scholarly journals New And Neglected Morphological Features in the Taxonomy of Asian Lejeunea (Marchantiophyta)

2014 ◽  
Vol 59 (1) ◽  
pp. 31-36 ◽  
Author(s):  
Gaik Ee Lee ◽  
Ahmad Damanhuri ◽  
Abdul Latiff ◽  
S. Robbert Gradstein
Keyword(s):  
Morphological Feature ◽  
Morphological Characters ◽  
Species Level ◽  
Morphological Features ◽  
Phenetic Analysis ◽  
Infrageneric Classification ◽  
Surface Wax ◽  
Taxonomic Feature ◽  
Large Genus

Abstract The infrageneric classification of the large genus Lejeunea Lib. is poorly understood due to the lack of stable morphological characters characterizing supraspecific groups. Phenetic analysis of 26 morphological features of 31 Asian Lejeunea species separated two main species clusters based on the number of superior central cells at underleaf bases. The number of superior central cells had not previously been utilized in the classification of Lejeunea and appears to be new and stable morphological feature within this genus. The presence of surface wax was confirmed in L. flava (Sw.) Nees and was newly recorded in L. mimula Hürl. and L. tuberculosa Steph. We suggest that wax ornamentation may be a useful taxonomic feature at species level in Lejeunea.

A Study of Correlation between Morphology and Evolution of Euphorbiaceae s.l. using Taxonomic Congruence and Total Evidence

2021 ◽  
Vol 9 (1) ◽  
pp. 49-55
Author(s):  
Vanlal hruaia ◽  
◽  
Lal rinmuana ◽  
J Lalbiaknunga ◽  
Laldinfeli Ralte
Keyword(s):  
Phylogenetic Tree ◽  
Evolutionary Relationship ◽  
Cladistic Analysis ◽  
Morphological Characters ◽  
Flowering Plants ◽  
Morphological Features ◽  
Total Evidence ◽  
Pictorial Representation ◽  
Phenetic Analysis ◽  
Morphological Relationship

Euphorbiaceae is one of the largest family of flowering plants, in our study different species were collected from different localities of Mizoram, the collected specimens were studied and their morphological features noted. 34 genera of Euphorbiaceae s.l were used in the study. Cladistic analysis was performed in Mesquite software and Phenetic analysis was done in NTsys software. Both analyses produce a pictorial representation in a form of a tree; cladistic analysis produce phylogenetic tree (evolutionary relationship) while phenetic analysis produce phenogram (morphological relationship). The results of the aforementioned analyses were further analysed by total evidence technique and taxonomic congruence, a phylogenetic software PAUP is used for this purpose. The resultant trees were very different and comparison was done to find correlation between evolution and morphological characters. The research finds various correlation among characters like the number of locule in ovule, phyllanthoid branching and support the inclusion of genus like Breynia, Sauropus into Phyllanthus.

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 An updated infrageneric classification of the oaks: review of previous taxonomic schemes and synthesis of evolutionary patterns

2017 ◽  
Author(s):  
Thomas Denk ◽  
Guido W. Grimm ◽  
Paul S. Manos ◽  
Min Deng ◽  
Andrew Hipp
Keyword(s):  
Molecular Phylogenetics ◽  
Morphological Characters ◽  
Evolutionary Patterns ◽  
Traditional Concept ◽  
Infrageneric Classification ◽  
Systematic Scheme ◽  
Molecular Phylogenetic ◽  
History Of ◽  
Phylogenetic Lineages

In this paper, we review major classification schemes proposed for oaks by John Claudius Loudon, Anders Sandøe Ørsted, William Trelease, Otto Karl Anton Schwarz, Aimée Antoinette Camus, Yuri Leonárdovich Menitsky, and Kevin C. Nixon. Classifications of oaks (Fig. 1) have thus far been based entirely on morphological characters. They differed profoundly from each other because each taxonomist gave a different weight to distinguishing characters; often characters that are homoplastic in oaks. With the advent of molecular phylogenetics our view has considerably changed. One of the most profound changes has been the realisation that the traditional split between the East Asian subtropical to tropical subgenus Cyclobalanopsis and the subgenus Quercus that includes all other oaks is artificial. The traditional concept has been replaced by that of two major clades, each comprising three infrageneric groups: a Palearctic-Indomalayan clade including Group Ilex (Ilex oaks), Group Cerris (Cerris oaks) and Group Cyclobalanopsis (cycle-cup oaks), and a predominantly Nearctic clade including Group Protobalanus (intermediate or golden cup oaks), Group Lobatae (red oaks) and Group Quercus (white oaks, with most species in America and some 30 species in Eurasia). The main morphological feature characterising these phylogenetic lineages is pollen morphology, a character overlooked in traditional classifications. This realisation, along with the now available (molecular-)phylogenetic framework, opens new avenues for biogeographic, ecological and evolutionary studies and a re-appraisal of the fossil record. We provide an overview about recent advances in these fields and outline how the results of these studies contribute to the establishment of a unifying systematic scheme of oaks. Ultimately, we propose an updated classification of Quercus recognising two subgenera with eight sections. This classification considers morphological traits, molecular-phylogenetic relationships, and the evolutionary history of one of the most important temperate woody plant genera.

New species of Humicola: an approach to genetic and biochemical classification

1976 ◽  
Vol 54 (24) ◽  
pp. 2755-2768 ◽  
Author(s):  
Marco de Bertoldi
Keyword(s):  
New Species ◽  
Base Composition ◽  
Genetic Relationships ◽  
Morphological Characters ◽  
Morphological Features ◽  
Dna Base Composition ◽  
Dna Base

Thirteen new species of Humicola are described: H. aurea, H. glauca, H. lutea, H. piriformis, H. repens, H. sardiniae, H. variabilis, H. atra, H. austera, H. globosa, H. nivea, H. rugosa, and H. veronae. The classification is based not only on morphological characters but also on genetic and biochemical ones. In Hyphomycetes similarities in morphology do not necessarily indicate genetic relationships. DNA base composition (guanine–cytosine percentage, GC%) and electrophoretic characteristics of enzymes used together with morphological features have proved to be useful and of taxonomical value in the classification of the new species of Humicola.

Classification of Wear Particles Based on Qualitative Morphological Features

2005 ◽  
Author(s):  
R. H. Chang ◽  
Hosung Kong ◽  
Eui-Sung Yoon ◽  
Dong-Hoon Choi
Keyword(s):  
Image Recognition ◽  
Morphological Feature ◽  
Wear Debris ◽  
Morphological Features ◽  
Multidimensional Space ◽  
Semantic Features ◽  
Wear Particles ◽  
Wear Mode ◽  
Wear Monitoring

Wear debris morphology is closely related to the wear mode and mechanism occurred. Image recognition of wear particles is, therefore, a powerful tool in wear monitoring. An algorithm of classification of wear particles is proposed based on qualitative morphological features. The standard classes are presented as a set of vectors of coded ratings. Descriptions of the standards are based on the knowledge-base of experts. A distance between the particle and the standard classes in the multidimensional space of features showed rating of the similarity. The classification of particles is determined by identifying the closet standard. The coding of the semantic features of the morphological feature of wear particles was demonstrated to be useful for classification with statistical methods. The results showed that the presented method was satisfactory in solving practical problems.

Phylogeny, major clades and infrageneric classification of Corymbia (Myrtaceae), based on nuclear ribosomal DNA and morphology

2009 ◽  
Vol 22 (5) ◽  
pp. 384 ◽  
Author(s):  
Carlos Parra-O. ◽  
Michael J. Bayly ◽  
Andrew Drinnan ◽  
Frank Udovicic ◽  
Pauline Ladiges
Keyword(s):  
Ribosomal Dna ◽  
Convergent Evolution ◽  
Morphological Characters ◽  
Molecular Data ◽  
Nuclear Ribosomal Dna ◽  
Molecular Evidence ◽  
Nuclear Rdna ◽  
Infrageneric Classification ◽  
Taxonomic Categories

Phylogenetic relationships of sections and species within Corymbia (Myrtaceae), the bloodwood eucalypts, were evaluated by using combined analyses of nuclear rDNA (ETS + ITS) and morphological characters. Combining morphological characters with molecular data provided resolution of relationships within Corymbia. The analyses supported the monophyly of the genus and recognition of the following two major clades, treated here as new subgenera: subgenus Corymbia, including informal sections recognised by Hill and Johnson (1995), namely Rufaria (red bloodwoods), Apteria and Fundoria; and subgenus Blakella, including sections Politaria (spotted gums), Cadagaria, Blakearia (paper-fruited bloodwoods or ghost gums) and Ochraria (yellow bloodwoods). Hill and Johnson’s section Rufaria is monophyletic if Apteria and Fundoria are included. It is evident that, among the red bloodwoods, series are not monophyletic and several morphological characters result from convergent evolution. There was strong morphological and molecular evidence that the three species of red bloodwoods that occur in south-western Western Australia (series Gummiferae: C. calophylla and C. haematoxylon, and series Ficifoliae: C. ficifolia) form a monophyletic group, separate from the eastern C. gummifera (series Gummiferae), which is probably sister to the clade of all other red bloodwoods. Phylogenetic results supported recognition of new taxonomic categories within Corymbia, and these are formalised here.

Phylogenetic Analysis of the New World Family Heterothripidae (Thysanoptera, Terebrantia) based on Morphological and Molecular Evidence

2019 ◽  
Vol 50 (5) ◽  
pp. 702-716 ◽  
Author(s):  
Veronica Pereyra ◽  
Adriano Cavalleri ◽  
Claudia Szumik ◽  
Christiane Weirauch
Keyword(s):  
Phylogenetic Analysis ◽  
New World ◽  
Sister Group ◽  
Molecular Data ◽  
Species Level ◽  
Total Evidence ◽  
Molecular Evidence ◽  
Large Genus ◽  
Morphological And Molecular Data

The New World family Heterothripidae (~90 spp., four genera) comprises flower-feeding and ectoparasitic thrips. The monophyly of the group has remained untested and species-level relationships were unknown. Morphological (123 characters) and molecular (28S rDNA D2 and D3-D5, H3, and partial COI) data were compiled to reconstruct phylogenetic relationships of this group. The ingroup was represented by 65 species of the four recognized Heterothripidae genera (Aulacothrips Hood, Heterothrips Hood, Lenkothrips De Santis & Sureda, and Scutothrips Stannard). The monophyly of Heterothripidae was recovered in the total evidence and molecular data only analyses with the ectoparasitic Aulacothrips placed as the sister group of the remaining Heterothripidae. The large genus Heterothrips (>80% of the species-level diversity), which was thoroughly sampled in our analyses (56 species), was recovered as paraphyletic with respect to Scutothrips and Lenkothrips. We conclude that additional morphological and molecular data would be desirable before revising the classification of Heterothripidae

Corrigendum to: Phylogeny, major clades and infrageneric classification of Corymbia (Myrtaceae), based on nuclear ribosomal DNA and morphology

2010 ◽  
Vol 23 (2) ◽  
Author(s):  
Carlos Parra-O. ◽  
Michael J. Bayly ◽  
Andrew Drinnan ◽  
Frank Udovicic ◽  
Pauline Ladiges
Keyword(s):  
Ribosomal Dna ◽  
Convergent Evolution ◽  
Morphological Characters ◽  
Molecular Data ◽  
Nuclear Ribosomal Dna ◽  
Molecular Evidence ◽  
Nuclear Rdna ◽  
Infrageneric Classification ◽  
Taxonomic Categories

Phylogenetic relationships of sections and species within Corymbia (Myrtaceae), the bloodwood eucalypts, were evaluated by using combined analyses of nuclear rDNA (ETS + ITS) and morphological characters. Combining morphological characters with molecular data provided resolution of relationships within Corymbia. The analyses supported the monophyly of the genus and recognition of the following two major clades, treated here as new subgenera: subgenus Corymbia, including informal sections recognised by Hill and Johnson (1995), namely Rufaria (red bloodwoods), Apteria and Fundoria; and subgenus Blakella, including sections Politaria (spotted gums), Cadagaria, Blakearia (paper-fruited bloodwoods or ghost gums) and Ochraria (yellow bloodwoods). Hill and Johnson's section Rufaria is monophyletic if Apteria and Fundoria are included. It is evident that, among the red bloodwoods, series are not monophyletic and several morphological characters result from convergent evolution. There was strong morphological and molecular evidence that the three species of red bloodwoods that occur in south-western Western Australia (series Gummiferae: C. calophylla and C. haematoxylon, and series Ficifoliae: C. ficifolia) form a monophyletic group, separate from the eastern C. gummifera (series Gummiferae), which is probably sister to the clade of all other red bloodwoods. Phylogenetic results supported recognition of new taxonomic categories within Corymbia, and these are formalised here.

Molecular Phylogeny of Axonopus (Poaceae, Panicoideae, Paspaleae): Monophyly, Synapomorphies, and Taxonomic Implications for Infrageneric Classification and Species Complexes

2020 ◽  
Vol 105 (4) ◽  
pp. 459-480
Author(s):  
Carolina Delfini ◽  
Juan M. Acosta ◽  
Vinicius Castro Souza ◽  
Fernando O. Zuloaga
Keyword(s):  
Phylogenetic Analyses ◽  
Morphological Characters ◽  
Character State ◽  
Infrageneric Classification ◽  
Ancestral Character State ◽  
Limited Sampling ◽  
Species Complexes ◽  
External Transcribed Spacer ◽  
Taxonomic Implications

Axonopus P. Beauv. comprises nearly 90, mostly New World, species characterized by having spikelets with the inverse position (i.e., the backs of the upper glume and the upper lemma turned away from the rachis). The genus has been divided into four sections, five series, and three subseries, based exclusively on morphological features. Previous phylogenetic analyses based on a limited sampling of species showed Axonopus to be a monophyletic genus. In this study we increased the number of species sampled (46 species in the combined tree) and sequenced four DNA regions (external transcribed spacer [ETS], internal transcribed spacer [ITS], trnL-F, and ndhF). We tested the monophyly of Axonopus and its traditional infrageneric categories using parsimony, likelihood, and Bayesian inference. Additionally, we performed ancestral character state reconstructions of 45 morphological characters to infer autapomorphies of the species and synapomorphies for the genus and clades. Our findings confirmed Axonopus as a monophyletic genus only when Centrochloa Swallen and Ophiochloa Filg., Davidse & Zuloaga are included within it. Our analyses also showed that, with the exception of section Lappagopsis, infrageneric categories from previous classifications of the genus are artificial. Twenty-one morphological character states were identified as potential autapomorphies; two were reconstructed as potential synapomorphies for Axonopus, whereas 12 were reconstructed as potential synapomorphies for specific clades within the genus. Further molecular analyses, including sequencing of unlinked nuclear genes, are needed in order to reach a robust phylogenetic classification of the genus.

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