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Laveine J.-P.,Musee de Geologie de la Ville de Lille | Dufour F.,rue Ampere
Palaeontographica Abteilung B: Palaeophytologie | Year: 2013

A remarkable bifurcate frond fragment of Neurodontopteris auriculata, from the Late Pennsylvanian (Late Stephanian) of the Blanzy- Montceau Basin (Massif Central, France) is described. Together with Brongniart's 1830 type specimen and two specimens from the Lille collections, it completes the information concerning both the foliage characteristics and the general bifurcate "outer-inner" semi-pinnate frond organization of the genus Neurodontopteris. Reconstruction of the frond is proposed. Frond morphology suggests that Neurodontopteris auriculata is a member of the seed plant order Medullosales. The generic diagnosis for Neurodontopteris Potonie 1893 is emended. Comparisons of the morphological characteristics of the Neurodontopteris frond with those of the Neuropteris, Macroneuropteris and Mixoneura fronds, respectively, sustain a close relationship between Neurodontopteris and Mixoneura. Taxonomical and nomenclatural implications are discussed. Among various macromorphological features such as oblique insertion of the pinnules on the rachides, N. auriculata appears as one of the Medullosales with the greatest leaf vein density; possible related palaeoecological inferences are briefly analyzed.©2013 E. Schweizerbartsche Verlagsbuchhandlung, Stuttgart, Germany.

Laveine J.-P.,Musee de Geologie de la Ville de Lille | Oudoire T.,Musee de Geologie de la Ville de Lille
Review of Palaeobotany and Palynology | Year: 2015

Macroneuropteris scheuchzeri is a long-known taxon which, in recent years, has been the subject of renewed attention from various viewpoints. Particularly noticeable among the diverse characters used for the recognition of the species is the presence of 'bristle-like hairs', usually one to 3. mm long, apparently mainly located on the abaxial side of the pinnules. The "hair-status" of these elements was very recently challenged and refuted on the basis of results from the application of new techniques. Recently, dynamic molecular self-assembly was proposed for explaining the origin and emergent nature of these 'extracuticular deposits'. However, based on these and our own observations we conclude that the elements routinely considered to be hairs for the past century and a half in the diagnostic circumscription of the taxon are neither hairs, nor outer emergent deposits. They represent the content of short secretory canals, very likely resin canals, principally located in the lower layer of the mesophyll. This is a good example showing that 'old' and 'new' techniques are complementary. © 2015 Elsevier B.V.

Laveine J.-P.,Musee de Geologie de la Ville de Lille | Delbecque S.,Musee de Geologie de la Ville de Lille
Palaeontographica Abteilung B: Palaeophytologie | Year: 2011

Analysis of large frond fragments oiBarthelopterisgermarii, from the Late Pennsylvanian (Stephanian) of the Blanzy-Montceau Basin (Massif Central, France), shows that the frond is of the bifurcate "outer" semi-pinnate type. Frond reconstructions of this species are proposed. A few preliminary comments on the various morphological characteristics of the fronds within the Neuropterids and the Odontopterids are presented. © 2011 E. Schweizerbart'sche Verlagsbuchhandlung, Stuttgart, Germany.

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