Thomasostrobus longus Opluštil, Bek et Drábková

Plant Fossil Names Registry Number: PFN000369


Authors: S. Opluštil, J. Bek & J. Drábková

Rank: species

Reference: Opluštil, S., Bek, J. & Drábková, J. (2009): Anew bisporangiate lycopsid cone genus Thomasostrobus gen. nov. from the Late Pennsylvanian of the Intra-Sudetic Basin (Czech Republic). – Bulletin of Geosciences 84(2): 283–300.

Page of description: 286

Illustrations or figures: figs 1A, 2–4

Name is type for

Thomasostrobus Opluštil, Bek et Drábková 2009


Holotype ZŠ 307a, b, Czech Geological Survey, Prague, the Czech Republic
Figures: fig. 1A, 2

Note: Cone indicated as “H” on specimen ZŠ 307a, b (part and counterpart).

Original diagnosis/description

Bisporangiate cylindrical strobili, more than 230 mm long, 18–20 mm wide without distal laminae and 24–26 mm wide including them, with lower megasporangiate and upper microsporangiate parts. Axis 4 mm in diameter. Pedicels triangular, 6–7 mm long, in low spirals perpendicular
to the cone axis, distal laminae triangular with straight entire margins, 17–22 mm long and 3 mm wide at the base. Sporangia oval, about 5.5–6.5 mm long and 2 mm wide. Trilete circular to subcircular microspores. Exine of both surfaces laevigate. Rays of trilete mark with prominent labrum. Circular tectate megaspores with subgula. Triradiate ridges and part of the contact area are elevated near the apex and create a regular pyramidal triangular subgula. The sculpture of the three-layered exine is laevigate and punctate.


According to the apparent length of this cone species.


Carboniferous, Pennsylvanian
Radvanice group of coals (Stephanian B, Late Pennsylvanian), Jívka Member, Odolov Formation.


Czech Republic
Kateřina (formerly Stachanov) Mine in Radvanice near Trutnov, NE Bohemia, Intra-Sudetic Basin.

Plant fossil remain

macro- and meso-fossils-embryophytes except wood


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