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Early ontogeny and soft tissue preservation in siphonotretide brachiopods: New data from the Cambrian-Ordovician of Iran
Department of Geology, National Museum of Wales, Cardiff, United Kingdom.
Department of Geology, National Museum of Wales, Cardiff, United Kingdom.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
Department of Geology, Faculty of Sciences, Golestan University, Gorgan, Iran.
2009 (English)In: Gondwana Research, ISSN 1342-937X, Vol. 16, no 1, 151-161 p.Article in journal (Refereed) Published
Abstract [en]

New Late Cambrian (Furongian) to Early Ordovician (Tremadocian) assemblages of micromorphic organo-phosphatic (linguliformean) brachiopods from Iran are characterised by the presence of exceptionally well preserved material of the Order Siphonotretida, a small, phylogenetically important group with a very poorly documented Cambrian history. Unlike other known Cambrian siphonotretides, which generally lack true spines, the new Iranian taxa preserve the constant presence of hollow spines from as early as the mid Late Cambrian. Early siphonotretide ontogeny remains poorly known, but new data from the Iranian faunas demonstrate that the dorsal larval shell had two pairs of lobes, indicative probably of the presence of larval setal sacs and possibly a rudiment of the embryonic shell. Morphology of the ventral brephic shell. previously unknown in siphonotretides, confirms earlier observations that the adult siphonotretide pedicle attachment was related entirely to the ventral mantle, and it may not be homologous with the pedicle of other lingulates. Phosphatised setae emerging from hollow spines are described for the first time in siphonotretides, most probably representing a retained primitive character. Siphonobolus priscus and Siphonobolus kalshanehensis are established as new species. (C) 2009 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
2009. Vol. 16, no 1, 151-161 p.
Keyword [en]
Brachiopoda, Siphonotretida, Ontogeny, Furongian, Tremadocian, Iran, Soft tissue preservation, Biogeography
National Category
Earth and Related Environmental Sciences
URN: urn:nbn:se:uu:diva-128345DOI: 10.1016/j.gr.2009.01.009ISI: 000268270100013OAI: oai:DiVA.org:uu-128345DiVA: diva2:331322
Available from: 2010-07-22 Created: 2010-07-20 Last updated: 2013-02-06Bibliographically approved

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