Bennettitales is an order of plants in the anthophyte clade that first appeared in the Triassic period and became extinct toward the end of the Cretaceous. It comprises two groups: cycadeoids, which had stout trunks and bisporangiate strobili (cones serving as their reproductive structures), and relatives of Williamsonia and Williamsoniella, which had slender, branching trunks and either bisporangiate or monosporangiate strobili. Scientific classification or biological classification refers to how biologists group and categorize extinct and living species of organisms. ... Divisions Green algae land plants (embryophytes) non-vascular embryophytes Hepatophyta - liverworts Anthocerophyta - hornworts Bryophyta - mosses vascular plants (tracheophytes) seedless vascular plants Lycopodiophyta - clubmosses Equisetophyta - horsetails Pteridophyta - true ferns Psilotophyta - whisk ferns Ophioglossophyta - adderstongue ferns seed plants (spermatophytes) †Pteridospermatophyta - seed ferns Pinophyta - conifers Cycadophyta - cycads Ginkgophyta - ginkgo Gnetophyta - gnetae Magnoliophyta - flowering... Greek clados = branch) or phylogenetic systematics is a branch of biology that determines the evolutionary relationships of living things based on derived similarities. ... The Triassic is a Geologic period that extends from about 248 to 202 million years (My or megayears) before the present. ... The Cretaceous period is one of the major divisions of the geologic timescale, reaching from the end of the Jurassic period (about 135 mya) to the beginning of the Paleocene epoch of the Tertiary period (65 mya). ... A cone (in formal botanical usage: strobilus, plural strobili) is an organ on plants in the division Pinophyta (conifers) that contains the reproductive structures. ... Reproduction is the creation of one thing as a copy of, product of, or replacement for a similar thing, e. ...