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).
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01 Jan 1909
131 citations
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01 Jan 2004
131 citations
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131 citations
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TL;DR: Wilson et al. as discussed by the authors described Pheidole in the New World: A Dominant, Hyperdiverse Ant Genus Harvard University Press, Cambridge, 794 p + CD ROM. Price US$110.00.
Abstract: Rev. Biol. Trop. (Int. J. Trop. Biol. ISSN-0034-7744) Vol. 53 (1-2): 297-304, March-June 2005 (www.tropiweb.com) Wilson, E.O. 2003 Pheidole in the New World: A Dominant, Hyperdiverse Ant Genus Harvard University Press, Cambridge, 794 p + CD ROM. ISBN 0-674-00293. Price US$110.00. Review with a special emphasis on the Brazilian Pheidole ant fauna and megadiversity distribution in American countries
131 citations
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TL;DR: This study led to a new understanding of the evolution of morphology within the genus Chlorella and to an emendation of the generic description.
Abstract: After the description of Chlorella vulgaris by Beijerinck, 120 years ago, members of the genus Chlorella belong to the best studied green algae worldwide. However, numerous open questions remained regarding their systematics. Recent molecular studies showed the polyphyly of the genus within the Chlorophyceae and Trebouxiophyceae. Chlorella-species were traditionally characterized by spherical to oval cell shape, solitary lifeform and the absence of mucilaginous envelopes. The challenge in the past was how to distinguish species due to their high phylogenetic diversity combined with a limited amount of morphological characters. Using a polyphasic approach of SSU- and ITS rDNA phylogeny, secondary structure of the ITS and light microscopic observations, we were able to detect six lineages with Dictyosphaerium-like strains in close relationship to C. vulgaris, here described or combined newly as C. coloniales sp. nov., C. pituita sp. nov., C. pulchelloides sp. nov., C. singularis sp. nov., C. elongata comb. nov. and C. chlorelloides comb. nov. Furthermore, three new species without mucilage were described as C. lewinii sp. nov., C. rotunda sp. nov. and C. volutis sp. nov. Using the 5.8S rRNA and part of the ITS-2 as molecular signature (barcode), we were able to distinguish not only the five already known species of Chlorella, C. vulgaris, C. sorokiniana, C. heliozoae, C. lobophora and C. variabilis but the seven new species and two new combinations as well. CBCs and hemi-CBCs within the secondary structure of the ITS-2 confirmed the separation of the species. Our study led to a new understanding of the evolution of morphology within the genus Chlorella and to an emendation of the generic description.
130 citations