Pteridospermas del Triásico-Jurásico de Australia: especiación, diversidad y declive

Pattemore, G. A., Rigby, J. F. and Playford, G. (2015) Pteridospermas del Triásico-Jurásico de Australia: especiación, diversidad y declive. Boletin Geologico y Minero, 126 4: 689-722.

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Author Pattemore, G. A.
Rigby, J. F.
Playford, G.
Title Pteridospermas del Triásico-Jurásico de Australia: especiación, diversidad y declive
Translated title Triassic-jurassic pteridosperms of australasia: Speciation, diversity and decline
Language of Title spa
Journal name Boletin Geologico y Minero
Language of Journal Name spa
ISSN 0366-0176
Publication date 2015-10-01
Sub-type Article (original research)
Open Access Status Not Open Access
Volume 126
Issue 4
Start page 689
End page 722
Total pages 227
Place of publication Madrid, Spain
Publisher Instituto Geologico y Minero de Espana
Language spa
Subject 1907 Geology
1906 Geochemistry and Petrology
Abstract Pteridosperms are preserved abundantly in the Gondwanan Triassic, with many species exhibiting considerable morphological variation that has been attributed to a hybridization model of speciation. This is an improbable explanation given that hybridization is very rare in gymnosperms. Allopatric speciation resulting from geographic and climatic provincialism is a more likely explanation for the morphological diversity which is well represented in Anisian–Norian (Middle and Upper Triassic) floras of Australasia and elsewhere in Gondwana. Most specimens are distributed among three families: Umkomasiaceae, Peltaspermaceae and Matatiellaceae. These families, together with other possibly pteridospermous genera, are reviewed herein. Diversity in these families apparently declined by the Rhaetian and they did not persist into the Gondwanan post-Triassic. Australasian post-Triassic strata contain remarkably different floral assemblages to those of the Triassic. No fructifications are clearly pteridospermous and no remains show any obvious relationship with pteridosperms of the Gondwanan Triassic. Caytonialean fructifications are not known in Australasian strata; however, associated foliage has been reported from the Eastern Gondwanan Upper Triassic through Middle Jurassic including Australia. Much fern-like foliage, claimed to be pteridospermous from the Lower Jurassic through Eocene of Eastern Gondwana, lacks supporting evidence of such affiliation.
Keyword Australasia
Q-Index Code CX
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Non HERDC
School of Earth Sciences Papers
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