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A Crown-Group Demosponge from the Early Cambrian Sirius Passet Biota, North Greenland
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Pharmacy, Department of Medicinal Chemistry, Division of Pharmacognosy. Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Systematic Biology.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
2015 (English)In: Palaeontology, ISSN 0031-0239, E-ISSN 1475-4983, Vol. 58, no 1, 35-43 p.Article in journal (Refereed) Published
Abstract [en]

Calibration of the divergence times of sponge lineages and understanding of their phylogenetic history are hampered by the difficulty in recognizing crown versus stem groups in the fossil record. A new specimen from the lower Cambrian (Series 2, Stage 3; approximately 515Ma) Sirius Passet Biota of North Greenland has yielded a diagnostic spicule assemblage of the extant demosponge lineages Haploscleromorpha and/or Heteroscleromorpha. The specimen has disarticulated approximately in situ, but represents an individual sponge that possessed monaxon spicules combined with a range of slightly smaller sigma, toxa and unique spiral morphologies. The combination of spicule forms, together with their relatively large size, suggests that the sponge represents the stem lineage of Haploscleromorpha+Heteroscleromorpha. This is the first crown-group demosponge described from the early Cambrian and provides the most reliable calibration point currently available for phylogenetic studies.

Place, publisher, year, edition, pages
2015. Vol. 58, no 1, 35-43 p.
Keyword [en]
Porifera, sponge, Demospongiae, molecular clocks
National Category
Other Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:uu:diva-244503DOI: 10.1111/pala.12133ISI: 000347542300004OAI: oai:DiVA.org:uu-244503DiVA: diva2:789395
Available from: 2015-02-18 Created: 2015-02-17 Last updated: 2017-12-04Bibliographically approved

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Botting, Joseph P.Cardenas, PacoPeel, John S.

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