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A sclerite-bearing stem group entoproct from the early Cambrian and its implications
Northwest University, Xian, China.
Uppsala Universitet.
Swedish Museum of Natural History, Department of Paleobiology.ORCID iD: 0000-0001-7366-7680
Macquarie University, Sydney, Australia.
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2013 (English)In: Scientific Reports, ISSN 2045-2322, Vol. 3, no 1066, 1-7 p.Article in journal (Refereed) Published
Abstract [en]

The Lophotrochozoa includes disparate tentacle-bearing sessile protostome animals, which apparently appeared in the Cambrian explosion, but lack an uncontested fossil record. Here we describe abundant well preserved material of Cotyledion tylodes Luo et Hu, 1999, from the Cambrian (Series 2) Chengjiang deposits, reinterpreted here as a stem-group entoproct. The entoproct affinity is supported by the sessile body plan and interior soft anatomy. The body consists of an upper calyx and a lower elongate stalk with a distal holdfast. The soft anatomy includes a U-shaped gut with a mouth and aboral anus ringed by retractable marginal tentacles. Cotyledion differs from extant entoprocts in being larger, and having the calyx and the stalk covered by numerous loosely-spaced external sclerites. The description of entoprocts from the Chengjiang biota traces the ancestry of yet another lophotrochozoan phylum back to the Cambrian radiation, and has important implications for the earliest evolution of lophotrochozoans.

Place, publisher, year, edition, pages
2013. Vol. 3, no 1066, 1-7 p.
Keyword [en]
Phylogenetics, Origin of life, Palaeoecology, Palaeontology
National Category
Geology
Research subject
The changing Earth; Ecosystems and species history
Identifiers
URN: urn:nbn:se:nrm:diva-870DOI: 10.1038/srep01066OAI: oai:DiVA.org:nrm-870DiVA: diva2:764656
Projects
Origin and early evolution of major animal clades in the Cambrian Period
Available from: 2014-11-20 Created: 2014-11-20 Last updated: 2014-11-20

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Publisher's full texthttp://www.nature.com/srep/2013/130117/srep01066/full/srep01066.html

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CiteExportLink to record
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Citation style
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More styles
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