Bennettitales

Bennettitales (also known as cycadeoids) is an extinct order of seed plants that first appeared in the Permian period and became extinct in most areas toward the end of the Cretaceous. Bennettitales were amongst the most common seed plants of the Mesozoic, and had morphologies including shrub and cycad-like forms. The foliage of bennettitaleans is superficially nearly indistinguishable from that of cycads, but they are distinguished from cycads by their more complex flower-like reproductive organs, at least some of which were likely pollinated by insects.

genus of plants (fossil)

Williamsoniaceae is a family within the Bennettitales, an extinct group of seed plants. Members of this family are believed to have been around two meters tall and with widely serrate leaves along a central stem. Reproductive organs of the Williamsoniaceae have varied widely in the fossil record but almost all have been found to be borne on stalks emerging from a ring of leaves. thumb|Fossils and schematic diagram of Pterophyllum (plant)|Pterophyllum bavieri from the Late Triassic ([[Rhaetian) of northern Iran, Shemshak Group, A and B: leaves attached to a branch C: complete leaf]]

genus of plants (fossil)

Zamites is an extinct genus of plants in the family Williamsoniaceae that lived from the Triassic to the Eocene. This plant is reported in the Mesozoic from North and South America, Europe, Asia, Africa, and Antarctica, and in the Cenozoic only in North America.

Cycadeoidaceae is a family of bennettitalean plants which flourished in the Mesozoic era. Two genera, Cycadeoidea and Monanthesia, are currently recognised though most species are poorly known. They had a similar morphology to cycads, with thick, branchless trunks covered in scale leaves. alt=Cycadeoidea_sp|thumb|Cycadeoidea (a member of the Cycadeoidaceae) on display at the [[Naturmuseum Senckenberg]]