Family Bennettitaceae is a group of extinct, seed-bearing plants that lived during the Mesozoic Era. Synonyms for this family include the Cycadeoidaceae and the Williamsoniaceae. These plants had characteristics of both cycads and ferns and were important components of prehistoric flora. They produced large cones that contained seeds and likely had a reproductive strategy similar to modern-day conifers. The Bennettitaceae family played a vital role in the evolution of seed plants and the development of modern ecosystems. Although they no longer exist today, they have left behind a rich fossil record that scientists continue to study and learn from.