Corynepteris
| Corynepteris | ||||||||||||
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| Temporal occurrence | ||||||||||||
| Mississippian to Permian | ||||||||||||
| Locations | ||||||||||||
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North and South America, Europe |
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Corynepteris | ||||||||||||
| Baily |
Corynepteris is a genus from the order Zygopteridales (primitive ferns ).
features
Corynepteris is a genus of fertile fronds of the Alloiopteris type and is known from imprint fossils as well as structurally preserved fossils. The leaves have long, slender leaflets on which fertile leaflets stick out almost vertically. In Corynepteris scottii consisting vascular bundles in the Fieder- rachis of an oval beam with two protoxylem poles, similar to Etapteris scottii . Fertile and sterile leaflets stand in two rows. The fertile ones are usually more divided. Each of them has a sorus on a short stalk with a vascular bundle. Each sorus consists of five to ten slightly curved, egg-shaped sporangia . The annulus is longitudinal and U- to V-shaped. The sporangia are 1 to 1.5 mm long and 0.5 to 0.8 mm wide.
All species form small, trilete (three-pointed scars) spores . The ornamentation of the spore surface is varied, therefore the spores are placed in several genera of sporae dispersae : Apiculatisporis , Verrucosisporites and Cyclogranisporites .
Corynepteris australis is native to the Permian of southern Argentina and was the first report for this genus from the southern hemisphere in 1986.
Corynepteris cabrierensis comes from the Mississippium of southern France and has Alloiopteris leaves on Corynepteris -like fertile forms. This is the oldest species of the genus to date (2009). The large fronds are based on a strong main rachis.
supporting documents
- 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 , pp. 414-416.