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Fossil seeds with affinities to Austrobaileyales andNymphaeales from the Early Cretaceous (early-middle Albian) of Virginia andMaryland, U.S.A: new evidence for extensive extinction near the base of theangiosperm tree
Swedish Museum of Natural History, Department of Paleobiology.
Oak Spring Garden Foundation.
Århus University.
2018 (English)In: Transformative Paleobotany: Papers to Commemorate theLife and Legacy of Thomas N. Taylor / [ed] Krings M, Harper CJ, Cúneo NR, Rothwell GW, London: Academic Press, 2018, p. 417-435Chapter in book (Refereed)
Abstract [en]

Early Cretaceous seeds from Virginia and Maryland, USA, part of a diverse complex of exotestal seeds in Early Cretaceous mesofossil floras from North America and Europe, provide new evidence of extensive extinction among early angiosperms. The seeds are assigned to a new genus, Nitaspermum, with six species: N. taylorii, N. hopewellense, N. crassum, N. virginiense, N. marylandense, and Nitaspermum sp. All seeds are small, anatropous, bitegmic, and exotestal, with the exotesta composed of a single layer of short, columnar sclerenchyma with strongly folded walls. Nitaspermum shows features of extant Austrobaileyales (Illiciaceae) and Nymphaeales but also critical differences precluding assignment to extant families. These discoveries are consistent with predictions from molecular phylogenetics that indicate the differentiation of Illiciaceae and Nymphaeales early in angiosperm evolution, but the diversity of such seeds underlines the extent to which the pattern of extant angiosperm diversity has been shaped by widespread extinction early in angiosperm evolution.

Place, publisher, year, edition, pages
London: Academic Press, 2018. p. 417-435
Keywords [en]
Fossil embryos, Fossil seeds, Illiciaceae, Illiciospermum, Synchrotron radiation X-ray tomographic microscopy (SRXTM)
National Category
Earth and Related Environmental Sciences
Research subject
Ecosystems and species history; Diversity of life
Identifiers
URN: urn:nbn:se:nrm:diva-2883DOI: 10.1016/B978-0-12-813012-4.00017-6ISBN: 978-0-12-813012-4 (print)OAI: oai:DiVA.org:nrm-2883DiVA, id: diva2:1256537
Funder
Swedish Research Council, 2014-5228Available from: 2018-10-17 Created: 2018-10-17 Last updated: 2018-10-23Bibliographically approved

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Publisher's full texthttps://www.sciencedirect.com/science/article/pii/B9780128130124000176

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