The Experts below are selected from a list of 318 Experts worldwide ranked by ideXlab platform
A G Papeschi - One of the best experts on this subject based on the ideXlab platform.
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meiotic studies in largus rufipennis castelnau largidae Heteroptera ii reciprocal translocation heterozygosity
Caryologia, 1998Co-Authors: Maria Jose Bressa, A G Papeschi, L M Mola, Marcelo Luis LarramendyAbstract:SUMMARYSpecimens of Largus rufipennis (Castelnau) (Largidae, Heteroptera) from three different populations from Argentina (Itaembe, Misiones Province; Tornquist and Ciudad Universitaria, Buenos Aires Province) were cytogenetically studied. Meiotic characteristics of these populations are compared with previous reports on the species. In the population from Itaembe, heterozygosity for a reciprocal translocation was encountered; this finding is the first report for this type of chromosome rearrangement in the order Heteroptera. The role of reciprocal translocations in karyotype evolution in organisms with holokinetic chromosomes is analyzed and discussed.
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meiotic studies in largus rufipennis castelnau largidae Heteroptera frequency and behaviour of ring bivalents univalents and b chromosomes
Heredity, 1993Co-Authors: L M Mola, A G PapeschiAbstract:Meiotic studies in Largus rufipennis (Castelnau) (Largidae, Heteroptera): frequency and behaviour of ring bivalents, univalents and B chromosomes
Dan A Polhemus - One of the best experts on this subject based on the ideXlab platform.
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global diversity of true bugs Heteroptera insecta in freshwater
Hydrobiologia, 2008Co-Authors: John T. Polhemus, Dan A PolhemusAbstract:The aquatic and semi-aquatic Heteroptera, consisting of the infraorders Leptopodomorpha, Gerromorpha, and Nepomorpha, comprise a signifi- cant component of the world’s aquatic insect biota. Within these three infraorders as a whole there are currently 23 families, 343 genera and 4,810 species group taxa considered valid, of which 20 families, 326 genera and 4,656 species inhabit freshwater. In addition, more than 1,100 unequivocally diagnosed species remain to be described. Aquatic Heteroptera occur on all continents except Antarctica, and are most numerous in the tropical regions, although there are many distinctly cold-adapted genera. Overall species richness is highest in the Neotropical and Oriental regions, which harbor 1,289 and 1,103 species, respectively. In comparison to these core tropical regions, species richness is significantly lower in the Afrotropical (799 species), Australasian (654 species), Palearctic (496 species), Nearctic (424 species) and Pacific (37 species) regions. Aquatic Heteroptera are notable for utilizing an exceptionally broad range of habitats, from marine and intertidal to arctic and high alpine, across a global altitudinal range of 0–4,700 m. Species may be found in almost every freshwater biotope, and many exhibit striking morphological adaptations to their aquatic environment, making them excellent subjects for ecological and biogeographic studies.
Wolfgang Rabitsch - One of the best experts on this subject based on the ideXlab platform.
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true bugs hemiptera Heteroptera chapter 9 1
BioRisk, 2010Co-Authors: Wolfgang RabitschAbstract:Th e inventory of the alien Heteroptera of Europe includes 16 species alien to Europe, 25 species alien in Europe and 7 cryptogenic species. Th is is approximately 1.7% of the Heteroptera species occurring in Eu- rope. Most species belong to Miridae (20 spp.), Tingidae (8 spp.), and Anthocoridae (7 spp.). Th e rate of introductions has exponentially increased within the 20 th century and since 1990 an approximate arrival rate of seven species per decade has been observed. Most of the species alien to Europe are from North America, almost all of the species alien in Europe originate in the Mediterranean region and were translo- cated to central and northern Europe. Most alien Heteroptera species are known from Central and West- ern Europe (Czech Republic, Germany, Netherlands, Great Britain). Ornamental trade and movement as stowaways with transport vehicles are the major pathways for alien Heteroptera. Most alien Heteroptera colonize habitats under strong human infl uence, like agricultural, horticultural, and domestic habitats, parks and gardens. A few species prefer woodland including plantations of non-native forest trees. Im- pacts of alien Heteroptera in Europe are poorly investigated. A few species are considered pests in agricul- ture, forestry, or on ornamentals. More research is needed for a better understanding of the ecological and economic eff ects of introduced Heteroptera.
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alien true bugs of europe insecta hemiptera Heteroptera
Zootaxa, 2008Co-Authors: Wolfgang RabitschAbstract:This paper reviews the alien (non-native, non-indigenous, exotic) true bug (Heteroptera) species in Europe. Forty-two established alien Heteroptera are recognized, of which 12 species are alien to Europe (originating outside Europe: eight from North America, three from the Eastern Palaearctic, one from New Zealand), 24 species are alien within Europe (translocated within Europe), and six cryptogenic species are of unknown origin. Since 1990 an approximate arrival rate of 7 species per decade has been observed. A recent trend of increased introductions from North America to Europe is suggested. The most important pathway of alien Heteroptera is translocation as contaminants (49 %), usually with ornamental plants, followed by unintentional introduction through natural dispersal (unaided) across political borders within Europe (28 %), and translocation as stowaways within a transport vector (21 %). The taxonomic composition of the alien Heteroptera of Europe is dominated by Miridae (17 species, 40 %), Tingidae (8 species, 19 %), and Anthocoridae (5 species, 12 %), all of which are overrepresented compared to the native European Heteroptera fauna. More than half of the species are phytophagous (24 species, 57 %) and the advantage of trophic specialization in invasion success is discussed. Most species are currently known to occur in the Czech Republic (19 species) and Germany (17 species), followed by Western European countries (Belgium 15 sp., France and United Kingdom 14 sp. each, and Netherlands 13 sp.), resulting in an apparent (north)west–(south)east gradient probably reflecting horticultural tradition in Europe. No unambiguous
L M Mola - One of the best experts on this subject based on the ideXlab platform.
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meiotic studies in largus rufipennis castelnau largidae Heteroptera ii reciprocal translocation heterozygosity
Caryologia, 1998Co-Authors: Maria Jose Bressa, A G Papeschi, L M Mola, Marcelo Luis LarramendyAbstract:SUMMARYSpecimens of Largus rufipennis (Castelnau) (Largidae, Heteroptera) from three different populations from Argentina (Itaembe, Misiones Province; Tornquist and Ciudad Universitaria, Buenos Aires Province) were cytogenetically studied. Meiotic characteristics of these populations are compared with previous reports on the species. In the population from Itaembe, heterozygosity for a reciprocal translocation was encountered; this finding is the first report for this type of chromosome rearrangement in the order Heteroptera. The role of reciprocal translocations in karyotype evolution in organisms with holokinetic chromosomes is analyzed and discussed.
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meiotic studies in largus rufipennis castelnau largidae Heteroptera frequency and behaviour of ring bivalents univalents and b chromosomes
Heredity, 1993Co-Authors: L M Mola, A G PapeschiAbstract:Meiotic studies in Largus rufipennis (Castelnau) (Largidae, Heteroptera): frequency and behaviour of ring bivalents, univalents and B chromosomes
Wenjun Bu - One of the best experts on this subject based on the ideXlab platform.
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the complete mitochondrial genome of the stalk eyed bug chauliops fallax scott and the monophyly of malcidae hemiptera Heteroptera
PLOS ONE, 2013Co-Authors: Teng Li, Wenjun BuAbstract:Chauliops fallax Scott, 1874 (Hemiptera: Heteroptera: Malcidae: Chauliopinae) is one of the most destructive insect pests of soybean and rice fields in Asia. Here we sequenced the complete mitochondrial genome of this pest. This genome is 15,739 bp long, with an A+T content of 73.7%, containing 37 typical animal mitochondrial genes and a control region. All genes were arranged in the same order as most of other Heteroptera. A remarkable strand bias was found for all nine protein coding genes (PCGs) encoded by the majority strand were positive AT-skew and negative GC-skew, whereas the reverse were found in the remaining four PCGs encoded by the minority strand and two rRNA genes. The models of secondary structures for the two rRNA genes of sequenced true bugs and Lygaeoidea were predicted. 16S rRNA consisted of six domains (domain III is absent as in other known arthropod mitochondrial genomes) and 45 helices, while three domains and 27 helices for 12S rRNA. The control region consists of five subregions: a microsatellite-like region, a tandem repeats region and other three motifs. The unusual intergenic spacer between tRNA-H and ND4 only found in the species of Lygaeoidea, not in other Heteropteran species, may be the synapomorphy of this superfamily. Phylogenetic analyses were carried out based on all the 13 PCGs showed that Chauliopinae was the sister group of Malcinae and the monophyly of Lygaeoidea.
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higher level phylogeny and the first divergence time estimation of Heteroptera insecta hemiptera based on multiple genes
PLOS ONE, 2012Co-Authors: Min Li, Ying Tian, Ying Zhao, Wenjun BuAbstract:Heteroptera, or true bugs, are the largest, morphologically diverse and economically important group of insects with incomplete metamorphosis. However, the phylogenetic relationships within Heteroptera are still in dispute and most of the previous studies were based on morphological characters or with single gene (partial or whole 18S rDNA). Besides, so far, divergence time estimates for Heteroptera totally rely on the fossil record, while no studies have been performed on molecular divergence rates. Here, for the first time, we used maximum parsimony (MP), maximum likelihood (ML) and Bayesian inference (BI) with multiple genes (18S rDNA, 28S rDNA, 16S rDNA and COI) to estimate phylogenetic relationships among the infraorders, and meanwhile, the Penalized Likelihood (r8s) and Bayesian (BEAST) molecular dating methods were employed to estimate divergence time of higher taxa of this suborder. Major results of the present study included: Nepomorpha was placed as the most basal clade in all six trees (MP trees, ML trees and Bayesian trees of nuclear gene data and four-gene combined data, respectively) with full support values. The sister-group relationship of Cimicomorpha and Pentatomomorpha was also strongly supported. Nepomorpha originated in early Triassic and the other six infraorders originated in a very short period of time in middle Triassic. Cimicomorpha and Pentatomomorpha underwent a radiation at family level in Cretaceous, paralleling the proliferation of the flowering plants. Our results indicated that the higher-group radiations within hemimetabolous Heteroptera were simultaneously with those of holometabolous Coleoptera and Diptera which took place in the Triassic. While the aquatic habitat was colonized by Nepomorpha already in the Triassic, the Gerromorpha independently adapted to the semi-aquatic habitat in the Early Jurassic.
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comparative and phylogenomic studies on the mitochondrial genomes of pentatomomorpha insecta hemiptera Heteroptera
BMC Genomics, 2008Co-Authors: Mingming Li, Pengzhi Dong, Wenjun BuAbstract:Background Nucleotide sequences and the gene arrangements of mitochondrial genomes are effective tools for resolving phylogenetic problems. Hemipteroid insects are known to possess highly reorganized mitochondrial genomes, but in the suborder Heteroptera (Insecta: Hemiptera), there was only one complete mitochondrial genome sequenced without gene rearrangement and the phylogeny of infraorder Pentatomomorpha in Heteroptera was still uncertain.
