ranges), South Australia, revealing new information concerning morphology and microstructure. The acutely pyramidal mitral sclerite is described for the first time and the sellate sclerite is shown to be coiled through up to 1.5 whorls. Based on Camenella, a model is proposed by which tommotiid sclerites are composed of alternating dense phosphatic, and presumably originally organic-rich, laminae. Camenella is morphologically most similar to Lapworthella, Kennardia, and Dailyatia, and these taxa are interpreted to represent a monophyletic clade, here termed the "camenellans", within the Tommotiida. Potential reconstructions of the scleritome of Camenella are discussed and although a tubular scleritome construction was recently demonstrated for the tommotiids Eccentrotheca and Paterimitra, a bilaterally symmetrical scleritome model with the sclerites arranged symmetrically on the dorsal surface of a vagrant animal can not be ruled out.

Place, publisher, year, edition, pages
2009. Vol. 54, no 3, 525-540 p.
Keyword [en]
Tommotiida, Camenella, scleritome, phylogeny, Atdabanian, Botoman, Cambrian, South Australia
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:uu:diva-127484DOI: 10.4202/app.2008.0082ISI: 000270574400015OAI: oai:DiVA.org:uu-127484DiVA: diva2:330299
Available from: 2010-07-15 Created: 2010-07-13 Last updated: 2017-12-12Bibliographically approved

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