Umaltolepidiaceae
| Umaltolepidiaceae | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temporal occurrence | ||||||||||||
| Rhaetium (Upper Triassic) to Lower Cretaceous | ||||||||||||
| 204 to 100 million years | ||||||||||||
| Systematics | ||||||||||||
|
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| Scientific name | ||||||||||||
| Umaltolepidiaceae | ||||||||||||
| Stanislavsky | ||||||||||||
The Umaltolepidiaceae are an extinct group of ginkgoales .
features
The Umaltolepidiaceae are characterized by the following features: The seed-bearing stem is greatly reduced. Each stalk carries a single, perhaps sometimes two, terminal ovule , which is grown in the axilla of a bract or on its abaxial side. The bracts are sessile, elongated, undivided or sometimes divided into two lobes.
The leaves are linear to lanceolate and partly belong to the Pseudotorellia type .
Systematics
The Umaltolepidiaceae family is placed in the order Ginkgoales . There are two types of it:
supporting documents
- Zhi-Yan Zhou: An overview of fossil Ginkgoales. Palaeoworld. Volume 18, No. 1, 2009, pp. 1–22, doi: 10.1016 / j.palwor.2009.01.001 .
- Thomas N. Taylor, Edith L. Taylor, Michael Krings: Paleobotany. The Biology and Evolution of Fossil Plants. 2nd Edition. Academic Press, Amsterdam et al. 2009, ISBN 978-0-12-373972-8 , p. 752.