A change in the taxonomic rank of Senna andhrica P. V. Ramana, J. Swamy & M. Ahmed. (Fabaceae: Caesalpinioideae)

Phytotaxa ◽  
2021 ◽  
Vol 512 (4) ◽  
Author(s):  
KAI-WEN JIANG
Keyword(s):  
Morphological Characters ◽  
Taxonomic Rank ◽  
Original Figure

Senna andhrica P. V. Ramana, J. Swamy & M. Ahmed. is better treated as a variety of S. occidentalis (L.) Link, as S. occidentalis var. andhrica (P. V. Ramana, J. Swamy & M. Ahmedullah) K. W. Jiang, based on its diagnostic morphological characters of unifoliolate leaves and 2–3 carpellate gynoecium. Attention is drawn to an error in the original figure published with the description of Senna andhirica, the seeds specified by the authors are actually belong to a taxon of Crotalaria.

scholarly journals Achene morphology and pericarp anatomy of Anemone Hepatica and Pulsatilla (Anemoninae, Ranunculaceae)

2020 ◽  
Author(s):  
Balkrishna Ghimire ◽  
Dong Chan Son ◽  
Dabin Yum ◽  
Jae Hyun Kim ◽  
Mi Jin Jeong
Keyword(s):  
Morphological Characters ◽  
Limited Range ◽  
Seed Morphology ◽  
Taxonomic Rank ◽  
Its Phylogeny ◽  
Cell Form ◽  
The Family ◽  
Cell Layers ◽  
Taxonomic Implications ◽  
One Way Anova

Abstract Background Fruit morphological characters have contributing useful taxonomic data and thus used to discriminate the species in different taxonomic rank. The fruit and seed morphology and anatomy in the family Ranunculaceae has been a long history and proved to be a great value for its phylogeny. Methods Achene morphology and pericarp anatomy of 12 taxa representing three genera (Anemone, Hepatica, and Pulsatilla) of tribe Anemoninae were investigated using microtome and light microscopy (LM) to evaluate taxonomic implications of achene characters. Results The achenes of Anemone were elliptical or obovoid and beaked, whereas the achene of Hepatica and Pulsatilla were obovoid and elliptical, respectively. Noticeable variations in both quantitative and qualitative features of achenes were observed among the species of three genera. One-way ANOVA indicated that the quantitative achene variables among the species were highly significant (P < 0.001). Pearson’s correlation coefficient also showed a significant correlation between different achene variables. The pericarp structure, particularly the number of cell layers and cell form in exocarp and endocarp seems to very useful for species delimitation in Amenome and Hepatica. The nature of endotesta could provide a substantial proof for sub-generic classification in Anemone. The UPGMA analysis also showed the utility of achene features for taxonomic groupings of the species within studied genera. Conclusion Although the sampling specimens represented a limited range of taxa the achene features and pericarp anatomy provide a reasonable source for the taxonomic treatment of studied genera within the tribe.

scholarly journals Phylogeny and classification of Eucalyptus subgenus Eudesmia (Myrtaceae) based on nuclear ribosomal DNA, chloroplast DNA and morphology

2009 ◽  
Vol 22 (3) ◽  
pp. 158 ◽  
Author(s):  
Adele K. Gibbs ◽  
Frank Udovicic ◽  
Andrew N. Drinnan ◽  
Pauline Y. Ladiges
Keyword(s):  
Chloroplast Dna ◽  
Intergenic Spacer ◽  
Morphological Characters ◽  
Nuclear Ribosomal Dna ◽  
Maximum Parsimony Analysis ◽  
Taxonomic Rank ◽  
Intergenic Spacer Region ◽  
Main Clade ◽  
Rdna Sequences ◽  
South Wales

Phylogenetic analysis of Eucalyptus subgenus Eudesmia is presented on the basis of the following three datasets: sequences of the internal transcribed spacer (ITS) and the external transcribed spacer (ETS) regions from nuclear rDNA, sequences of the psbA–trnH intergenic spacer region from chloroplast DNA, and morphological characters, including stamen bundling, operculum development, seeds and trichomes. Studies of floral development were essential for understanding the morphology of mature flowers and interpretation of synapomorphy and homoplasy. A summary phylogeny was constructed from a maximum parsimony analysis of those nodes coded as characters that had support in the molecular trees together with morphological characters. A revised infra-subgeneric classification is presented on the basis of the summary phylogeny, and compared with classifications of Hill and Johnson (1998) and Brooker (2000). Differences relate to relationships between clades and taxonomic rank (sections, series and subseries) and valid names of Brooker (2000) are conserved where possible. One main clade of 14 species (section Limbatae), many of mallee growth form, was found in all analyses; this clade is distributed in the South-West of Western Australia and adjacent Interzone and desert areas. A second main clade (section Complanatae) occurs in the northern and eastern tropical and subtropical regions of Australia, including Kimberley, Arnhem, Queensland and New South Wales. This section includes E. tetrodonta, previously treated as an isolated taxon in a monotypic section; however, this species is related to E. baileyana, E. similis, E. lirata and series Miniatae. The hypothesised phylogeny provides a framework for further analyses of biogeography and ecology, including functional traits.

Gross stomach morphology in akodontine rodents (Cricetidae: Sigmodontinae: Akodontini): a reappraisal of its significance in a phylogenetic context

2020 ◽  
Vol 101 (3) ◽  
pp. 835-857 ◽  
Author(s):  
Ulyses F J Pardiñas ◽  
Carola Cañón ◽  
Carlos A Galliari ◽  
Jorge Brito ◽  
Nuria Bernal Hoverud ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Molecular Phylogeny ◽  
Morphological Characters ◽  
Glandular Epithelium ◽  
Taxonomic Rank ◽  
Current Classification ◽  
Almost All

Abstract Akodontini, the second largest tribe within sigmodontine rodents, encompasses several stomach morphologies. This is striking because most sigmodontine groups of comparable taxonomic rank are very conservative in this respect. Based on extensive sampling of newly dissected specimens (213 stomachs representing 36 species), as well as published examples, covering almost all akodontine living genera (15 of 16), we undertook a reappraisal of the gross morphology of this organ. We then mapped this information, together with gallbladder occurrence, in a refined multilocus molecular phylogeny of the tribe. We surveyed three different configurations of stomachs in akodontines, according to the degree of development and location of the glandular epithelium; in addition, two minor variations of one of these types were described. Of the five major clades that integrate Akodontini, four are characterized by a single stomach morphology, while one clade exhibits two morphologies. Mapping stomach type on the phylogeny recovered two configurations for the most recent ancestor of Akodontini. A revised survey of gallbladder evidence also revealed overlooked congruencies. The observed stomach diversity and its arrangement in the phylogeny, along with additional morphological characters and the genetic diversity among the main clades, supports the necessity of changes in the current classification of the tribe. Recognition of subtribes or partitioning of Akodontini into several additional tribes of equal rank could be suitable options.

Morphogenesis and Evolution

1988 ◽  
Author(s):  
Keith Stewart Thomson
Keyword(s):  
Gene Expression ◽  
Developmental Stages ◽  
Functional Integration ◽  
Morphological Characters ◽  
Downward Causation ◽  
Evolutionary Mechanisms ◽  
Taxonomic Rank ◽  
Phenotypic Characters ◽  
New Gene ◽  
Different Levels

In the preceding chapters we have built up the premises of an argument concerning morphogenesis and evolution. These are as follows: 1.Evolution occurs through processes of introduction and sorting of variation. 2.In a genealogical hierarchy, introduction and sorting of variation can occur at a series of focal levels and it is a property of the hierarchy that there is upward and downward causation between focal levels. 3.The crucial role of developmental processes with respect to evolutionary mechanisms is in the causation of new phenotypes. Phenotypes are always expressed in individual organisms, but the properties of other focal levels in the genealogical hierarchy must also be considered. 4.Development is also essentially hierarchical, involving processes acting at different focal levels. Each level is defined as the place where new gene expression occurs. For simplicity we can divide its hierarchy into stages from early pattern formation to late cytodifferentiation, each including unknown (but very large) numbers of phases of new gene expression. It must be noted that ontogeny of a given individual or given taxon represents a route through the basic hierarchy of developmental stages that, through historical accident or selective bias, may be extremely convoluted and unpredictable. 5.In the systematics of any group, there is a general correlation between taxonomic rank and different grades or ranks of morphological characters. There is a series of levels or grades of generality of phenotypic characters caused at different levels of the morphogenetic hierarchy. 6.The morphogenetic hierarchy that produces the different grades of phenotypic morphology can potentially involve upward but little if any downward causation. 7.The course of evolution appears principally to produce clusters of evolutionarily equivalent species rather than lines of progressive change. At any taxonomic level, diversification within a group has therefore to be distinguished from those rarer phases of progressive evolution leading to establishment of new groups. The two involve quite different processes because they involve the morphogenetic causation of different levels of morphological characters. 8.Phenotypic characters may occur in groups that are linked both in the sense of functional integration of the phenotype itself and/or by virtue of the integration and interdependency of developmental pathways in morphogenesis.

scholarly journals The monophyly and relative rank of alticine and galerucine leaf beetles: A cladistic analysis using adult morphological characters (Coleoptera: Chrysomelidae)

1999 ◽  
Vol 30 (4) ◽  
pp. 397-416 ◽  
Author(s):  
S.W. Lingafelter ◽  
A.S. Konstantinov
Keyword(s):  
Cladistic Analysis ◽  
Morphological Characters ◽  
Monophyletic Group ◽  
Successive Approximations ◽  
Phylogenetic Hypothesis ◽  
Taxonomic Rank ◽  
Leaf Beetles ◽  
Relative Rank ◽  
Cladistic Analyses ◽  
Heuristic Analysis

AbstractThe first cladistic analysis to determine the monophyletic status of alticine and galerucine leaf beetles and their relationship to one another is provided. A classification based on their hypothesized relationships is proposed. Fifty morphological characters of adults were analyzed from twenty-nine taxa representing six traditionally recognized subfamilies (Orsodacninae, Aulacoscelidinae, Eumolpinae [including Synetini], Chrysomelinae, Galerucinae, and Alticinae), with an emphasis on thorough exemplar representation from galerucines and alticines. Cladistic analyses of these characters using the heuristic analysis of PAUP resulted in 444 equally most parsimonious cladograms, a consensus of which was mostly unresolved. Successive approximations weighting of these trees produced a nearly fully resolved hypothesis of relationships among the taxa. This hypothesis indicates the monophyly of chrysomelines + eumolpines + orsodacnines and monophyly of galerucines + alticines. Importantly, the alticines are a highly derived, strongly supported monophyletic group, nested within galerucines. Therefore, alticines must have a lower relative taxonomic rank (such as tribe) to Galerucinae in order to reflect this phylogenetic hypothesis.

Ultrastructural Localization of Phycocyanin in the Acidophilic, Thermophilic Alga, Cyanidium Caldarium

1973 ◽  
Vol 31 ◽  
pp. 462-463
Author(s):  
M. R. Edwards ◽  
J. D. Mainwaring
Keyword(s):  
Yellowstone National Park ◽  
National Park ◽  
Ultrastructural Localization ◽  
Review Of Literature ◽  
Cyanidium Caldarium ◽  
Taxonomic Rank ◽  
Thin Sections ◽  
Standard Methods ◽  
Laboratory Cultures

Although the general ultrastructure of Cyanidium caldarium, an acidophilic, thermophilic alga of questionable taxonomic rank, has been extensively studied (see review of literature in reference 1), some peculiar ultrastructural features of the chloroplast of this alga have not been noted by other investigators.Cells were collected and prepared for thin sections at the Yellowstone National Park and were also grown in laboratory cultures (45-52°C; pH 2-5). Fixation (glutaraldehyde-osmium), dehydration (ethanol), and embedding (Epon 812) were accomplished by standard methods. Replicas of frozenfracture d- etched cells were obtained in a Balzers apparatus. In addition, cells were examined after disruption in a French Press.

A New Species of Justicia (Acanthaceae: Acanthoideae: Justicieae) from Northeastern Brazil

2020 ◽  
Vol 45 (2) ◽  
pp. 328-333
Author(s):  
Camila Alcantara ◽  
Gleison Soares ◽  
Francisco de Assis Ribeiro dos Santos ◽  
Marccus Alves
Keyword(s):  
New Species ◽  
Rio Grande ◽  
Morphological Characters ◽  
Northeastern Brazil ◽  
Distribution Map ◽  
Key To Species ◽  
A New Species

Abstract—Justicia rubrobracteata, a new species from northeastern Brazil, is described and illustrated. The new species is morphologically similar to J. aequilabris due to its shrubby habit, and terminal and axillary spicate inflorescences with red flowers. However, J. rubrobracteata is differentiated mainly by the shape and color of its bracts and bracteoles as well as an orangish macula in the corolla, and a torulose capsule. In addition, J. rubrobracteata is only known from northeastern Brazil, from the states of Paraíba and Rio Grande do Norte, while J. aequilabris is widely distributed in Bolivia, Brazil, and Paraguay. A table with the main morphological characters of both species is included, as well as photographs, a key to species of Justicia for the states of Paraíba and Rio Grande do Norte in northeastern Brazil, a distribution map of both species, and conservation data for the new species.

Comparative Analysis of Genetic and Morphological Variation within the Platanthera hyperborea Complex (Orchidaceae)

2020 ◽  
Vol 45 (4) ◽  
pp. 767-778
Author(s):  
Eranga Wettewa ◽  
Nick Bailey ◽  
Lisa E. Wallace
Keyword(s):  
North America ◽  
Diploid Species ◽  
Morphological Characters ◽  
Evolutionary Patterns ◽  
Founding Population ◽  
Multiple Origins ◽  
Geographic Structure ◽  
Species Complexes ◽  
Nuclear Its ◽  
Cryptic Taxa

Abstract—Species complexes present considerable problems for a working taxonomy due to the presence of intraspecific variation, hybridization, polyploidy, and phenotypic plasticity. Understanding evolutionary patterns using molecular markers can allow for a more thorough assessment of evolutionary lineages than traditional morphological markers. In this study, we evaluated genetic diversity and phylogenetic patterns among taxa of the Platanthera hyperborea (Orchidaceae) complex, which includes diploid (Platanthera aquilonis) and polyploid (Platanthera hyperborea, P. huronensis, and P. convallariifolia) taxa spanning North America, Greenland, Iceland, and Asia. We found that three floral morphological characters overlap among the polyploid taxa, but the diploid species has smaller flowers. DNA sequence variation in a plastid (rpL16 intron) and a nuclear (ITS) marker indicated that at least three diploid species have contributed to the genomes of the polyploid taxa, suggesting all are of allopolyploid origin. Platanthera convallariifolia is most like P. dilatata and P. stricta, whereas P. huronensis and P. hyperborea appear to have originated from crosses of P. dilatata and P. aquilonis. Platanthera huronensis, which is found across North America, has multiple origins and reciprocal maternal parentage from the diploid species. By contrast, P. hyperborea, restricted to Greenland and Iceland, appears to have originated from a small founding population of hybrids in which P. dilatata was the maternal parent. Geographic structure was found among polyploid forms in North America. The area of Manitoba, Canada appears to be a contact zone among geographically diverse forms from eastern and western North America. Given the geographic and genetic variation found, we recommend continued recognition of four green-flowered species within this complex, but caution that there may be additional cryptic taxa within North America.

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