Pteroheterochrosperma horseflyensis MacK.A.Sm., Greenwalt et Manchester

Plant Fossil Names Registry Number: PFN003031


Authors: M. K. A. Smith, D. Greenwalt & S. R. Manchester

Rank: species

Genus: Pteroheterochrosperma MacK.A.Sm., Greenwalt et Manchester

Reference: Smith, M. K. A., Greenwalt, D. & Manchester, S. R. (2023): Diverse fruits and seeds of the mid-Eocene Kishenehn Formation, northwestern Montana, USA, and their implications for biogeography. – Fossil Imprint 79(1): 37–88.

Page of description: 65

Illustrations or figures: text-fig. 12a

Name is type for

Pteroheterochrosperma MacK.A.Sm., Greenwalt et Manchester 2023


Original diagnosis/description

Winged structure circular; wing has thick striations (up to 0.1 mm) radiating around seed body starting from the seed body and mostly terminating at the margin of the wing, some striations bifurcating; seed body obovate with rugulate sculpture.


The specific epithet is for the Horsefly, British Columbia where the first fossils of this species were described.


Paleogene, Eocene, Lutetian
Kishenehn Formation, ca. 44 Ma


United States
Dakin Site

Plant fossil remain

macro- and meso-fossils-embryophytes except wood


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