Stopesia alveolata Tosh.Yamada et M.Kato

Plant Fossil Names Registry Number: PFN002354


Authors: T. Yamada & M. Kato

Rank: species

Genus: Stopesia Tosh.Yamada et M.Kato

Reference: Yamada, T. & Kato, M. (2008): Stopesia alveolata, a fossil seed of Trimeniaceae from the Lower Cretaceous (Albian) of Hokkaido, northern Japan. – Acta phytotaxonomica et geobotanica 59(3): 228–230.

Page of description: 228

Illustrations or figures: fig. 1

Name is type for

Stopesia Tosh.Yamada et M.Kato 2008


Holotype NSM-PP-9176, National Museum of Nature and Science, Tokyo, Japan
Figures: fig. 1

Original diagnosis/description

Seed ellipsoid, 3 mm long, 2.2 mm thick, anatropous, bitegmic. Endosperm well developed, occupying larger area than perisperm. Embryo minute, encased in the micropylar region of endosperm. Micropyle endo- and exostomic. Antiraphal vascular bundles absent. Inner integument operculate in endostomic region, but mostly crushed in other areas. Testa consisting of exotesta and mesotesta. Exotesta lignified, consisting of 1–5 layers of isodiametric cells, surface alveolate. Mesotesta parenchymatous, consisting of 4 or 5 layers of cells elongated longitudinally to seed axis.


The epithet is from the alveolate surface of the seed.


Cretaceous, Lower Cretaceous, Albian
Albian Hikagenosawa Formation, Yezo Group


Ponbetsu area, Mikasa City, Hokkaido

Plant fossil remain

macro- and meso-fossils-embryophytes except wood


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