Ecpagloxylon mathiesenii gen. nov et sp nov., a Jurassic wood from Greenland with several primitive angiosperm features

• Published in: Plant Systematics and Evolution
• Main Authors: Philippe, Marc, Cuny, Gilles, Bashforth, Arden
• Other Authors: PaleoEnvironnements et PaleobioSphere (PEPS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Geological Museum Copenhagen, Natural History Museum of Denmark, Faculty of Science Copenhagen, University of Copenhagen = Københavns Universitet (UCPH)-University of Copenhagen = Københavns Universitet (UCPH)-Faculty of Science Copenhagen, University of Copenhagen = Københavns Universitet (UCPH)-University of Copenhagen = Københavns Universitet (UCPH), Department of Earth Sciences Halifax, Dalhousie University Halifax, Natural Sciences and Engineering Research Council of Canada, Dalhousie University, Carlsberg Foundation : 1927, DK-TAF-2290
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2010
• Subjects: Fossil wood; Plant anatomy; Jurassic; Angiosperms; Evolution; [SDU.STU]Sciences of the Universe [physics]/Earth Sciences; Arctic; Greenland; Jameson Land
• Online Access: https://insu.hal.science/insu-00672112; https://doi.org/10.1007/s00606-010-0308-z

International audience Fossil wood specimens from the late Early-early Middle Jurassic of Jameson Land, Eastern Greenland, have several unexpected features: tracheids of irregular size and shape, thinly pitted ray cell walls, heterogeneous rays, partially scalariform radial pitting, both areolate and simple pits, and pitted elements associated with rays. These characters diverge markedly from those typical of Jurassic wood, which usually conform to those of modern conifers. Although this combination of features is not encountered in any extant angiosperm, each has been documented in one or several extant homoxylous angiosperms, particularly Amborella, Trochodendron, and Tetracentron. As these wood specimens are not found in connection with any reproductive part, it is impossible to confidently assign them to the angiosperms. If a Jurassic angiosperm did exist, however, it might well have had a similar wood. This material is an early bench-mark in the evolution that led from homoxylous conifer-like wood to that of the angiosperms. Its particular biogeography (Arctic) could renew the discussion about the area of origin of the angiosperms