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Article: The tommotiid Kelanella and associated fauna from the early Cambrian of southern Montagne Noire (France): implications for camenellan phylogeny

Publication: Palaeontology
Volume: 57
Part: 5
Publication Date: September 2014
Page(s): 979 1002
Author(s): <p>Léa Devaere, Sébastien Clausen, Eric Monceret, Daniel Vizcaïno, Daniel Vachard and Marie C. Genge</p>
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How to Cite

DEVAERE, L., CLAUSEN, S., MONCERET, E., VIZCAÏNO, D., VACHARD, D. and GENGE, M.C. 2014. The tommotiid Kelanella and associated fauna from the early Cambrian of southern Montagne Noire (France): implications for camenellan phylogeny. Palaeontology57, 5, 979–1002. doi: 10.1111/pala.12098

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Publication History

  • Issue published online: 12 SEP 2014
  • Article first published online: 24 FEB 2014
  • Manuscript Accepted: 23 DEC 2013
  • Manuscript Received: 20 SEP 2013

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University Lille 1
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Wiley Online Library
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A carbonate bed of the Pardailhan Formation, early Cambrian, southern Montagne Noire (southern France), provided microfossils such as Hyolithellus sp., Torellella cf. mutila and Torellella sp. along with numerous disarticulated pieces of composite skeletons such as valves of the brachiopod Eoobolus priscus and of the bradoriid Monceretia erisylvia, and chancelloriid sclerites (Chancelloria sp.). The assemblage also furnished a rich set of sclerites from the tommotiid Kelanella altaica. Five morphological variations of the latter have been identified. The presence of concentric ribs formed by distal inflation of selected shell laminae in Kelanella supports its assignment to the camenellans. More particularly, the presence of transverse structures within the internal cavity (septa) of Kelanella suggests a close relationship with the Lapworthellidae. However, the latter differ from Kelanella by the continuous morphological variation along their scleritome which is also composed of simple conical elements with uniform ornamentation. Several forms of Kelanella are similar to mitral and sellate sclerites of Camenella, whereas some other forms are comparable to Kennardia. The new material suggests that Kelanella occupies a transitional position between Lapworthellidae and the grouping of Tommotiidae and Kennardiidae. Such a phylogenetic position also implies that the number of sclerite morphotypes tends to decrease within the camenellan scleritome during evolution.

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