A numerical taxonomic study of variation in populations of Typhlodromus caudiglans Schuster (Acarina: Phytoseiidae)

1978 ◽  
Vol 56 (1) ◽  
pp. 55-65 ◽  
Author(s):  
D. A. Chant ◽  
R. I. C. Hansell ◽  
H. Rowell
Keyword(s):  
Host Plants ◽  
Numerical Taxonomy ◽  
Morphological Characters ◽  
The Other ◽  
Climatic Variables ◽  
Taxonomic Study ◽  
Multivariate Tests ◽  
Morphological Variations ◽  
Numerical Taxonomic Study ◽  
Typhlodromus Caudiglans

Variation in morphological characters between Canadian populations of Typhlodromus caudiglans Schuster (Acarina: Phytoseiidae) was examined by the methods of numerical taxonomy. Western populations are separated from the other populations when multivariate tests are used. Two subspecies are proposed, and Typhlodromella nodosus De Leon is synonymized with Typhlodromus caudiglans. Morphological variations between northern and eastern populations are correlated with climatic variables and with host plants.

Description of two new species of Rhamphus related to R. oxyacanthae (Curculionidae, Curculioninae, Rhamphini) from Italy based on a morphological study supported by molecular data

Zootaxa ◽  
2021 ◽  
Vol 4995 (1) ◽  
pp. 111-128
Author(s):  
LUCIANO DIOTTI ◽  
ROBERTO CALDARA ◽  
IVO TOŠEVSKI
Keyword(s):  
New Species ◽  
Morphological Study ◽  
Host Plants ◽  
Molecular Study ◽  
Morphological Characters ◽  
Molecular Data ◽  
Integrative Taxonomy ◽  
The Other ◽  
Distribution Data ◽  
Two New Species

Two new species of the weevil genus Rhamphus from Italy are herein described: R. bavierai n. sp. (Sicily) and R. hampsicora n. sp. (Sardinia). Both are morphologically and from a molecular perspective close to R. oxyacanthae (Marsham, 1802) and R. monzinii Pesarini & Diotti, 2012. Aside from a diagnostic description and a synoptic key, distribution data and notes on the host plants of the four species are reported. Whereas R. monzinii can be distinguished by several morphological characters, the other three species are morphologically very similar to each other and separable only by the combination of a few subtle characters. On the contrary, a preliminary molecular study revealed substantial divergences of mtCOI from 6.2 to 14.9% between the species, confirming the importance of an integrative taxonomy.  

Evolution of European Cockchafers (Melolonthinae: Scarabaeidae: Coleoptera): a morphological, molecular and chromosomal study of intra- and inter-specific variations

2011 ◽  
Vol 101 (3) ◽  
pp. 345-352 ◽  
Author(s):  
T. Giannoulis ◽  
A.-M. Dutrillaux ◽  
Z. Mamuris ◽  
O. Montreuil ◽  
C. Stamatis ◽  
...  
Keyword(s):  
Gene Sequence ◽  
Chromosomal Polymorphism ◽  
Morphological Characters ◽  
The Other ◽  
Ancestral Karyotype ◽  
Intraspecific Polymorphism ◽  
Morphological Variations ◽  
Chromosomal Study ◽  
Sequence Study

AbstractIn cockchafers of the genus Melolontha, there is a marked intraspecific polymorphism for morphological characters, making some specimens of one species resemble another. A cytogenetic and molecular (mitochondrial COI gene sequence) study of typical and atypical forms of M. melolontha and M. hippocastani, captured at the same period and area, was performed. Karyotypes and haplotypes clearly characterize each taxon, placing atypical specimens in one or the other species unambiguously. This formally discards the role of hybridization in phenotypic resemblance, as usually proposed. Karyotypes and haplotypes were compared to those of M. pectoralis and Phyllophaga pleei, a more distantly related Melolonthinae, and some Dynastinae species, to reconstruct their ancestral karyotype. The karyotype of M. melolontha is the most derivative and that of P. pleei the most conserved among the Melolonthinae studied, which fits with the phylogeny established by COI gene analysis. Both karyotypes and COI haplotypes demonstrate the proximity of M. pectoralis and M. melolontha. The karyotype of M. melolontha is polymorphic, without relationship with morphological variations. Finally, the existence of similar morphological variations in different Melolontha species and chromosomal polymorphism in M. melolontha is discussed in relation with a network (reticulated) mode of speciation.

Numerical taxonomic study on Turkish Lathyrus (Leguminoseae)

1992 ◽  
Vol 49 (3) ◽  
pp. 333-341 ◽  
Author(s):  
M. Dogan ◽  
A. Kence ◽  
C. Tigin
Keyword(s):  
Morphological Characters ◽  
Herbarium Specimens ◽  
Taxonomic Study ◽  
Flora Of Turkey ◽  
Numerical Taxonomic Study

This study examines whether a satisfactory classification of Turkish Lathyrus species can be obtained from phenetic clustering based on external vegetative and floral morphological characters of herbarium specimens. Forty morphological characters for each species of the genus Lathyrus L. were scored and the data subjected to numerical taxonomic analyses. The results of this study suggest that there are basically nine sections (Orobus, Lathyrostylis, Aphaca, Nissolia, Orobon, Gorgonia, Clymenum, Cicercula and Lathyrus) which can be grouped under two subgenera, namely subgenus Lathyrus and subgenus Orobus, as far as the material belonging to 54 of the 58 species cited in Flora of Turkey allows. Sect. Gorgonia Dogan is described.

A numerical taxonomic study of the British Phaeophyta

1975 ◽  
Vol 55 (4) ◽  
pp. 763-784 ◽  
Author(s):  
G. Russell ◽  
R. L. Fletcher
Keyword(s):  
Numerical Taxonomy ◽  
Taxonomic Study ◽  
Numerical Techniques ◽  
Marine Algal ◽  
Numerical Taxonomic Study

The principles and aims of numerical taxonomy were clearly stated by Sokal & Sneath (1963) and their procedures have since been adopted by many botanists working with numerous different groups of plants. Marine algal taxonomists, however, seem largely to have ignored these developments although Whitton (1969) has recommended that numerical techniques should be employed to help solve outstanding problems in the taxonomy of the Cyanophyta.

Numerical taxonomy of psychrotrophic bacteria isolated from raw ewes' milk

1993 ◽  
Vol 60 (3) ◽  
pp. 371-383 ◽  
Author(s):  
María-Rosario García-Armesto ◽  
Miguel Prieto ◽  
Carlos Alonso ◽  
María-Luisa GarcíLópez ◽  
María-Camino García-Fernández ◽  
...  
Keyword(s):  
Low Temperature ◽  
Aeromonas Hydrophila ◽  
Numerical Taxonomy ◽  
Taxonomic Study ◽  
Coagulase Negative Staphylococci ◽  
Gram Negative ◽  
Identification Schemes ◽  
Psychrotrophic Bacteria ◽  
Numerical Taxonomic Study ◽  
Reference Strains

SummaryA total of 204 psychrotrophic isolates from raw ewes' milk (hand and machine milked) were identified by conventional methods. In addition, a numerical taxonomic study was conducted on 180 of these isolates and 19 reference strains. Three of the isolates were yeasts. Using identification schemes, 54 isolates were assigned to genera of Gram-negative aerobic rods (Pseudomonas, Acinetobacter, Flavobacterium, MoraxellaandPsychrobacter), 48 were Enterobacteriaceae (Entero-bacter, Hafnia, Klebsiella, CitrobacterandSerratia) and one was identified asAeromonas hydrophila. The 98 Gram-positive isolates were identified asEnterococcus, Streptococcus, Leuconostoc, Lactococcus, Bacillus, Staphylococcus, Micrococcus, Aureobacterium, KurthiaandMicrobacterium. At the 82% similarity level (SSM), 18 clusters were formed. Cluster I included 34 strainsof Lactococcus, StreptococcusandLeuconostoc. Most of the 35 strains in cluster II wereEnterococcus. Clusters III and IV were identified asKurthiaandMicrobacteriumrespectively. Cluster V was identified asAureobacteriumand cluster VI consisted of coagulase-negative staphylococci. Gram-negative isolates formed 12 clusters:Aeromonas(one cluster), Enterobacteriaceae (two clusters),Flavobacterium(two clusters),PseudomonasandPsychrobacter immobilis(three clusters) andAcinetobacter(four clusters). Non-motile variants ofPs. fragiwere found.Enterococcusand Enterobacteriaceae did not have significant spoilage properties. As expected, Gram-negative aerobic rods were proteolytic and/or lipolytic even at low temperature. Contamination with certain types of psychrotrophs (Gram-negative aerobic rods and enterococci) seemed to be associated with the milking method. The isolate ofAes. hydrophilahad properties associated with virulence.

scholarly journals A numerical taxonomic study of the family Zygophyllaceae from Egypt

2012 ◽  
Vol 26 (1) ◽  
pp. 165-180 ◽  
Author(s):  
Kadry N. Abdel khalik
Keyword(s):  
Numerical Analysis ◽  
Systematic Study ◽  
Pollen Grains ◽  
Morphological Characters ◽  
Taxonomic Study ◽  
Peganum Harmala ◽  
Homogeneous Groups ◽  
Factor Loadings ◽  
The Family ◽  
Numerical Taxonomic Study

A systematic study of 29 taxa belonging to 7 genera of subfamilies Balanitoideae, Zygophylloideae, Peganoideae, Tribuloideae, Seetzenioideae and Tetradiclidoideae of Zygophyllaceae from Egypt was carried out by means of numerical analysis based on sixty-one morphological characters, including vegetative parts, pollen grains and seeds. On the basis of UPGMA clustering and PCO analysis, six main groups are recognized. Representatives of these groups are clustered together based on characters with high factor loadings in the PCO analysis. The results indicate that Zygophyllaceae are heterogeneous, including Peganum harmala which has been proposed to belong in a separate family. Zygophylloideae, Tribuloideae, Tetradiclidoideae and Seetzenioideae are the most homogeneous groups. Sections and groups in both Tribulus and Fagonia seem artificial.

scholarly journals Numerical taxonomic study of the genus Crotalaria L. (Crotalarieae, Fabaceae) in Nigeria

2018 ◽  
Vol 50 (1) ◽  
pp. 25-32
Author(s):  
Samaila Samaila Yaradua ◽  
Dhafer Ahmed Alzahrani ◽  
Abubakar Bello
Keyword(s):  
Cluster Analysis ◽  
Multivariate Analysis ◽  
Numerical Taxonomy ◽  
Field Work ◽  
Taxonomic Study ◽  
Cophenetic Correlation ◽  
Euclidian Distance ◽  
Ordination Analysis ◽  
Qualitative Characters ◽  
Numerical Taxonomic Study

Abstract Numerical taxonomic study of the genus Crotalaria L. in Nigeria was conducted to identify and differentiate some of the species of the genus Crotalaria using numerical taxonomy based on quantitative and qualitative characters. Field work was conducted, where different species were collected and analyzed using multivariate analysis. The results showed that all the collected species are distinct at Euclidian distance of 0.41 in the cluster analysis with Cophenetic correlation (r)=0.964. The ordination analysis based on the results of the PCA, separated the specimens into 7 groups corresponding to the result of cluster analysis. The first two components of the PCA account for 81.5%. The length of petiole, width of leaflet and length of fruit contributed more to showing delimitation among the species.

scholarly journals SYSTEMATICAL COMPARATIVE FOR TWO SPECIES AMARANTHUS albus L. AND AMARANTHUS gracilis DEFS. (AMARANTHACEAE) IN IRAQ

2017 ◽  
Vol 48 (3) ◽  
Author(s):  
S. A. Aliwy
Keyword(s):  
Geographical Distribution ◽  
Plant Species ◽  
Morphological Characters ◽  
The Other ◽  
Taxonomic Study ◽  
Flowering Period ◽  
Short Filament

This study dealt with comparative taxonomic study for the two species Amarantus albus L. and Amaranthus gracilis Defs. in Iraq . It was included the important morphological characters for roots, stems, leaves ,petioles ,inflorescences and its parts ,floral parts ,fruits and seeds . Also the dimensions and properties of each part have been recorded ,even its colors which helps in isolated and diagnosed the two species, the first one recognized by its white stems while the other one had red stems, also the first species characterized by axillaries sessile  inflorescences with so small florets  while the other one had terminal clusters spike inflorescence . Stamens were three in first species with short filament while they were 2-3 stamens with long filament in the other one. Also the study determined the rat of the flowering period for the two species as well as the study of ecological and geographical distribution for the two species in Iraq, the results documented with pictures. It could be depended to studied traits of the plant species for classification.  

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