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Geminispermum, an Early Cretaceous (early–middle Albian) cupulate unit from the angiosperm-dominated Puddledock flora of eastern North America
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
2019 (English)In: Acta Palaeobotanica, ISSN 0001-6594, E-ISSN 1427-6402, Vol. 59, p. 229-239Article in journal (Refereed) Published
Abstract [en]

A new genus and species, Geminispermum virginiense, is described based on a well-preserved coalified cupulate reproductive unit recovered from the Early Cretaceous (early–middle Albian) Puddledock locality, Virginia, U.S.A. The reproductive unit is bisymmetrical and consists of an axis that bifurcates into two cupule-bearing stalks, each in the axil of a bract. Each cupule stalk bears a single non-valvate cupule recurved towards the center of the reproductive unit. The cupule opens distally by a short transverse slit with a distinct upper margin. Each cupule almost completely encloses a single orthotropous seed that is free from the cupule except at the base. The nucellus is also free from the integument except at the basal point of attachment. Geminispermum combines features of the ovulate structures of Caytoniales, Umkomasiales (= Corystospermales, including Doyleales) and Petriellales, but cannot be included in any of these existing orders as they are currently understood. The recurved, closed, non-valvate cupules are particularly similar to those of Caytonia, Petriellaea and Reymanownaea in external morphology, but differ in being one-seeded. The cupules of Geminispermum differ from the one-seeded cupules of Umkomasiales in being non-valvate and in having only a single cupule per bract. Geminispermum is perhaps most similar to the one- or two-seeded non-valvate cupules of Ktalenia from the Early Cretaceous of Argentina, but Ktalenia is poorly preserved, details of cupule architecture are uncertain, and the cupules appear to be associated with a single strongly dissected bract. Geminispermum is currently the only unequivocal seed plant cupule recovered from the Early Cretaceous Potomac Group and is distinct from all previously described cupulate reproductive structures.

Place, publisher, year, edition, pages
Warsaw, 2019. Vol. 59, p. 229-239
Keywords [en]
Caytoniales, Corystospermales, Doyleales, Petriellales, seed ferns, synchrotron radiation X-ray tomographic
National Category
Natural Sciences
Research subject
Ecosystems and species history
Identifiers
URN: urn:nbn:se:nrm:diva-3691DOI: 10.2478/acpa-2019-0020OAI: oai:DiVA.org:nrm-3691DiVA, id: diva2:1381874
Funder
Swedish Research Council, 2014-5228Available from: 2019-12-29 Created: 2019-12-29 Last updated: 2020-01-08Bibliographically approved

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Friis, Else MarieCrane, Peter RobertPedersen, Kaj Raunsgaard
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