| Alethopteris | |
|---|---|
| |
| Alethopteris grandini, late Carboniferous, Kansas. At the Royal Tyrrell Museum of Palaeontology. | |
Scientific classification 
| |
| Kingdom: | Plantae |
| Clade: | Embryophytes |
| Clade: | Tracheophytes |
| Clade: | Spermatophytes |
| Division: | †Pteridospermatophyta |
| Order: | †Medullosales |
| Family: | †Alethopteridaceae |
| Genus: | †Alethopteris |
| Species | |
| |
Alethopteris is a prehistoric plant genus of fossil pteridospermatophytes (seed ferns) that developed in the Pennsylvanian (around 320 to 300 million years ago).1
