Mayoa portugallica E.M.Friis, K.R.Pedersen et P.R.Crane

Plant Fossil Names Registry Number: PFN002765


Authors: E. M. Friis, K. R. Pedersen & P. R. Crane

Rank: species

Genus: Mayoa E.M.Friis, K.R.Pedersen et P.R.Crane

Reference: Friis, E. M., Pedersen, K. R. & Crane, P. R. (2004): Araceae from the Early Cretaceous of Portugal: Evidence on the emergence of monocotyledons. – Proceedings of the National Academy of Sciences of the United States of America 101(47): 16565–16570.

Page of description: 16568

Illustrations or figures: figs 1, 2

Name is type for

Mayoa E.M.Friis, K.R.Pedersen et P.R.Crane 2004


Original diagnosis/description

Pollen inaperturate. Surface of pollen wall is striate with densely spaced ribs (muri) separated by narrow grooves (striae). Ribs are arranged in a distinctive pattern in which two sets of ribs each radiate from a pair of divergence points. Main axes of the two sets of ribs are at an angle of 45–90° to each other. Pollen wall is thin and consists of an outer exine of solid ribs supported by a very thin granular infratectal layer and an inner thin granular endexine that forms a continuous layer under the ribs.


From Portugal where the fossil was collected.


Cretaceous, Lower Cretaceous
basal member of the Almargem Formation (Late Barremian or Early Aptian)


Open-cast clay pit northeast of Torres Vedras (39°06′13″N, 9°14′47″W)

Plant fossil remain

pollen and spores