Pseudoctenis

Pseudoctenis; Temporal range: Permian–Cretaceous PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Kingdom:	Plantae
Division:	Cycadophyta
Class:	Cycadopsida
Order:	Cycadales
Genus:	Pseudoctenis; Seward 1911
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[edit]

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[edit]

^ 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. 240 (4): 1616–1635. doi:10.1111/nph.19010. ISSN 0028-646X. PMID 37302411.

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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. 240 (4): 1616–1635. doi:10.1111/nph.19010. ISSN 0028-646X. PMID 37302411.

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