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Geological Magazine; May 2005; v. 142; no. 3; p. 241-253; DOI: 10.1017/S001675680500049X
© 2005 Cambridge University Press (CUP)
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Morphometric analysis of proposed evolutionary lineages of Early Devonian land plant spores

PIERRE BREUER*, LUDOVIC STRICANNE{dagger},{ddagger} and PHILIPPE STEEMANS*,§

* Paléobotanique, Paléopalynologie et Micropaléontologie (PPM), Université de Lège, Sart-Tilman, B-4000 Liège, Belgium
{dagger} Laboratoire de Paléontologie et Paléogeographie du Paléozoïque (LP3), UMR 8014 et FR 1818 du C.N.R.S., Université des Sciences et Technologies de Lille: Sciences de la Terre, F-59655 Villeneuve d’Ascq Cedex, France
{ddagger} Institut für Geowissenschaften, Sigwartrasse 10, D-72076 Tübingen, Germany

§ Author for correspondence: p.steemans{at}ulg.ac.

Early Devonian miospore assemblages from ‘La Gileppe’ (Eastern Belgium) include five varieties of trilete spore belonging to the genus Emphanisporites. These five varieties show a continuous variation of their morphological characteristics. The variation in morphological characteristics can be related to the evolution of morphological features and allows us to define the Emphanisporites micrornatus Morphon. A statistical evaluation of this population highlights the interdependence of almost all morphological parameters. This study proves the increase in size of ornamental and structural parameters over several million years. The biometric changes and the progressive replacement of older morphotypes by younger ones indicate that a temporal link exists between these different varieties. Two phylogenetic hypotheses for the E. micrornatus Morphon are proposed. This morphological evolution is so far observed only on the Eastern Old Red Sandstone Continent and defines a palaeophytogeographic sinuosus–zavallatus Province.

Key Words: Early Devonian • miospore • statistical analysis • phylogeny






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