Phylogenetic relationships in Calochilus (∼30 species) were inferred based on a supermatrix of 81 loci including 22 species. To examine the spatio-temporal evolution of Calochilus, divergence-time estimations were conducted within a Bayesian framework using an uncorrelated relaxed molecular-clock model, followed by maximum-likelihood ancestral-range reconstructions comparing four biogeographic models. To trace the evolution of key floral and vegetative characters, maximum-likelihood ancestral-character reconstructions were carried out. The stem age of Calochilus was dated to ∼12.0 million years ago in the mid-Miocene. Divergence of Calochilus into a tropical and a temperate clade was inferred to have occurred ∼7.6 million years ago in the late Miocene. Northern Australia was reconstructed as the ancestral area of the tropical clade and the Euronotian region for the temperate clade. Range expansions from Australia to other Australasian regions, such as New Zealand and New Guinea, were inferred to have occurred only in recent geological times, commencing in the Pleistocene. The infrageneric classification for Calochilus was revised, erecting two subgenera, subgenus Calochilus and subgenus Tropichilus subgen. nov. Section Calochilus Szlach. was recircumscribed, and sect. Abrochilus sect. nov., and section Placochilus sect. nov. were erected. Identification keys to subgenera and sections and a taxonomic synopsis of the genus are provided.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.
Vol. 31 • No. 5-6