Sagenopteris
| Sagenopteris | |
|---|---|
| |
| Sagenopteris phillipsii leaves, Middle Jurassic, Gristhorpe Bed, Cloughton Formation, Cayton Bay, Yorkshire. | |
Scientific classification 
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| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Division: | †Pteridospermatophyta |
| Order: | †Caytoniales |
| Family: | † Caytoniaceae
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| Genus: | †Sagenopteris Presl 1838 |
| Species | |
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See text | |
Sagenopteris is a
Description
Sagenopteris has palmately arranged leaves with anastomosing venation.
Different organs attributed to the same original plant can be reconstructed from co-occurrence at the same locality and from similarities in the stomatal apparatus and other anatomical peculiarities of fossilized cuticles.
- Sagenopteris phillipsii may have been produced by the same plant as Caytonia nathorstii (ovulate organs) and Caytonanthus arberi (pollen organs).[3]
Species
The following species have been described:[1]
- Sagenopteris colpodes
- Sagenopteris elliptica
- Sagenopteris mclearni
- Sagenopteris nilssoniana
- Sagenopteris oregonensis
- Sagenopteris phillipsii
- Sagenopteris trapialensis[2]
- Sagenopteris variabilis
- Sagenopteris williamsii[4]
Distribution
Fossils of Sagenopteris have been registered in:[1]
- Triassic
Argentina, China, Germany, Greenland, Italy, Japan, Kyrgyzstan, the Russian Federation, Sweden, Tajikistan, Ukraine, United States (Virginia, Virginia/North Carolina).
- Jurassic (to Cretaceous)
Afghanistan, Antarctica, Argentina, Azerbaijan, Belarus, Canada (British Columbia, Yukon), China, Colombia (Valle Alto Formation, Caldas), Georgia, Germany, Greenland, India, Iran, Italy, Japan, Kazakhstan, Kyrgyzstan, Mexico, Peru, Poland, Romania, the Russian Federation, Tajikistan, Turkmenistan, Ukraine, the United Kingdom, United States (Alaska, Montana, Oregon/Idaho), and Uzbekistan.
- Cretaceous
Spain, Belgium, Canada (British Columbia and Alberta),[4] Greenland, the Russian Federation, and the United States (Montana).
References
- ^ a b c Sagenopteris at Fossilworks.org
- ^ S2CID 92287804.
- JSTOR 2399379.
- ^ a b Bell, W.A. 1956. Lower Cretaceous floras of western Canada; Geological Survey of Canada, Memoir 285, p. 80-81 and plates 31, 33, 34, and 36.
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