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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
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Journal ArticleDOI
TL;DR: A phylogeny of Bothrops, Bothriopsis, and Bothrocophias is presented based on 85 characters of morphology and 2343 bp of four mitochondrial gene regions, and with significantly greater taxonomic coverage than previous studies.

140 citations

Book
01 Jan 1932

140 citations

Journal ArticleDOI
TL;DR: As powerful and reliable taxonomical tools, and as potential new tools such as pan-genomics have not yet been fully evaluated for taxonomic purposes, it is proposed to use as thresholds, genus by genus, the minimum and maximum similarity values observed among species.
Abstract: Modern bacterial taxonomy is based on a polyphasic approach that combines phenotypic and genotypic characteristics, including 16S rRNA sequence similarity. However, the 95 % (for genus) and 98.7 % (for species) sequence similarity thresholds that are currently recommended to classify bacterial isolates were defined by comparison of a limited number of bacterial species, and may not apply to many genera that contain human-associated species. For each of 158 bacterial genera containing human-associated species, we computed pairwise sequence similarities between all species that have names with standing in nomenclature and then analysed the results, considering as abnormal any similarity value lower than 95 % or greater than 98.7 %. Many of the current bacterial species with validly published names do not respect the 95 and 98.7 % thresholds, with 57.1 % of species exhibiting 16S rRNA gene sequence similarity rates ≥98.7 %, and 60.1 % of genera containing species exhibiting a 16S rRNA gene sequence similarity rate <95 %. In only 17 of the 158 genera studied (10.8 %), all species respected the 95 and 98.7 % thresholds. As we need powerful and reliable taxonomical tools, and as potential new tools such as pan-genomics have not yet been fully evaluated for taxonomic purposes, we propose to use as thresholds, genus by genus, the minimum and maximum similarity values observed among species.

139 citations

Journal ArticleDOI
TL;DR: A comprehensive classification of extant haptophytes is presented in this paper, with full citations of all taxa from species to class level within the division Haptophyta, with particular attention being paid to problems related to recognition of life-cycle associations.
Abstract: A comprehensive classification of extant haptophytes is presented, with full citations of all taxa from species to class level within the division Haptophyta. Almost 100 notes discuss aspects of classification and nomenclature, with particular attention being paid to problems related to recognition of life-cycle associations. One new genus Holococcolithophora is described and six species are recombined in it. Appendices list conserved and rejected names, the type species of genera, and basionyms of recombined species.

138 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20232,790
20226,199
20212,431
20202,299
20192,015
20182,000