Cycadeoidea
genus of plants (fossil)
Cycadeoidea is an extinct genus of bennettitalean plants known from the Cretaceous (and possibly the Jurassic) of North America, Europe and Asia. They grew as cycad-like plants with a short trunk topped with a crown of leaves.
Taxonomy
William Buckland originally gave the name to two species he described, C. megalophylla and C. microphylla, in 1828, seeing characteristics akin to living cycads. Robert Brown and Mr. Loddiges of Loddiges Nursery in Hackney had seen living cycads and urged him to name the fossils after them. The original type specimens of both taxa have not been located, so new type material has been chosen.
Classification of species within the genus is very difficult, as several trunks have been described as species, and a further fourteen species are known from detached leaf remains, but there is no way of telling which leaf remains go with which trunk remains (if any).
Description
Cycadeoidea stems were "short and barrel-shaped," with a "crown of pinnate leaves" atop the stem. The trunk was covered in imbricate leaf bases, similar to the trunks of cycads. The exact nature of the leaves that topped the stem is unclear, as the trunks are preserved without the adult leaves.
This brief starts where responsible research should: with the source description of “Cycadeoidea” as genus of plants (fossil). Everything that follows is an evidence route, not borrowed authority.
Why this record matters
The subject matters to the science & nature register because the source frames it as genus of plants (fossil). Its deeper value depends on whether names, dates, institutions and citations support that framing.
Stable identifiers, scientific names and standards terminology offer the best bridge between this overview and specialist evidence. The source revision retrieved here is dated Nov 21, 2025. The linked authority identifier is Q3699835. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1828.
Current terminology should not be projected backward without checking the classification used when the underlying evidence was created. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Check terminology, classification and the date of the cited evidence. Scientific names and technical consensus can change while older records retain historical value.
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Three-step research path
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Questions for further research
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This entry incorporates text from “Cycadeoidea” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.