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Microsporangiophores from the Early Cretaceous (Berriasian) of Bornholm, Denmark, with comments on a pre-angiosperm xerophytic flora
Swedish Museum of Natural History, Department of Paleobiology.ORCID iD: 0000-0001-7587-9687
Oak Spring Gardens.ORCID iD: 0000-0003-4331-6948
Aarhus University.ORCID iD: 0000-0003-3038-0967
2021 (English)In: Review of Palaeobotany and Palynology, ISSN 0034-6667, E-ISSN 1879-0615, Vol. 293, article id 104487Article in journal (Refereed) Published
Abstract [en]

A new taxon, Skyttegaardia galtieri, is described based on microsporangiophores with Monosulcites/Cycadopites pollen isolated from clays collected at the Skyttegård locality, island of Bornholm, Denmark, which are of earliest Cretaceous (Berriasian) age. Each microsporangiophore consists of a short, massive proximal fertile stalk-like portion with a truncate base, and a long sterile distal extension. A cavity on each side of the median line of the stalk-like portion, partially encloses a sporangium that dehisces by a longitudinal slit. The long distal extension tapers to a slender point and is curved toward the inferred adaxial side. The extension is irregularly angular in cross-section and the cuticle is thick with deep stomatal pits. The organization of the microsporangiophore, the in situ pollen and stomatal features suggest relationship with extant Cycadales. However, in all extant and fossil cycads there are usually many more sporangia per microsporangiophore, typically in groups of two to five, and they are borne on the surface of the proximal stalk-like portion rather than embedded in its tissues. These differences preclude secure inclusion of Skyttegaardia in Cycadales and open the possibility that these microsporangiophores were produced by a group of extinct plants, the other parts of which remain to be identified. The thick cuticle and sunken stomata of Skyttegaardia, together with the embedded sporangia, suggest adaptation to water stress, which is also consistent with the xeromorphic traits seen among the leaf fragments in the Skyttegaard flora and the arid conditions inferred from geological–geochemical proxies.

Place, publisher, year, edition, pages
Amsterdam: Elsevier, 2021. Vol. 293, article id 104487
Keywords [en]
Paleontology, Ecology, Evolution, Behavior and Systematics, Cycadales, Cycadopites, Monosulcites, Skyttegård Member, SRXTM, Synchrotron radiation x-ray microtomography
National Category
Other Earth and Related Environmental Sciences
Research subject
Ecosystems and species history; The changing Earth
Identifiers
URN: urn:nbn:se:nrm:diva-4476DOI: 10.1016/j.revpalbo.2021.104487OAI: oai:DiVA.org:nrm-4476DiVA, id: diva2:1618409
Funder
Paul Scherrer Institut, PSI, 20110963Paul Scherrer Institut, PSI, 20160140Swedish Research Council, 2014-5228Available from: 2021-12-09 Created: 2021-12-09 Last updated: 2021-12-16Bibliographically approved

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Friis, Else MarieCrane, Peter RobertPedersen, Kaj Raunsgaard
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