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New data on the anatomy and systematic affinities of corystosperm wood from the Triassic of Antarctica
Swedish Museum of Natural History, Department of Paleobiology.ORCID iD: 0000-0002-2186-4970
2014 (English)In: Review of Palaeobotany and Palynology, ISSN 0034-6667, E-ISSN 1879-0615, Vol. 203, no 1, 22-34 p.Article in journal (Refereed) Published
Abstract [en]

Anatomically preserved trunks and young stems of corystosperm seed ferns are described from the Triassic of Fremouw Peak, Beardmore Glacier area, Antarctica. Based on characters of the primary and secondary vascular system, these new specimens are assigned to Kykloxylon, a genus that was established based on young stems with attached Dicroidium leaf bases. The largest specimens illustrate how some secondary growth characters, such as unequal cambial activity, appeared during later development, which enables a better comparison of Kykloxylon with trunks assigned to other corystosperm genera. Jeffersonioxylon from the Gordon Valley, Antarctica, and Cuneumxylon from South America show strong similarities with the newly described larger Kykloxylon trunks from Fremouw Peak, and might be considered congeneric. Our results provide further support for the presence of two anatomically and morphologically distinct kinds of Dicroidium-bearing trees in the Triassic vegetation of Gondwana, one with a palm-like habit and Rhexoxylon stems and the other with a more Ginkgo-like habit and Kykloxylon/Cuneumxylon-type stems

Place, publisher, year, edition, pages
Elsevier, 2014. Vol. 203, no 1, 22-34 p.
National Category
Other Earth and Related Environmental Sciences
Research subject
The changing Earth
Identifiers
URN: urn:nbn:se:nrm:diva-978OAI: oai:DiVA.org:nrm-978DiVA: diva2:769652
Available from: 2014-12-08 Created: 2014-12-08 Last updated: 2014-12-08Bibliographically approved

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