Kvacekispermum rugosum E.M.Friis, P.R.Crane et K.R.Pedersen
Plant Fossil Names Registry Number: PFN000107
Act LSID: urn:lsid:plantfossilnames.org:act:107
Genus: Kvacekispermum E.M.Friis, P.R.Crane et K.R.Pedersen
Reference: Friis, E. M., Crane, P. R. & Pedersen, K. R. (2018): Rightcania and Kvacekispermum: Early Cretaceous seeds from eastern North America and Portugal provide further evidence of the early chloranthoid diversification. – Fossil Imprint 74(1–2): 65–76.
Page of description: 72
Illustrations or figures: text-figs 3, 4
Name is type taxon for
Holotype S174951, Palaeobotanical Collections, Department of Palaeobiology, the Swedish Museum of Natural History, Stockholm, Sweden
Figures: text-figs 3a–f, 4a–f
Seeds broadly obovate in lateral view and almost circular in transverse section with coarsely rugulate to reticulate surface formed from the uneven outer surface of endotesta in which the depressions are arranged in poorly defined grooves. Stigmatic area sessile on the fruit apex, slightly raised, hemispherical. Ovule pendent, orthotropous, bitegmic, endotestal. Endotesta comprised of a single layer of palisade-shaped cells with densely spaced crystals and fibrous infillings. Tegmen crushed in mature seeds. Embryo tiny; nutritive tissue of isodiametric thin-walled cells.
The specific epithet is from Latin rugosus: wrinkled.
Cretaceous, Lower Cretaceous
late Aptian – early Albian
Type horizon: basal part of the Figueira da Foz Formation
Vale de Água (39° 37′ 15″ N, 08° 51′ 30″ W)
Plant fossil remain
macro- and meso-fossils-embryophytes except wood