''Sagenopteris'' is a
genus
Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial nom ...
of extinct
seed fern
A seed is an Plant embryogenesis, embryonic plant enclosed in a testa (botany), protective outer covering, along with a food reserve. The formation of the seed is a part of the process of reproduction in seed plants, the spermatophytes, includ ...
s from the
Triassic
The Triassic ( ) is a geologic period and system (stratigraphy), system which spans 50.6 million years from the end of the Permian Period 251.902 million years ago (Year#Abbreviations yr and ya, Mya), to the beginning of the Jurassic Period 201.36 ...
to late
Early Cretaceous.
[''Sagenopteris'']
at Fossilworks.org
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
''Sagenopteris phillipsii'' are leaves of extinct species of seed ferns.
Description
''Sagenopteris phillipsii'' has narrow, palmately arranged leaves with anastomosing venation
Whole plant reconstructions
Different organs attrib ...
'' may have been produced by the same plant as ''
Caytonia nathorstii
''Caytonia nathorstii'' is an extinct species of seed fern
A seed is an Plant embryogenesis, embryonic plant enclosed in a testa (botany), protective outer covering, along with a food reserve. The formation of the seed is a part of the pro ...
'' (ovulate organs) and ''
Caytonanthus arberi'' (pollen organs).
Species
The following species have been described:
[
* ''Sagenopteris colpodes''
* ''Sagenopteris elliptica''
* ''Sagenopteris mclearni''
* ''Sagenopteris nilssoniana''
* ''Sagenopteris oregonensis''
* '']Sagenopteris phillipsii
''Sagenopteris phillipsii'' are leaves of extinct species of seed ferns.
Description
''Sagenopteris phillipsii'' has narrow, palmately arranged leaves with anastomosing venation
Whole plant reconstructions
Different organs attrib ...
''
* ''Sagenopteris trapialensis
''Sagenopteris trapialensis'' are leaves of extinct species of seed fern from Chubut, Patagonia Argentina. At the moment, ''S. trapialensis'' is based on impression fossils found in the Early Jurassic Lonco Trapial Formation near Paso del Sap ...
''
* ''Sagenopteris variabilis''
* ''Sagenopteris williamsii
''Sagenopteris williamsii'' is an extinct pteridosperm (seed fern) that is known from the late Jurassic and Early Cretaceous strata of the western interior of North America. It was first described as ''Chiropteris williamsii'' by J.S. Newberry ...
''[Bell, W.A. 1956. Lower Cretaceous floras of western Canada; ]Geological Survey of Canada
The Geological Survey of Canada (GSC; french: Commission géologique du Canada (CGC)) is a Canadian federal government agency responsible for performing geological surveys of the country, developing Canada's natural resources and protecting the e ...
, Memoir 285, p. 80-81 and plates 31, 33, 34, and 36.
Distribution
Fossils of ''Sagenopteris'' have been registered in:[
;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 and Alberta),] Greenland, the Russian Federation, and the United States (Montana).
References
Pteridospermatophyta
Triassic first appearances
Triassic plants
Jurassic plants
Early Cretaceous plants
Early Cretaceous genus extinctions
Prehistoric plant genera
Fossil record of plants
Mesozoic Antarctica
Mesozoic life of Asia
Mesozoic life of Europe
Mesozoic life of North America
Prehistoric plants of North America
Jurassic Canada
Jurassic Mexico
Jurassic United States
Prehistoric plants of South America
Mesozoic life of South America
Triassic Argentina
Jurassic Argentina
Fossils of Argentina
Jurassic Colombia
Fossils of Colombia
Jurassic Peru
Fossils of Peru
Fossil taxa described in 1838
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