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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: The phylogeny and evolutionary history of the water scavenger beetles (Coleoptera: Hydrophilidae) are inferred from comprehensive analyses of DNA sequence data from the mitochondrial genes COI, COII and 16S and the nuclear genes 18S, 28S and arginine kinase, suggesting that the smaller subfamilies are derived from within the larger hydrophilinae.
Abstract: The phylogeny and evolutionary history of the water scavenger beetles (Coleoptera: Hydrophilidae) are inferred from comprehensive analyses of DNA sequence data from the mitochondrial genes COI, COII and 16S and the nuclear genes 18S, 28S and arginine kinase. Bayesian and maximum parsimony analyses included 151 taxa, representing all subfamilies, tribes and subtribes that have ever been proposed in the family, as well as representatives of the hydrophiloid families Helophoridae, Hydrochidae, Spercheidae, Epimetopidae and Georissidae. The resulting well-supported trees strongly disagree with prior classifications of the Hydrophilidae, suggesting that the smaller subfamilies (Horelophinae, Horelophopsinae and Sphaeridiinae) are derived from within the larger Hydrophilinae. The existing tribal classification is more compatible with our results, but many significant differences are evident. Here, we present a new classification of the Hydrophilidae comprising 6 subfamilies and 12 tribes. Each subfamily and tribe is reviewed in detail with (i) a morphological diagnosis, including known or putative morphological synapomorphies, (ii) its taxonomic circumscription, including genera not included in our analyses, and (iii) a review of its general biology and geographic distribution. A new identification key to subfamily and tribe based on adult morphology is also provided. The newly adopted classification requires the following taxonomic changes: the subfamily Hydrophilinae sensu n. is redefined to include only the tribes Amphiopini stat.n. (removed from the synonymy with the Chaetarthriini), Berosini, Laccobiini, Hydrophilini and Hydrobiusini (= Sperchopsini syn.n.); the subfamily Chaetarthriinae stat.n. is removed from synonymy with the Hydrophilinae and includes the tribes Chaetarthriini and Anacaenini (= Horelophinae syn.n.); the Acidocerinae stat.n. (= Horelophopsinae syn.n.) and Rygmodinae stat.n. (= Andotypini syn.n., Borborophorini syn.n. and Tormissini syn.n.) are elevated to subfamily rank; and the subfamily Enochrinae subfam.n. is established for the genus Enochrus and its relatives. The implications for the morphological evolution, ecological transitions and biogeography of the family are discussed.

135 citations

Journal ArticleDOI
01 Sep 1964
TL;DR: A reclassification of the genera of Batagurinae and Emydinae is presented: the classification is based mainly on skull characters.
Abstract: On the basis of presence or absence of a muscular apophysis of the basisphenoid in the floor of the recessus scalae tympani, contact of the angular bone with Mackel's cartilage, nature of the joint between the fifth and sixth cervical centra, and pygal pattern, the testudinid subfamily Emydinae as currently recognized may be divided into two subfamilies, the Batagurinae and the Emydinse. The Batagurinae are almost entirely Old-World, but have one New-World genus, Rhinoclemys (the New-World turtles generally referred to Geoemyda). The Emydinae are almost entirely New-World, with a single Old-World genus, Emys. The genus Clemmys is emydine and entirely North American: the Old-World species usually referred to Clemmys are batagurines and are here referredto two genera: Mauremys Gray for caspica, japonica and mutica [-nigrieans of most authors most of the time], and Sacalia Grey for bealei. A reclassification of the genera of Batagurinae and Emydinae is presented: the classification is based mainly on skull characters. Annamemys and Pseudocadia are considered synonyms of Mauremys mutica.

134 citations

Journal ArticleDOI
TL;DR: Core-genome-based phylogenetic reconstructions placed the novel species well separated from all hitherto-described species of the genus Brucella, forming a long-branched sister clade to the classical species of Bru cella.
Abstract: Two slow-growing, Gram-negative, non-motile, non-spore-forming, coccoid bacteria (strains F60T and F965), isolated in Austria from mandibular lymph nodes of two red foxes (Vulpes vulpes), were subjected to a polyphasic taxonomic analysis. In a recent study, both isolates were assigned to the genus Brucella but could not be attributed to any of the existing species. Hence, we have analysed both strains in further detail to determine their exact taxonomic position and genetic relatedness to other members of the genus Brucella. The genome sizes of F60T and F965 were 3 236 779 and 3 237 765 bp, respectively. Each genome consisted of two chromosomes, with a DNA G+C content of 57.2 %. A genome-to-genome distance of >80 %, an average nucleotide identity (ANI) of 97 % and an average amino acid identity (AAI) of 98 % compared with the type species Brucella melitensis confirmed affiliation to the genus. Remarkably, 5 % of the entire genetic information of both strains was of non-Brucella origin, including as-yet uncharacterized bacteriophages and insertion sequences as well as ABC transporters and other genes of metabolic function from various soil-living bacteria. Core-genome-based phylogenetic reconstructions placed the novel species well separated from all hitherto-described species of the genus Brucella, forming a long-branched sister clade to the classical species of Brucella. In summary, based on phenotypic and molecular data, we conclude that strains F60T and F965 are members of a novel species of the genus Brucella, for which the name Brucella vulpis sp. nov. is proposed, with the type strain F60T ( = BCCN 09-2T = DSM 101715T).

134 citations

Book
01 Jan 2007
TL;DR: A comprehensive work covering the about 100,000 species of Coleoptera known to occur in the Palaearctic Region, the complete work is planned for 8 volumes that will be published in intervals of about 18 months.
Abstract: A comprehensive work covering the about 100,000 species of Coleoptera known to occur in the Palaearctic Region. The complete work is planned for 8 volumes that will be published in intervals of about 18 months. The information provided for each species will be the following: * Primary taxonomic information of all available names in the genus and species levels published by the end of 1999. * The taxonomic information below subfamily will be organized alphabetically. * The type species of genera and subgenera, incl. synonyms, are given. * The area covered also includes the Arabian Peninsula, Himalayas and China. * The distributional data of species and subspecies is given per country. * Detailed distributional information for strict endemics is given. * Introduced species are indicated. The catalogue is a collective work of about one hundred coleopterists from Europe, Japan, America and Australia.

133 citations

Journal ArticleDOI
TL;DR: Phylogenetic relationships among russuloid basidiomycetes were investigated using sequence data from the nuclear 5.8S, ITS2 and large-subunit rDNA genes and results suggest that gloeocystidia are a synapomorphy for taxa within the rRussuloid clade while the amyloidity of spores is inconsistent.
Abstract: Many homobasidiomycetes are characterized by a combination of gloeocystidia and amyloid basidiospores. They display a great variation in basidioma morphology, including erect and effused forms and gilled and nongilled forms. Earlier studies have shown these taxa to be related, and the group has been named the russuloid clade. Phylogenetic relationships among russuloid basidiomycetes were investigated using sequence data from the nuclear 5.8S, ITS2 and large-subunit rDNA genes. A dataset including 127 ingroup sequences representing 43 genera and ca 120 species were analyzed by maximum-parsimony and neighbor-joining methods. The sampling of taxa had an emphasis on nongilled taxa and two-thirds of the species possessed corticioid basidiomata. Thirteen major well-supported clades were identified within the russuloid clade. All clades except one include corticioid species. Ten characters from basidioma morphology and cultured mycelium were observed and evaluated. Results suggest that gloeocystidia are a synapomorphy for taxa within the russuloid clade while the amyloidity of spores is inconsistent. The ornamentation of spores and type of nuclear behavior seems to be informative characters at genus level. The agaricoid genera Lactarius and Russula are nested in a clade with corticioid species at the basal position. The new combinations Boidinia aculeata, Gloeodontia subasperispora, Gloeocystidiopsis cryptacantha and Megalocystidium wakullum are proposed.

133 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