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A spinose stem group brachiopod with pedicle from the Middle Cambrian Burgess Shale
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
Department of Natural History, Royal Ontario Museum, Toronto, Ontario, Canada .
2006 (English)In: Acta Zoologica (Stockholm), ISSN 0001-7272, E-ISSN 1463-6395, Vol. 87, no 4, 273-290 p.Article in journal (Refereed) Published
Abstract [en]

A new genus and species of a Middle Cambrian stem group brachiopod, Acanthotretella spinosa n. gen. and n. sp., is described from the Burgess Shale Formation. Most of the 42 specimens studied came from the Greater Phyllopod bed (Walcott Quarry) and were collected from five bed assemblages, each representing a single obrution event. Specimens are probably preserved within their original habitat. In contrast to all brachiopods known from the Burgess Shale, the shells of the new stem group brachiopod are often deformed and do not show signs of brittle breakage, which suggests that the valves were originally either entirely organic in composition or, more likely, had just a minor mineral component. Acanthotretella spinosa differs from all the other described Cambrian brachiopods in that it is covered by long, slender and possibly partly mineralized spines that are posteriorly inclined at an oblique angle away from the anterior margin. The spines penetrate the shell and are mainly comparable with the thorn-like organic objects that have been inferred from early siphonotretoid brachiopods. The pedicle was slender and was composed of a central coelomic region and emerged from an apical foramen at the end of an internal pedicle tube. The finding of a pedicle attached to the macrobenthic algae Dictyophycus and other epibenthos implies that A. spinosa did not have an infaunal mode of life. The visceral region and interior characters are poorly preserved.

Place, publisher, year, edition, pages
2006. Vol. 87, no 4, 273-290 p.
Keyword [en]
epibenthos, filter-feeder, fossil Lagerstatten, lophophorate, non-biomineralized preservation, siphonotretoid
National Category
Earth and Related Environmental Sciences
URN: urn:nbn:se:uu:diva-83856DOI: 10.1111/j.1463-6395.2006.00241.xISI: 000240625600005OAI: oai:DiVA.org:uu-83856DiVA: diva2:111764
Available from: 2006-11-10 Created: 2006-11-10 Last updated: 2013-04-08Bibliographically approved

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Holmer, Lars Erik
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