A taxonomic class of extinct seed-bearing plants from the Mesozoic Era that superficially resembled cycads but had distinct biological features.
From 'cycadeoid' plus the Latin plural/taxonomic suffix '-ea,' creating the formal scientific name for this extinct plant class following binomial nomenclature.
Cycadeoidea held the record as dominant understory plants for millions of years until flowering plants arrived and out-competed them—it's one of nature's greatest replacement stories!
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