scispace - formally typeset
Search or ask a question
Topic

Genus

About: Genus is a research topic. Over the lifetime, 68921 publications have been published within this topic receiving 590966 citations. The topic is also known as: monospecies genus & genus (zoology).


Papers
More filters
Journal ArticleDOI
TL;DR: A DNA barcoding approach based on mitochondrial cytochrome oxidase I gene sequences was used in order to detect possible cryptic diversity and to test the circumpolarity of some lysianassoid species.
Abstract: Recent molecular analyses revealed that several so-called "circum-Antarctic" benthic crustacean species appeared to be complexes of cryptic species with restricted distributions. In this study we used a DNA barcoding approach based on mitochondrial cytochrome oxidase I gene sequences in order to detect possible cryptic diversity and to test the circumpolarity of some lysianassoid species. The orchomenid genus complex consists of the genera Abyssorchomene, Falklandia, Orchomenella, Orchomenyx and Pseudorchomene. Species of this genus complex are found throughout the Southern Ocean and show a high species richness and level of endemism. In the majority of the studied species, a genetic homogeneity was found even among specimens from remote sampling sites, which indicates a possible circum-Antarctic and eurybathic distribution. In four investigated species (Orchomenella (Orchomenopsis) acanthurus, Orchomenella (Orchomenopsis) cavimanus, Orchomenella (Orchomenella) franklini and Orchomenella (Orchomenella) pinguides), genetically divergent lineages and possible cryptic taxa were revealed. After a detailed morphological analysis, O. (O.) pinguides appeared to be composed of two distinct species, formerly synonymized under O. (O.) pinguides. The different genetic patterns observed in these orchomenid species might be explained by the evolutionary histories undergone by these species and by their different dispersal and gene flow capacities. © 2010 Elsevier Ltd.

76 citations

Journal ArticleDOI
16 Dec 2015-PLOS ONE
TL;DR: Six new species from west and central sub-Saharan Africa are described, including four tetraploids and two dodecaploids, and the recognition of two subgenera (Xenopus and Silurana) and three species groups within the subgenus Xenopus (amieti, laevis, and muelleri species groups).
Abstract: African clawed frogs, genus Xenopus, are extraordinary among vertebrates in the diversity of their polyploid species and the high number of independent polyploidization events that occurred during their diversification. Here we update current understanding of the evolutionary history of this group and describe six new species from west and central sub-Saharan Africa, including four tetraploids and two dodecaploids. We provide information on molecular variation, morphology, karyotypes, vocalizations, and estimated geographic ranges, which support the distinctiveness of these new species. We resurrect Xenopus calcaratus from synonymy of Xenopus tropicalis and refer populations from Bioko Island and coastal Cameroon (near Mt. Cameroon) to this species. To facilitate comparisons to the new species, we also provide comments on the type specimens, morphology, and distributions of X. epitropicalis, X. tropicalis, and X. fraseri. This includes significantly restricted application of the names X. fraseri and X. epitropicalis, the first of which we argue is known definitively only from type specimens and possibly one other specimen. Inferring the evolutionary histories of these new species allows refinement of species groups within Xenopus and leads to our recognition of two subgenera (Xenopus and Silurana) and three species groups within the subgenus Xenopus (amieti, laevis, and muelleri species groups).

76 citations

Journal ArticleDOI
TL;DR: Parsimony analyses of 23 Oidiodendron strains showed that three highly supported monophyletic groups are resolved within the genus and a low level of sequence divergence between the species in these pairs suggests conspe- cificity for each pair.
Abstract: Nuclear ribosomal DNA sequences (ITS region) of fifteen species in the hyphomycete genus Oidiodendron and ten species from the 4 genera in the Myxotrichaceae, Byssoascus, Gymnostellatospora, Myxotrichum, and Pseudogymnoascus, were analysed to: (i) reveal the levels of intra- versus interspecific sequence variation within the genus Oidiodendron, clarify species delimitation and examine the useful- ness of some morphological characters used for iden- tification; (ii) assess the possible conspecificity of doc- umented ericoid mycorrhizal strains of Oidiodendron; and (iii) test the hypothesis based on morphological inference that the genus Oidiodendron belongs with the genus Myxotrichum in the Myxotrichaceae (Ony- genales). Comparison of molecular and morpholog- ical data for multiple strains of 0. griseum, 0. tenuis- simum and 0. maius revealed that conidiophore length and the production of a diffusing pigment are not reliable key characters for the genus. Several his- torically important ericoid mycorrhizal strains, doc- umented as 0. griseum, were reidentified as 0. maius. Parsimony analyses of 23 Oidiodendron strains showed that three highly supported monophyletic groups, each one consisting of a pair of species, are resolved within the genus. A low level of sequence divergence between the species in these pairs suggests conspe- cificity for each pair. Other interspecific relationships were not well-supported by bootstrap values. Parsi- mony analysis of a second dataset composed of mi- totic and meiotic taxa showed that Oidiodendron, My- xotrichum and Byssoascus form a well-supported monophyletic group within the Myxotrichaceae, and

76 citations


Network Information
Related Topics (5)
Systematics
7.8K papers, 211.9K citations
91% related
Monophyly
11.4K papers, 465.5K citations
90% related
Endemism
7.8K papers, 201.5K citations
89% related
Sister group
4.4K papers, 210.2K citations
88% related
Molecular phylogenetics
6.5K papers, 262.4K citations
88% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20232,790
20226,199
20212,431
20202,299
20192,015
20182,000