Otozamites crassipinnatus Tosh.Yamada et K.Uemura

Plant Fossil Names Registry Number: PFN002352

Act LSID: urn:lsid:plantfossilnames.org:act:2352

Authors: T. Yamada & K. Uemura

Rank: species

Reference: Yamada, T. & Uemura, K. (2008): The plant fossils from the Kaizara Formation (Callovian, Jurassic) of the Tetori Group in the Izumi district, Fukui Prefecture, Central Japan. – Paleontological Research 12(1): 1–17., link

Page of description: 7

Illustrations or figures: fig. 3


Holotype NSM­-PP-­9914, National Museum of Nature and Science, Tokyo, Japan
Figures: fig. 3F, G

Note: Paratypes: NSM-PP-9916 (Figure 3H), NSM-PP-9920 (Figure 3I). NSM-PP-9915 (Figure 3J), housed in National Museum of Nature and Science, Tokyo, Japan.

Original diagnosis/description

Rachis completely covered by pinnae. Pinnae alternate, thick, convex adaxially, arising at 60°. Pinna margin reflexed. Acroscopic angle of pinna overlapping diagonal basiscopic angle of pinna. Pinna apex obtuse to round. Veins radiating from pinna attachment, forked, at maximum concentration there are ca. 40 per cm.


Compound of Latin adjective “crassus” meaning thick and Latin adjective “pinnatus” meaning pinnae.


Jurassic, Middle Jurassic, Callovian
Kaizara Formation (Kuzuryu Subgroup), age of the Kaizara Formation is precisely determined as latest Bathonian to early Callovian


Horadani, Kaizara area, Izumi district, Ohno City, Fukui Prefecture

Plant fossil remain

macro- and meso-fossils-embryophytes except wood


Use comments to notify PFNR administrators of mistakes or incomplete information relevant to this record.