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Tumidopteris astra
Tumidopteris astra Naug. Foss. Impr., 76(2): 271. 30 Dec 2020
- Name
- Tumidopteris astra
- Rank
- Species
- Generic Name
- [Genus] Tumidopteris
- Authors (Pub.)
- Naugolnykh S. V.
- Publication
- A new species of the genus Tumidopteris Naugolnykh from the Permian of the Pechora Cis-Urals, Russia [2020/12]
- Journal
- Fossil Imprint
- Volume
- 76
- Issue
- 2
- Page number
- 271
- Year
- 2020
- Fossil Status
- foliage (fertile)
- Stratigraphy
- Roadian
- Location
- Borehole IK-675, depth 961.7 m, Pechora coal-basin, Komi Republic, Russian Federation
- Paleoregion
- Angarida
Data for Holotypus
- Repository
- State Darwin Museum, Moscow, Russian Federation
- Repository Number
- GIN 4851/343h
- Diagnosis
- Fronds at least bipinnate. Fertile pinnules
from pecopteroid to sphenopteroid, of subtriangular shape,
with acute apices. Venation pinnate, with thin undulating
midvein and three to five pairs of lateral veins. Lateral veins
simple to dichotomizing up to three times. Terminations
of lateral veins on fertile pinnules bear rosette-like sori.
Each sorus consists of six to seven sporangia fused by their
basal parts. Sporangia of short-clavate or prolonged ovoid
shape, with small shallow sinus at apex, with wide indistinct
annulus and vertical split for releasing spores. Sterile
pinnules similar to fertile ones, but lacking sporangia.
Associated spores round to ovoid, with small trilete mark.
Measurements of morphological structures are as
followed: largest pinnule size: 7 mm long and 4 mm wide;
average size of sporangia: 500 μm long, 300 μm wide; size
of sporangial cells: 150 μm long, 60–70 μm wide; number of
rows of cells in the annulus: presumably 1.
