نتایج جستجو برای: polyphyletic
تعداد نتایج: 874 فیلتر نتایج به سال:
The hypothesis that Dysoxylum (Meliaceae), as currently circumscribed, is polyphyletic tested. Analyses based on nuclear ribosomal ITS, ETS, the plastid trnL-trnF intron and intergenic spacer, well rps15-ycf1 spacer support this hypothesis. Six strongly supported clades within s.l. were recovered, in large part supporting classification of Harms. Based largest molecular phylogenetic tree hither...
BACKGROUND The Astrophorida (Porifera, Demospongiae(p)) is geographically and bathymetrically widely distributed. Systema Porifera currently includes five families in this order: Ancorinidae, Calthropellidae, Geodiidae, Pachastrellidae and Thrombidae. To date, molecular phylogenetic studies including Astrophorida species are scarce and offer limited sampling. Phylogenetic relationships within t...
Chlamydia trachomatis causes sexually transmitted infections and the blinding disease trachoma. Current data on C. trachomatis phylogeny show that there is only a single trachoma-causing clade, which is distinct from the lineages causing urogenital tract (UGT) and lymphogranuloma venerum diseases. Here we report the whole-genome sequences of ocular C. trachomatis isolates obtained from young ch...
The schizothoracine fish, also called snow trout, are members of the Cyprinidae, and are the most diversified teleost fish in the Qinghai-Tibetan Plateau (QTP). Clarifying the evolutionary history of the schizothoracine fish is therefore important for better understanding the biodiversity of the QTP. Although morphological and molecular phylogenetic studies have supported the monophyly of the S...
The traditional avian subfamily Furnariinae, a group of terrestrial ovenbirds typical of the Andean and Patagonian arid zones, consists of the genera Furnarius, Cinclodes, Geositta, Upucerthia, Chilia, and Eremobius. We investigated phylogenetic relationships within the Furnariinae, with particular attention to the nine species of the genus Upucerthia, using nuclear and mitochondrial DNA sequen...
Evolutionary relationships were inferred among a worldwide sample of Ascochyta fungi from wild and cultivated legume hosts based on phylogenetic analyses of DNA sequences from the ribosomal internal transcribed spacer regions (ITS), as well as portions of three protein-coding genes: glyceraldehyde-3-phosphate-dehydrogenase (G3PD), translation elongation factor 1-alpha (EF) and chitin synthase 1...
Abstract Parvipelvia is a major clade of ichthyosaurians that diversified during the Triassic-Jurassic transition. The interrelationships early parvipelvians remain unclear and many genera are loosely diagnosed, such as Temnodontosaurus, an ecologically important genus from Early Jurassic Western Europe. One taxon concentrates taxonomic issues: ‘Ichthyosaurus’ acutirostris was previously assign...
Planktic foraminifera have traditionally been classified within a single order: Globigerinida. However, recent phylogenetic studies, both molecular and stratophenetic, are evidencing the polyphyletic origin of planktic from several benthic ancestors. At least four independent events benthic-planktic transition identified. One them occurred after Cretaceous–Paleogene boundary mass extincti...
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