Grenana
| Grenana | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temporal occurrence | ||||||||||||
| Middle Jurassic | ||||||||||||
| 175 to 161 million years | ||||||||||||
| Locations | ||||||||||||
| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Grenana | ||||||||||||
| Samylina | ||||||||||||
Grenana is an extinct seed plant of the Ginkgoaceae familyand a relative of the Ginkgo . Only the species Grenana angrenica is known.
features
The seed organs resemble Nehvizdyella in that the seeds are enclosed in a large cupula . Otherwise the seeds are similar to those of ginkgo .
The leaves are of the Baiera or Sphenobaiera type . They were initially assigned to the seed ferns , only later was it recognized that they belong to the Ginkgoales .
distribution
Grenana is known from the middle Jura near Angren in Uzbekistan.
Systematics
Grenana is only known through the type species Grenana angrenica . Species and genus were first described by Samylina in 1990 .
supporting documents
- Zhi-Yan Zhou: An overview of fossil Ginkgoales. In: 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.