Pseudoctenis

Pseudoctenis; Temporal range:
Scientific classification
Kingdom:	Plantae
Division:	Cycadophyta
Class:	Cycadopsida
Order:	Cycadales
Genus:	Pseudoctenis; Seward 1911[1]
Species
	P. eathiensis (type species);

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.

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.[2]

References

Seward, A.C. (1911): The Jurassic flora of Sutherland. – Transactions of the Royal Society of Edinburgh 47: 643-709.
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. doi:10.1111/nph.19010. ISSN 0028-646X.

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[1] Seward, A.C. (1911): The Jurassic flora of Sutherland. – Transactions of the Royal Society of Edinburgh 47: 643-709.

[2] 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. doi:10.1111/nph.19010. ISSN 0028-646X.