Riaselis rugosa E.M.Friis, P.R.Crane et K.R.Pedersen
Plant Fossil Names Registry Number: PFN000135
Act LSID: urn:lsid:plantfossilnames.org:act:135
Genus: Riaselis E.M.Friis, P.R.Crane et K.R.Pedersen
Reference: Friis, E. M., Crane, P. R. & Pedersen, K. R. (2019): Extinct Diversity among Early Cretaceous Angiosperms: Mesofossil Evidence of Early Magnoliales from Portugal. – International Journal of Plant Sciences 180(2): 93–127.
Page of description: 113
Illustrations or figures: figs 21, 22
Name is type taxon for
Holotype S174029 (Famalicão 25), Palaeobotanical Collections, Department of Palaeobiology, the Swedish Museum of Natural History, Stockholm, Sweden
Figures: figs 21A–E, 22A–C
Note: Paratypes: S107711–S107717, S170241, S170242, S174030, S174422, S174825, S175196–S175198 (Famalicão sample 25).
Fruit/fruitlet indehiscent, with a thin wall; one seeded. Style lacking. Inner layer of fruit wall with narrow, elongate fibers. Stigmatic area restricted. Seed small, anatropous, bitegmic, and mesotestal-endotestal, with thick outer integument (testa) and thin inner integument (tegmen). Mesotesta one cell layer thick, composed of larger sclerenchyma cells. Endotesta several cell layers thick, composed of small polygonal cells with endoreticulate infillings. Seed surface coarsely rugulate. Micropyle formed from inner integument. Hilum and micropyle close together, not separated by testal tissue, resulting in a wide transversely oriented micropylar-hilar opening in the testa. Ovular vascular bundle continuing beyond the chalaza on the antiraphal side of the seed to the micropyle. Embryo tiny. Endosperm cellular, not-ruminate.
From the rugose surface of the seed (Latin rugosus [wrinkled])
Cretaceous, Lower Cretaceous
below the Figueira da Foz Formation; Early Cretaceous (late Aptian–early Albian or older)
Famalicão (lat. 39°42′16″N, long. 8°46′12″W)
Plant fossil remain
macro- and meso-fossils-embryophytes except wood