scholarly journals Classification of the Leguminosae-Papilionoideae: A Numerical Re-assessment

2013 ◽  
Vol 5 (4) ◽  
pp. 499-507 ◽  
Author(s):  
Adel EL-GAZZAR ◽  
Monier EL-GHANI ◽  
Nahed EL-HUSSEINI ◽  
Adel KHATTAB
Keyword(s):  
Cluster Analysis ◽  
Distance Measure ◽  
Morphological Characters ◽  
Data Matrix ◽  
Clustering Method ◽  
Lower Rank ◽  
Phylogenetic Studies

The subdivision of the Leguminosae-Papilionoideae into taxa of lower rank was subject for major discrepancies between traditional classifications while more recent phylogenetic studies provided no decisive answer to this problem. As a contribution towards resolving this situation, 81 morphological characters were recorded comparatively for 226 species and infra-specific taxa belonging to 75 genera representing 21 of the 32 tribes currently recognized in this subfamily. The data matrix was subjected to cluster analysis using the Sørensen distance measure and Ward’s clustering method of the PC-ord version-5 package of programs for Windows. This combination was selected from among the 56 combinations available in this package because it produced the taxonomically most feasible arrangement of the genera and species. The 75 genera are divided into two main groups A and B, whose recognition requires little more than the re-alignment of a few genera to resemble tribes 1-18 (Sophoreae to Hedysareae) and tribes 19-32 (Loteae to Genisteae), respectively, in the currently accepted classification. Only six of the 21 tribes represented by two or more genera seem sufficiently robust as the genera representing each of them hold together in only one of the two major groups A and B. Of the 29 genera represented by more than one species each 17, 7 and 5 are taxonomically coherent, nearly coherent and incoherent, respectively. The currently accepted circumscription and inter-relationships among the disrupted tribes and genera are in need of much detailed investigation.

scholarly journals Taxonomic Significance of Glume Morphology and Leaf Epidermal Characteristics in some Taxa of Tribe Aveneae (Poaceae)

2013 ◽  
Vol 5 (2) ◽  
pp. 144-155 ◽  
Author(s):  
Adel EL-GAZZAR ◽  
Monier El-GHANI ◽  
Lamiaa SHALABI
Keyword(s):  
Euclidean Distance ◽  
Distance Measure ◽  
Data Matrix ◽  
Numerical Classification ◽  
Taxonomic Significance ◽  
Clustering Method ◽  
Euclidean Distance Measure ◽  
Pca Method ◽  
Silica Skeleton

The numerical classification of tribe Aveneae (Poaceae) is discussed regarding the glume morphology and silica skeleton morphologies. The present study dealt with 18 species belonging to 10 genera of the tribe to cover as many groups as possible within Aveneae. The total of 31 structural characters and 71 character states were scored comparatively. The resulted data matrix was analyzed under a combination of Euclidean distance measure and Ward’s clustering method included in the program package PC-ORD version 5. The resulted dendrogram separated the tribe into five basic sub-ordinate groups created from three major groups A, B and C. The taxonomic significance of these results was discussed. The results showed congruence between the clustering and PCA method, in suggesting three major groups and 5 sub-ordinate groups.

A Global Phylogenomic Study of the Thelypteridaceae

2021 ◽  
Vol 46 (4) ◽  
pp. 891-915
Author(s):  
Susan Fawcett ◽  
Alan R. Smith ◽  
Michael Sundue ◽  
J. Gordon Burleigh ◽  
Emily B. Sessa ◽  
...  
Keyword(s):  
Morphological Characters ◽  
Morphological Evidence ◽  
Phylogenetic Studies ◽  
The Family ◽  
Likelihood Analysis ◽  
Single Genus ◽  
The Subject ◽  
Recent Classification ◽  
Phylogenomic Study

Abstract— The generic classification of the Thelypteridaceae has been the subject of much controversy. Proposed taxonomic systems have varied from recognizing the approximately 1200 species in the family within the single genus Thelypteris, to systems favoring upwards of 30 genera. Insights on intrafamilial relationships, especially for neotropical taxa, have been gained from recent phylogenetic studies; however, in the most recent classification, 10 of 30 recognized genera are either non-monophyletic or untested. We sequenced 407 nuclear loci for 621 samples, representing all recognized genera and approximately half the known species diversity. These were analyzed using both maximum likelihood analysis of a concatenated matrix and multi-species coalescent methods. Our phylogenomic results, informed by recently published morphological evidence, provide the foundation for a generic classification which recircumscribed 14 genera and recognized seven new genera. The 37 monophyletic genera sampled demonstrate greater geographic coherence than previous taxonomic concepts suggested. Additionally, our results demonstrate that certain morphological characters, such as frond division, are evolutionarily labile and are thus inadequate for defining genera.

Taxonomic status of Andersen’s fruit-eating bat (Artibeus jamaicensis aequatorialis) and revised classification of Artibeus (Chiroptera: Phyllostomidae)

Zootaxa ◽  
2010 ◽  
Vol 2648 (1) ◽  
pp. 45 ◽  
Author(s):  
PETER A. LARSEN ◽  
MARÍA R. MARCHÁN-RIVADENEIRA ◽  
ROBERT J. BAKER
Keyword(s):  
Taxonomic Status ◽  
Morphological Characters ◽  
Species Level ◽  
South American ◽  
Reciprocal Monophyly ◽  
Dna Variation ◽  
The Andes ◽  
Artibeus Jamaicensis ◽  
Phylogenetic Studies

Fruit-eating bats of the genus Artibeus are widely distributed across the Neotropics and are one of the most recently evolved assemblages of the family Phyllostomidae. Although the taxonomy and systematics of species of Artibeus has been the subject of an intense historical debate, the most current taxonomic arrangements recognize approximately eleven species within the genus. However, recent phylogenetic studies indicate that species diversity within South and Middle American populations of Artibeus is underestimated. South American populations referable to A. jamaicensis aequatorialis are of considerable interest because previous studies of mitochondrial DNA variation identified potential species level variation west of the Andes Mountains. In this study we use morphometric and genetic data (nuclear AFLPs) to investigate the taxonomic status of A. j. aequatorialis. Our results indicate that elevating aequatorialis to species level is appropriate based on statistically supported reciprocal monophyly in mitochondrial and nuclear datasets and diagnostic morphological characters. In light of our results, and of those presented elsewhere, we provide a revised classification of the genus.

scholarly journals Phylogeny of Ten Kenyan Plectranthus Species in the Coleus Clade Inferred from Leaf Micromorphology, Rbcl and MatK Genes

2017 ◽  
Vol 2017 ◽  
pp. 1-16
Author(s):  
Fredrick M. Musila ◽  
Catherine W. Lukhoba ◽  
Joseph M. Nguta ◽  
Saifuddin F. Dossaji
Keyword(s):  
Cluster Analysis ◽  
Molecular Data ◽  
Gene Sequences ◽  
Plant Identification ◽  
Clear Cut ◽  
Species Phylogeny ◽  
Phylogenetic Studies ◽  
Leaf Micromorphology ◽  
Micromorphological Characters

Plectranthus species are difficult to taxonomically delimit due to lack of clear-cut morphological synapomorphies. This study is aimed at bringing insights into classification of ten Plectranthus species in the Coleus clade by using leaf micromorphology and molecular data. Stomatal counts and observation of microtome leaf sections generated leaf micromorphology data, while molecular data was obtained from sequencing MatK and Rbcl genes from each species. Phylogeny based on the MatK and Rbcl gene sequences clustered four species P. caninus, P. otostegioides, P. barbatus, and P. lanuginosus together (Clusters A and D, respectively), while P. pseudomarrubioides, P. ornatus, and P. aegyptiacus were grouped together into Clusters B and E, respectively, and P. montanus and P. amboinicus were grouped together (Cluster C). A dendrogram was generated through a cluster analysis of the leaf micromorphological characters grouped together, P. caninus, P. ornatus, P. otostegioides, P. montanus, and P. pseudomarrubioides (Cluster F). The dendrogram also grouped together P. aegyptiacus, P. amboinicus, P. edulis, P. barbatus, and P. lanuginosus (Cluster G). The present study has grouped the ten studied Plectranthus species using molecular and leaf micromorphology characters into phylogenies, which are supported by previous studies, and proved that these characters can aid in plant identification and phylogenetic studies.

scholarly journals Classification of Countries According to their Tourism Statistics via Different Cluster Analysis Methods and the Place of Turkey in this Structure

2013 ◽  
Author(s):  
Selay Giray
Keyword(s):  
Cluster Analysis ◽  
Hong Kong ◽  
Russian Federation ◽  
Fuzzy Clustering ◽  
Clustering Methods ◽  
Clustering Method ◽  
Analysis Methods ◽  
Fuzzy Clustering Method ◽  
The World

The aim of this study is to classify the countries according to their tourism indicators via different cluster analysis methods and compare the findings. Using classical cluster analysis and fuzzy clustering together will be more appropriate to determine the World tourism structure. In this way the findings can be interpreted more detailed and comparatively. Data obtained from website of Worldbank (3 basic international tourism statistics of 159 countries for the year 2010) and findings are gained using NCSS (statistical software) 2007. According to the findings of fuzzy clustering method, Turkey belogs to a cluster which contains ABD, United Kingdom, China, Austria, France, Germany, Italy, Malaysia, Spain, Hong Kong, Russian Federation, and Ukraine. According to the findings of classical clustering method (k means), Turkey is in the same cluster with same countries except Hong Kong. Also the findings of two techniques are similar about Turkey. Such a result can be expected correspondingly grading the countries about international their tourism data in 2011. Different clustering methods findings are steady about Euroasian countries too. Except Russian Federation and Ukraine all of the other Euroasian countries are located together in same cluster depending upon two different clustering methods. In conclusion two different clustering methods provide consistent (similar) results about the classification of countries according their internatianol tourism statistics.

scholarly journals Phylogeny of the stink bug tribe Chlorocorini (Heteroptera, Pentatomidae) based on DNA and morphological data: the evolution of key phenotypic traits

2020 ◽  
Author(s):  
Bruno C. Genevcius ◽  
Caroline Greve ◽  
Samantha Koehler ◽  
Rebecca B. Simmons ◽  
David A. Rider ◽  
...  
Keyword(s):  
Morphological Characters ◽  
Molecular Data ◽  
Predatory Behavior ◽  
Morphological Data ◽  
Phylogenetic Study ◽  
Phenotypic Traits ◽  
Stink Bug ◽  
Phylogenetic Studies ◽  
The Family

ABSTRACTPentatomidae is the third largest family of true bugs, comprising over 40 tribes. Few tribes have been studied in a phylogenetic context, and none of them have been examined using molecular data. Moreover, little is known about the evolution of key morphological characters widely used in taxonomic and phylogenetic studies at multiple levels. Here, we conduct a phylogenetic study of the tribe Chlorocorini (Pentatominae) combining 69 morphological characters and five DNA loci. We use the inferred phylogeny to reconstruct the evolution of key morphological characters such as the spined humeral angles of the pronotum, a dorsal projection on the apices of the femora and characters of male genitalia. We provide solid evidence that the tribe as currently recognized is not monophyletic based both on DNA and morphological data. The genera Arvelius Spinola and Eludocoris Thomas were consistently placed outside of the Chlorocorini, while the remaining genera were found to form a monophyletic group. We also show that nearly all morphological diagnostic characters for the tribe are homoplastic. The only exception is the development of the hypandrium, which, contrary to expectations for genital traits, showed the slowest evolutionary rates. In contrast, the most rapidly evolving trait is the length of the ostiolar ruga, which may be attributed to selection favoring anti-predatory behavior and other functions of its associated scent glands. Lastly, we also provide a preliminary glimpse of the main phylogenetic relationships within the Pentatomidae, which indicates that most of the included subfamilies and tribes are not monophyletic. Our results suggest that the current subfamily-level classification of Pentatomidae is not adequate to reflect its evolutionary history, and we urge for a more complete phylogeny of the family.

Use of cluster analysis for classification of Benchmark soil samples from India in different micronutrient availability groups

1985 ◽  
Vol 104 (2) ◽  
pp. 421-424 ◽  
Author(s):  
J. C. Katyal ◽  
S. P. Doshi ◽  
P. K. Malhotra
Keyword(s):  
Cluster Analysis ◽  
Discriminant Analysis ◽  
Distance Matrix ◽  
Data Matrix ◽  
Micronutrient Deficiencies ◽  
Usual Practice ◽  
Diethylene Triamine ◽  
Micronutrient Availability ◽  
Semi Arid

SummaryIn view of the increase in micronutrient deficiencies in crop plants, ans attempt is made to group 57 Benchmark Indian soils into different micronutrient availability classes (clusters) vis-à-vis some soil characteristics. Since most of the soil characters are expressed in proportions or percentages (a usual practice in soil studies), the data matrix was transformed into log10 values to bring it nearer to normality. The transformed data matrix was used for cluster analysis and subsequently also for discriminant analysis. By following the method of Euclidean cluster analysis, the 57 Benchmark soils could be subdivided into three clusters. The distinctness of clusters was proven by distance-matrix as well as discriminant analysis. All the soils of cluster I and II originated from arid and semi-arid climates and these were alkaline in reaction, low in organic carbon (OC) and high in total lime. On the contrary, cluster III comprised all but a few soils from humid-subhumid regions. These soils were acidic in reaction and relatively high in OC and total lime. The soils of cluster I and II were poorer in diethylene triamine penta-acetic acid (DTPA) extractable micronutrient cations than those of cluster III. This study thus reveals that it is possible to classify diverse soils by statistical means into distinct clusters based upon micronutrient availability and associated soil properties. Furthermore, it suggests that soils of arid and semi-arid climates as a group, because of their low micronutrient availability, are expected to be more prone to deficiencies than those of humid and subhumid zones.

A cladistic analysis and reclassification of the tribe Bembicini (Hymenoptera: Crabronidae: Bembicinae)

Zootaxa ◽  
2011 ◽  
Vol 2801 (1) ◽  
pp. 27 ◽  
Author(s):  
PAVEL G. NEMKOV ◽  
MICHAEL OHL
Keyword(s):  
Cladistic Analysis ◽  
Morphological Characters ◽  
Identification Key ◽  
Data Matrix ◽  
Consensus Tree ◽  
Strict Consensus Tree ◽  
Digger Wasp ◽  
Genus Level

A cladistic analysis of the digger wasp tribe Bembicini based on morphological characters is presented. The underlying data matrix comprises 64 terminal taxa (coded on genus-level) and 54 morphological characters. The resulting strict consensus tree was used as the basis for a revised subtribal classification of the Bembicini. Based on a previously published classification, we herewith propose a number of changes. The subtribe Spheciina Nemkov and Ohl, subtrib. nov. (comprising Ammatomus A. Costa 1859, Kohlia Handlirsch 1895, Sphecius Dahlbom 1843, and Tanyoprymnus Cameron 1905) is removed from Handlirschiina Nemkov and Lelej 1996. The subtribe Stictiellina Bohart and Horning 1971, stat. resurr. (composed of Chilostictia Gillaspy 1983, Glenostictia Gillaspy in Gillaspy, Evans, and Lin 1962, Microstictia Gillaspy 1963, Steniolia Say 1837, Stictiella J. Parker 1917, and Xerostictia Gillaspy 1963) is separated from Bembicina Latreille 1802. The subtribe Argogorytina Nemkov and Lelej 1996 (Argogorytes Ashmead 1899, Neogorytes Bohart in Bohart and Menke 1976, Paraphilanthus Vardy 1995) is synonymized with Exeirina Dalla Torre 1897, syn. nov. Finally, the subtribe Trichogorytina Nemkov and Pulawski 2009 (genus Trichogorytes Rohwer 1912 only) is synonymized with Gorytina Lepeletier de Saint Fargeau 1845, syn. nov. An updated identification key to the subtribes of the Bembicini is provided.

scholarly journals Molecular phylogeny and historical biogeography of andrenine bees (Hymenoptera: Andrenidae)

2020 ◽  
Author(s):  
Gideon Pisanty ◽  
Robin Richter ◽  
Teresa Martin ◽  
Jeremy Dettman ◽  
Sophie Cardinal
Keyword(s):  
New World ◽  
Morphological Character ◽  
Eastern Mediterranean ◽  
Morphological Characters ◽  
List Type ◽  
Early Oligocene ◽  
Phylogenetic Studies ◽  
Molecular Phylogenetic ◽  
Dispersal Events

AbstractThe mining bee subfamily Andreninae (Hymenoptera: Andrenidae) is a widely distributed and diverse group of ground-nesting solitary bees, including numerous species known as important pollinators. Most of the species diversity of Andreninae is concentrated in the mainly Holarctic genus Andrena, comprising ca. 1500 described species. The subfamily and especially the genus have remained relatively neglected by recent molecular phylogenetic studies, with current classifications relying largely on morphological characters. We sampled ultraconserved element (UCE) sequences from 235 taxa, including all andrenine genera and 98 out of 104 currently recognized Andrena subgenera. Using 419,858 aligned nucleotide sites from 1009 UCE loci, we present a comprehensive molecular phylogenetic analysis of the subfamily. Our analysis supports the recognition of seven distinct genera in the Andreninae: Alocandrena, Ancylandrena, Andrena, Cubiandrena, Euherbstia, Megandrena, and Orphana. Within the genus Andrena, present-day subgeneric concepts revealed high degrees of paraphyly and polyphyly, due to heavy morphological character homoplasy, necessitating a thorough, extensive revision of the higher classification of the genus. Our results also show that the MRCA of Andrena+Cubiandrena dispersed from the New World to the Palaearctic probably during the Eocene– early Oligocene, followed by 10–14 Neogene dispersal events from the Palaearctic to the Nearctic and 1–6 Neogene dispersals back into the Palaearctic, all within the genus Andrena.HighlightsA phylogeny is presented for the bee subfamily Andreninae based on UCE sequencesThe Eastern Mediterranean subgenus Cubiandrena is sister to all remaining AndrenaMany Andrena subgenera exhibit paraphyly or polyphyly, requiring recircumscriptionAt least 11 Old World–New World exchange events have occurred within Andrena

Neurophysiologic classification of Wilson's disease by using cluster analysis

2006 ◽  
Vol 37 (01) ◽  
Author(s):  
W Hermann ◽  
T Villmann ◽  
HJ Kühn ◽  
P Baum ◽  
G Reichel ◽  
...  
Keyword(s):  
Cluster Analysis ◽  
Wilson’S Disease ◽  
Wilson's Disease
Sign in / Sign up

Export Citation Format

Share Document