Nehvizdyella
| Nehvizdyella | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temporal occurrence | ||||||||||||
| Upper Cretaceous ( Cenomanium ) | ||||||||||||
| 99.6 to 93.6 million years | ||||||||||||
| Locations | ||||||||||||
| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Nehvizdyella | ||||||||||||
| Kvaček , Falcon-Lang & Dašková |
Nehvizdyella is an extinct seed plant of the Ginkgoaceae familyand a relative of the Ginkgo . Only the species Nehvizdyella bipartita is known.
features
The seminal organs are compound structures. They consist of a main axis and two short side axes. At each end there is a large, cupula- like structure that is probably homologous to the collar in recent ginkgo . An orthotropic ovule sits in the cupula . In the early stages of development, the ovule and the young seed are completely surrounded by the cupula, with the exception of the micropyle .
Monosulcate pollen grains of the Cycadopites type were found on the seeds .
To Nehvizdiyella bipartite include sheets of type Eretmophyllum obtusum and short rung of the type Pecinovicladus kvacekii . The trunk wood was described as Ginkgoxylon cf. gruettii . These four Morphotaxa occur together in monodominant find layers at four localities, which is why it is concluded that they belong to a species.
distribution
Nehvizdyella is only known from the Cenomanian ( Upper Cretaceous ) Czech Republic. It was found in the Peruc-Korycany formation. Analyzes of the sites suggest that these plants grew in salt marshes on the coast. This is the first indication of the existence of halophytes among the Ginkgophyta .
Systematics
From Nehvizdyella only is the type species Nehvizdyella bipartite known. The genus was placed in the family Ginkgoaceae by the first descriptors . This assignment is also followed by Zhou (2009) and Taylor, Taylor and Krings (2009).
supporting documents
- Zhi-Yan Zhou: An overview of fossil Ginkgoales . Palaeoworld, Volume 18, 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 . Second Edition, Academic Press 2009, ISBN 978-0-12-373972-8 . P. 751.