The tommotiid Camenella reticulosa from the early cambrian of South Australia: morphology, scleritome reconstruction, and phylogeny

Skovsted, C.B., Balthasar, U., Brock, G.A. and Paterson, J.R. (2009) The tommotiid Camenella reticulosa from the early cambrian of South Australia: morphology, scleritome reconstruction, and phylogeny. Acta Palaeontologica Polonica, 54(3), pp. 525-540. (doi: 10.4202/app.2008.0082)

Abstract

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.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Balthasar, Dr Uwe
• Authors: Skovsted, C.B., Balthasar, U., Brock, G.A., and Paterson, J.R.
• Subjects: Q Science > QE Geology
• College/School: College of Science and Engineering > School of Geographical and Earth Sciences
• Journal Name: Acta Palaeontologica Polonica
• Journal Abbr.: Acta Palaeontol. Pol.
• ISSN: 0567-7920
• ISSN (Online): 1732-2421