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Título del libro: Tree Of Life: Evolution And Classification Of Living Organisms Título del capítulo: Eudicotyledons The Greatest Flower Diversity in Angiosperms
Phylogenies based on morphological characters as well as on DNA
sequences have identified a clade within angiosperms (flowering plants)
that includes all species that develop tricolpate pollen. This group,
named eudicots (eudicotyledons, Eudicotyledoneae), comprises
approximately 198,000 species distributed among approximately 10,400
genera, 336 families and 51 orders, and represents more than 73% of
living angiosperms. Eudicots are strongly supported as a monophyletic
group by all phylogenetic reconstructions, and recent studies suggest
that the Ceratophyllales (a small group of aquatic plants) and monocots
are the closest angiosperm relatives. The tree of eudicots exhibits six
early diverging clades, and a large core clade named Pentapetalae, which
includes the vast majority of species. The extensive Pentapetalae group,
in turn, is formed by eight clades whose interrelationships are not yet
fully understood. Most Pentapetalae members display a flower structure
characterized by a bipartite perianth formed by calyx and corolla, and
(usually) a fixed number of organs in each whorl: five in the perianth
and androecium, and two (or three) in the gynoecium. Phylogenetic
studies of neutral and regulatory genes have documented numerous gene
duplications apparently associated with Pentapetalae and possibly an
entire genome duplication at an early evolutionary stage. Among
duplicated genes are members of the MADS-box family, which regulate a
variety of key functions and were probably highly involved in the
evolution of the bipartite perianth. The fossil record and molecular
clock estimates indicate that eudicot diversification had begun by the
Early Cretaceous (Barremian-Aptian age, 125 million years ago), while
the diversification of Pentapetalae would have begun by at least the
Cenomanian (Late Cretaceous, 100-93.5 million years ago).