Pseudoctenis

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Pseudoctenis
Temporal range: Permian–Cretaceous
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Gymnospermae
Division: Cycadophyta
Class: Cycadopsida
Order: Cycadales
Family:† Nilssoniaceae
Genus:† Pseudoctenis
Seward (1911) [1] [2]
Species

See text.

Pseudoctenis is a genus of fossil foliage attributable to the Cycadales. It is one of the most common genera of cycad fossil foliage in the Mesozoic.

Contents

Taxonomy

The genus was erected by Albert Seward based on material from the Jurassic of Sutherland. Although he did not publish a diagnosis for the genus, he noticed the similarity with the genus Ctenis , stating that the main difference between the two is the absence of anastomoses in Pseudoctenis.

A 2023 study found this genus to be polyphyletic, with various species closely related to Ctenis , Cycadaceae, and Zamiaceae. [3]

Species

Species that have been placed in this genus include: [1]

References

  1. 1 2 "†Pseudoctenis Seward 1911 (cycads)". Paleobiology Database. Retrieved 2025-11-07.
  2. ↑ Seward, A.C. (1911): The Jurassic flora of Sutherland. – Transactions of the Royal Society of Edinburgh 47: 643-709.
  3. ↑ Coiro, Mario; Allio, Rémi; Mazet, Nathan; Seyfullah, Leyla J.; Condamine, Fabien L. (2023-06-11). "Reconciling fossils with phylogenies reveals the origin and macroevolutionary processes explaining the global cycad biodiversity". New Phytologist. 240 (4): 1616–1635. doi: 10.1111/nph.19010 . ISSN   0028-646X. PMC   10953041 . PMID   37302411.


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