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Chautemsia calcicola : A new genus and species of Gloxinieae (Gesneriaceae) from Minas Gerais, Brazil
Author(s) -
de Araújo Andréa Onofre,
Souza Vinicius Castro,
Perret Mathieu
Publication year - 2010
Publication title -
taxon
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 81
eISSN - 1996-8175
pISSN - 0040-0262
DOI - 10.1002/tax.591019
Subject(s) - biology , monophyly , clade , phylogenetic tree , genus , internal transcribed spacer , taxon , lineage (genetic) , evolutionary biology , gesneriaceae , tribe , zoology , sister group , botany , genetics , gene , sociology , anthropology
A new species of Gesneriaceae discovered in remnants of deciduous forests on limestone outcrops in Minas Gerais, Brazil, is described and compared with morphologically related taxa. This plant presents the diagnostic features of the tribe Gloxinieae, but a unique combination of morphological traits distinguishes this taxon from previously described genera. Its phylogenetic position was inferred based on analyzing DNA sequences variation of five loci: the rpl16 intron, rps16 intron, trnL ‐ F intron‐spacer, a portion of the plastid‐expressed glutamine synthetase gene ( ncpGS ) and the ribosomal DNA internal transcribed spacer (ITS). Molecular phylogenetic analyses confirm the position of this new species in the Gloxinieae, as a sister lineage of a clade including the Brazilian genera Mandirola and Goyazia . However, tests using topological constraints do not reject the alternative relationship that places this taxon with Gloxiniopsis in a monophyletic group. To accommodate this species in the current generic circumscription of Gloxinieae, the new genus Chautemsia A.O. Araujo & V.C. Souza is created.