Sagenopteris

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Sagenopteris
Temporal range: Triassic-Early Cretaceous
~242–105 Ma
Sagenopteris phillipsi Natural History Museum v18596 Retallack 1980.jpg
Sagenopteris phillipsii leaves, Middle Jurassic, Gristhorpe Bed, Cloughton Formation, Cayton Bay, Yorkshire.
Scientific classification
Kingdom: Plantae
Division: Pteridospermatophyta
Order: Caytoniales
Family: Caytoniaceae
Genus: Sagenopteris
Presl 1838
Species

Sagenopteris is a genus of extinct seed ferns from the Triassic to late Early Cretaceous.[1]

Description[edit]

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.

Species[edit]

The following species have been described:[1]

Distribution[edit]

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

Belgium, Canada (British Columbia), Greenland, the Russian Federation, and the United States (Montana).

References[edit]

  1. ^ a b c Sagenopteris at Fossilworks.org
  2. ^ Retallack, G.J. & Dilcher, D.L. (1988). "Reconstructions of selected seed ferns". Missouri Botanical Garden Annals. 75: 1010–1057.