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Becklesia maulnyi sp. nov.: A new cycadean species from the Lower Oxfordian (Upper Jurassic) of Écommoy (Sarthe, NW France)

Mathieu Le Couls 1 Jason Hilton 2 François Guillocheau 1 Nicolas Morel 3 Philippe Courville 1
1 GR - Géosciences Rennes
2 School of Geography, Earth and Environmental Sciences, University of Birmingham
3 Musée Vert
Abstract : Plant macrofossil remains of Becklesia Seward 1895 emend. Watson and Cusack 2005, a rare genus of extinct cycad, have been known for over a century from Great Britain and Libya. Historically the genus was poorly characterised leading to many fossil cycads that resembled Becklesia being placed in other genera including Cycadites and Paracycas. We describe here a new species, B. maulnyi sp. nov., from an exceptional and almost complete cycad specimen housed for two hundred years in the collections of the Musée Vert of Le Mans. The specimen comprises the apex of a stem bearing petiolate and pinnate leaves with thin and widely separated leaflets, which possess two prominent abaxial stomatal grooves that are characteristic of the genus Becklesia. We reassign three other French cycad fossils previously described under different generic names to Becklesia. Finally, we briefly discuss the geographical and stratigraphical implications of the ge
Keywords : Cycads Becklesia Oxfordian Upper Jurassic Sarthe NW France
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Conference papers
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https://hal-insu.archives-ouvertes.fr/insu-01388480
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Submitted on : Thursday, October 27, 2016 - 10:17:14 AM
Last modification on : Friday, April 5, 2019 - 8:17:50 PM

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  • HAL Id : insu-01388480, version 1

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Mathieu Le Couls, Jason Hilton, François Guillocheau, Nicolas Morel, Philippe Courville. Becklesia maulnyi sp. nov.: A new cycadean species from the Lower Oxfordian (Upper Jurassic) of Écommoy (Sarthe, NW France). 25 ème Réunion des sciences de la Terre (RST 2016), Société Géologique de France, Oct 2016, Caen, France. pp.192. ⟨insu-01388480⟩

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