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Ctenis is a genus of fossil foliage attributable to the Cycadales, being one of the most common genera of cycad fossil leaves in the Mesozoic.
Though Ctenis-like leaves are known from the Late Permian Umm Irna Formation of Jordan, Ctenis fossils becomes more common from the Late Triassic onwards. In the Jurassic, many Ctenis species are retrieved from Europe, North America, and Asia. In the Early Cretaceous, Ctenis is still found in Europe (i.e. in the Wealden Group) and Asia, but from the Late Cretaceous its range seems to retreat to more Northern Latitudes in the Siberian region and North America and Southern latitudes in Australia. The last members of this genus are found in the Eocene of North America.
Text excerpted from the Wikipedia article Ctenis by its contributors, under CC BY-SA 4.0; the excerpts are shared under the same licence.
