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 published on a yearly basis
Papers
More filters
01 Jan 1975
TL;DR: The 26 New World species of Gnaphosa are diagnosed, described, and assigned to species groups and the genera Callilepis Westring and Laronia Simon are removed from the Gnaphosinae.
Abstract: The 26 New World species of Gnaphosa are diagnosed, described, and assigned to species groups. The genus Cylphosa Chamberlin is considered a junior synonym of Gnaphosa; the genera Callilepis Westring and Laronia Simon are removed from the Gnaphosinae. Nine new species are described: snohomish from Washington; maritima, saxosa, dentata, and salsa from the southwestern United States; and sonora, chihuahua, potosi, and chiapas from Mexico. Seven specific names are newly synonymized: mulaiki Chamberlin and septentrionalis Fox, both with clara (Keyserling); subparvula Fox with mima Chamberlin; gosoga Chamberlin with californica Banks; distincta Banks and texana Chamberlin, both with fontinalis Keyserling; and peon Chamberlin with sericata (L. Koch). The males of utahana Banks, altudona Chamberlin, and sandersi Gertsch and Davis, and the female of orites Chamberlin are described for the first time. The European species microps Holm is newly recorded from America.
73 citations
TL;DR: Clustering patterns based on Bayesian analyses suggested that the polyploid subspecies of A. nummularia have multiple origins, and these findings support the taxonomic separation of the two subspecies.
Abstract: Few studies have described the genetic diversity within and between populations of polyploid plant species despite the general acceptance of the importance of polyploidy in plant diversification and speciation. The genus Atriplex has a complex evolutionary history in Australia that has included polyploidy and hybridization among perennial forms. The octoploid, dioecious species Atriplex nummularia is proposed to have evolved from an octoploid ancestor in the coastal semi-arid fringe of south-western Australia, and to have spread east and diversified into taxa which occupy edaphically different habitats. Despite interest in the diversification of the genus, and the ecological and economic importance of A. nummularia, there are no descriptions of the genetic structure of the species. Nuclear microsatellite markers and principal coordinate analysis, analysis of molecular variance, Bayesian and phenetic analyses were used to investigate the diversity and taxonomic relationships of two common subspecies of A. nummularia. Genetic diversity was high overall (A = 509, A′ = 42.4, Ho = 0.824, H′ = 2.8), but values were significantly lower in the western subspecies, A. nummularia ssp. spathulata. As in other outbreeding, perennial species, most of the genetic diversity was within populations (FST = 0.125). Clear divergence of subspecies was evident in principal coordinate analysis, neighbor-joining and Bayesian clustering analyses and the differentiation of populations was very low within subspecies (FSC = 0.048). These findings support the taxonomic separation of the two subspecies. Clustering patterns based on Bayesian analyses suggested that the polyploid subspecies of A. nummularia have multiple origins. © 2011 The Linnean Society of London, Biological Journal of the Linnean Society, 2012, 105, 218–230.
73 citations
TL;DR: The data support an origin for pythons outside Australia, followed by a radiation into Australia during the mid-Tertiary, and strong support for elevated speciation rates during the period when Australia collided with the proto-Indonesian archipelago.
Abstract: We used nucleotide sequences from four mitochondrial genes and structural features of the mitochondrial control region, combined with a revised, previously published, morphological data set to infer phylogenetic relationships among the pythons. We aimed to determine which of two competing hypotheses of relationships of the genera Aspidites and Python best explains the evolutionary and bioegeographical history of the family. All analyses of the combined data recover a set of relationships in which (1) the genus Python is paraphyletic with the two east Asian species, P. reticulatus and P. timoriensis, as the sister lineage to the seven Australo-Papuan python genera. We support recognition of a distinct genus for the P. reticulatus + P. timoriensis clade; (2) the remaining species of the genus Python form a clade which is the sister lineage to the remainder of the family; (3) the genus Aspidites is embedded among the Australo-Papuan genera. The seemingly primitive characteristics of Aspidites may be better interpreted as reversals or specializations that have accompanied a switch to burrowing in this genus. Resolution of the relationships among the Australo-Papuan lineages is weak, possibly because of rapid diversification early in the history of the radiation. We assessed the tempo of the Indo-Australian python radiation using a maximum likelihood framework based on the birth‐death process. We find strong support for elevated speciation rates during the period when Australia collided with the proto-Indonesian archipelago. The data support an origin for pythons outside Australia, followed by a radiation into Australia during the mid-Tertiary. © 2008 The Linnean Society of London, Biological Journal of the Linnean Society, 2008, 93, 603‐619.
73 citations
TL;DR: The aim of this study was the identification of well-supported clades that provide the basis for evolutionary and taxonomic conclusions and the combination of different data sets allows a comprehensive reconstruction of taxa and characteristic evolution, both of which are a precondition for future revision.
73 citations
TL;DR: Fifteen species, including seven new species, belonging to the genus Prionospio are described, and several are retained, and new species and new synonymies are proposed.
73 citations