Sagenopteris williamsii
From Wikipedia, the free encyclopedia
| Sagenopteris williamsii | |
|---|---|
 | |
| Sagenopteris williamsii leaflet from the Early Cretaceous Grande Cache Member of the Gates Formation near Grande Cache, Alberta. | |
Scientific classification  | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Division: | †Pteridospermatophyta |
| Order: | †Caytoniales |
| Family: | †Caytoniaceae |
| Genus: | †Sagenopteris |
| Species: | †S. williamsii |
| Binomial name | |
| †Sagenopteris williamsii (Newberry) W.A. Bell | |
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 in 1891, based on specimens from the Great Falls coal field in Montana.[1] In 1956, it was referred to Sagenopteris by W.A. Bell based on additional specimens from western Canada.[2]
