Janegraya
| Janegraya Temporal range:
| |
|---|---|
| |
| Holotype of Janegraya sibylla, from Douglas Lake Member of Lenoir Limestone, at Douglas Dam, Tennessee[1] | |
Scientific classification 
| |
| Kingdom: | Plantae |
| Division: | Marchantiophyta |
| Class: | Marchantiopsida |
| Order: | Sphaerocarpales |
| Family: | Sphaerocarpaceae |
| Genus: | †Janegraya Retallack (2019)[1] |
| Type species | |
| Janegraya sibylla Retallack (2019)
| |
Janegraya is a genus of fossil with controversial interpretation from the Middle Ordovician (Darriwilian, 460 million years old) Douglas Lake Member of the Lenoir Limestone from Douglas Dam Tennessee.[1] The generic name honors Jane Gray, and the epithet means "prophetess".
Description
Janegraya is considered as a minute fossil balloonwort (Sphaerocarpaceae) by Gregory Retallack, and similar to living Sphaerocarpos. Its spores are permanent tetrads closed within a thin perine, widely known among Ordovician dispersed spores as Tetrahedraletes.[2]
Biological affinities
The interpretation of this fossil as an Ordovician example of Sphaerocarpaceae has been questioned in some quarters [3] but accepted in others.[4]
References
- ^ a b c Retallack, G.J. (2019). "Ordovician land plants and fungi from Douglas Dam, Tennessee". The Palaeobotanist. 68: 1–33.
- ^ Wellman, Charles H.; Cascales-Miñana, Borja; Servais, Thomas (2023). "Terrestrialization in the Ordovician". Geological Society, London, Special Publications. 532 (1): 1–20. doi:10.1144/SP532-2022-92. S2CID 253011815.
- ^ Edwards, Dianne; Morris, Jennifer L.; Axe, Lindsey; Duckett, Jeffrey G.; Pressel, Silvia; Kenrick, Paul (2022). "Piecing together the eophytes – a new group of ancient plants containing cryptospores". New Phytologist. 233 (3): 1440–1455. doi:10.1111/nph.17703. ISSN 0028-646X. S2CID 244495761.
- ^ Leigh, Egbert (2022). "Fossil soils: trace fossils of ecosystems on land and windows on the context of evolution". Evolution Education and Outreach. 15:14: 1–5. doi:10.1186/s12052-022-00173-3. S2CID 255483235.
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