Anacostia marylandensis E.M.Friis, P.R.Crane et K.R.Pedersen

Plant Fossil Names Registry Number: PFN001971


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

Rank: species

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

Reference: Friis, E. M., Crane, P. R. & Pedersen, K. R. (1997): Anacostia, a new basal angiosperm from the Early Cretaceous of North America and Portugal with trichotomocolpate/monocolpate pollen. – Grana 36: 225–244.

Page of description: 228

Illustrations or figures: figs 1–3

Name is type for

Anacostia E.M.Friis, P.R.Crane et K.R.Pedersen 1997


Holotype PP44159, Paleobotanical Collections, Department of Geology, The Field Museum, Chicago, Illinois, USA
Figures: figs 1A, E, H, 2A

Note: Holotype from sample 175 Kenilworth.

Original diagnosis/description

Fruiting units semicircular to obovate in outline, with a straight or slightly convex ventral margin; fruiting units without wing or with collapsed cuticle of fruit wall forming a narrow wing-like rim around seed; epidermal cells of fruit wall small, each frequently with a central, papillate projection. Seed semicircular to obovate in outline, with slightly pointed micropylar area; outer cells of testa cuboid, with infillings showing honeycomb-like pattern.


From Maryland, the state where the fossils were collected.


Cretaceous, Lower Cretaceous, Albian
Patapsco Formation, Potomac Group (basal part of palynological Subzone II-B, early or middle Albian)


United States
Kenilworth (Bladensburg), west facing exposure overlooking Washington DC, Prince Georges County, Maryland

Plant fossil remain

macro- and meso-fossils-embryophytes except wood


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