Dating origin orchidaceae datingtampa com
Tribes Tropidieae and Sobralieae form a that forms one of the basal lineages.
However relationships among the core lineages are unclear, and it appears that they have rapidly radiated.
Regardless, the number of orchid species nearly equals the number of bony fishes and is more than twice the number of bird species, and about four times the number of mammal species.
The family also encompasses about 6–11% of all seed plants.
Moreover, two new orchid fossils described in 2009 have not yet been incorporated in a molecular dating analysis.
Here we compare the ages of major orchid clades estimated under two widely used methods, a Bayesian relaxed clock implemented in BEAST and Penalized Likelihood implemented in r8s.
It appears that Epidendroideae have rapidly radiated (Pridgeon et al., 2005), although further work is need on their tribal and subtribal circumscriptions (Chase, 2005; Cameron, 2006; Carlsward et al., 2006; Kułak et al., 2006) Within Epidendroideae, Tribe Dendrobieae represents c.
The determination of which family is larger is still under debate, because verified data on the members of such enormous families are continually in flux.
The most recent classifications of the family recognizes five subfamilies (Chase et al., 2003; Chase, 2005), with the triandrous Apostasioideae and diandrous Cypripedioideae basal to the three monandrous subfamilies: Vanilloideae and the most diverse and crown sister pair of Epidendroideae and Orchidoideae.
The Epidendroideae are the largest subfamily and include the majority of the tropical epiphytic species, but relationships between core lineages in the subfamily are unclear.
Meliorchis caribea is an extinct, early to middle Miocene orchid known only from a packet of pollen attached to the wing of a stingless bee, Proplebeia dominicana, trapped in Dominican amber.
It was the first fossil orchid ever described, and allowed for a revised estimate of the time of origin of the Orchidaceae to the Mesozoic.