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Extinct seed plant diversity in the Early Cretaceous: An enigmatic new microsporangiate fossil with Decussosporites pollen in situ
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
2022 (English)In: Review of Palaeobotany and Palynology, ISSN 0034-6667, E-ISSN 1879-0615, Vol. 304, p. 104716-104716, article id 104716Article in journal (Refereed) Published
Abstract [en]

A new microsporangiate cone, Renbernia zhoui, is described from the mesofossil flora extracted from exposures ofthe Potomac Group at Puddledock, Virginia, U.S.A., which are of Early Cretaceous (early-middle Albian) age. The cone consists of densely arranged dorsiventrally flattened laminar, flabelliform microsporangiophores that bear two elongate microsporangia on the presumed abaxial surface. The microsporangia are separated by sterile tissue that expands apically into a prominent hood-like sterile extension. The microsporangia have extrorse valvate dehiscence and both microsporangia and sterile apical expansion are covered by a short stiff hairs. In situ pollen resembles Decussosporites, elliptical with a long median colpus on the presumed distal surface flanked laterally by two equally long lateral colpi. A short transverse colpus on the presumed proximal surface links the two lateral colpi and divides the grain into two parts creating the appearance of two sacci. Renbernia zhoui is similar to Brenneria potomacensis described from the slightly older Drewry's Bluff and Dutch Gap mesofossil floras from the Potomac Group that also has Decussosporites-type pollen in situ. However, Renbernia microsporangiophores are more distinctly laminar and have sporangia that are more prominently elongated and with a hood-like apical extension of sterile tissue. The in situ pollen is also much smaller, the pollen wall is much more distinctly perforate-foveolate rather than more or less psilate, and in Renbernia the saccus-like structures are not inflated. The relationship of Brenneria and Renbernia, as well as the possible link between Decussosporites-type pollen and pollen of Eucommiidites (Erdtmanithecales) is discussed.

Place, publisher, year, edition, pages
Amsterdam: Elsevier, 2022. Vol. 304, p. 104716-104716, article id 104716
Keywords [en]
Brenneria, Erdtmanithecales, Podocarpaceae, SRXTM Synchrotron radiation, x-ray microtomography
National Category
Biological Systematics Other Earth and Related Environmental Sciences
Research subject
Ecosystems and species history; The changing Earth
Identifiers
URN: urn:nbn:se:nrm:diva-4977DOI: 10.1016/j.revpalbo.2022.104716OAI: oai:DiVA.org:nrm-4977DiVA, id: diva2:1717482
Funder
Paul Scherrer Institut, PSI, 20190071Swedish Research Council, 2014-5228
Note

We thank the Paul Scherrer Institut, Villigen, Switzerland, for provisionof synchrotron radiation beamtime at the TOMCAT beamlineX02DA of the Swiss Light Source and Federica Marone for her helpat the beamline. Financial support was provided by the Swiss LightSource (project 20190071) and by the Swedish Research Council (Vetenskapsrådet 2014-5228 to E. M. Friis). We also thank the Oak Spring Garden Foundation for support during the preparation of this paper.

Available from: 2022-12-08 Created: 2022-12-08

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Publisher's full texthttps://reader.elsevier.com/reader/sd/pii/S0034666722001142?token=03D55B672EEB53496E13A7C6649DB277517E123E3D48A471CBA77FD0C121394FC8068620D98D355FE15CE1651377FF02&originRegion=eu-west-1&originCreation=20221208135033

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