Étude caryologique de trois espèces d’Hypochoeris originaires d'Argentine : H. chillensis, H. microcephala var. albiflora et H. megapotamica

1994 ◽  
Vol 72 (10) ◽  
pp. 1496-1502 ◽  
Author(s):  
S. Siljak-Yakovlev ◽  
A. Bartoli ◽  
G. Roitman ◽  
N. Barghi ◽  
C. Mugnier
Keyword(s):  
Chromosome Number ◽  
Related Species ◽  
Secondary Constriction ◽  
Nucleolar Organizer ◽  
Asymmetry Index ◽  
Evolutionary Trend ◽  
Closely Related Species ◽  
Nucleolar Organizers ◽  
Morphological Differences ◽  
Secondary Constrictions

Three Hypochoeris species from Argentina with the same chromosome number (x = 4) and similar karyotypes (typically bimodal) show significant ecological and morphological differences. Comparative cytogenetic analysis was done for these taxa, producing karyotypes with correlated idiograms. The number of secondary constrictions and nucleolar organizers varied. The results from this study are discussed in terms of the mechanisms of microevolution within this group of closely related species, and in terms of the evolutionary trend in the genus and in the tribe Cichorieae. Key words: Hypochoeris, Cichorieae, bimodal karyotype, secondary constriction, nucleolar organizer, asymmetry index.

A reassessment of Dioon merolae (Zamiaceae) leads to the description of Dioon salas-moralesae, a new cycad species from Southeastern Oaxaca, Mexico

Phytotaxa ◽  
2021 ◽  
Vol 528 (2) ◽  
pp. 93-110
Author(s):  
JOSÉ SAID GUTIÉRREZ-ORTEGA ◽  
MIGUEL ANGEL PÉREZ-FARRERA ◽  
JEFFREY CHEMNICK ◽  
TIMOTHY J. GREGORY
Keyword(s):  
New Species ◽  
Morphological Variation ◽  
Related Species ◽  
Statistical Tests ◽  
Distinct Species ◽  
Closely Related Species ◽  
Morphometric Variation ◽  
Isthmus Of Tehuantepec ◽  
Morphological Differences ◽  
Recent Evaluation

The cycad genus Dioon comprises 17 species from Mexico and Honduras, all of them delimited based on their morphological variation and geographic distribution. A recent evaluation of the biological variation among Dioon populations from Oaxaca and Chiapas, Mexico, demonstrated that the concept of the species Dioon merolae actually consists of three lineages that should be recognized as different taxa. One lineage was already described as Dioon oaxacensis, leaving the concept of Dioon merolae comprising two lineages distributed on both sides of the Isthmus of Tehuantepec. However, there are conspicuous morphological differences between these two lineages. Here, we tested whether such a differentiation within the concept of Dioon merolae merits the differentiation of two different taxa. We evaluated the qualitative and morphometric variation among populations belonging to the Dioon merolae lineages, and compared it with the closely related species Dioon oaxacensis. Morphological observations and statistical tests demonstrated that the populations of southeastern Oaxaca, traditionally considered as part of Dioon merolae, represent a distinct species that we described as Dioon salas-moralesae. Identifying the diagnostic characters of this new species helps enable an understanding of the criteria that should be considered to delineate the boundaries between other cycad species.

AN ANALYSIS OF INTERSPECIFIC AND INTRASPECIFIC MORPHOLOGICAL DIFFERENCES IN TWO CLOSELY RELATED SPECIES OF AMBLYSEIUS BERLESE USING METHODS OF NUMERICAL TAXONOMY (ACARINA: PHYTOSEHDAE)

1977 ◽  
Vol 109 (12) ◽  
pp. 1605-1618 ◽  
Author(s):  
D.A. Chant ◽  
R.I.C. Hansell ◽  
H.J. Rowell
Keyword(s):  
Host Plant ◽  
Morphological Variation ◽  
Related Species ◽  
Numerical Taxonomy ◽  
Valid Species ◽  
Closely Related Species ◽  
Multivariate Tests ◽  
Taxonomic Methods ◽  
Morphological Differences ◽  
Intraspecific Morphological Variation

AbstractMorphological variation between two closely related species in the genus Amblyseius Berlese was examined by numerical taxonomic methods. Multivariate tests indicated that A. canadensis Chant and Hansell and A. novaescotiae (Chant) represent two separate and distinct morphological groups. This supports their taxonomic retention as valid species. Intraspecific morphological variation was also examined and found to be correlated with climatic and host plant variables.

A new species of Gomesa (Oncidiinae, Orchidaceae) from inselbergs in Brazilian caatinga: morphological and karyological evidence

Phytotaxa ◽  
2018 ◽  
Vol 374 (2) ◽  
pp. 147 ◽  
Author(s):  
JOEL M. P. CORDEIRO ◽  
FELIPE NOLLET ◽  
MARIA TERESA BURIL ◽  
MARK W. CHASE ◽  
LEONARDO P. FELIX
Keyword(s):  
New Species ◽  
Chromosome Number ◽  
Geographical Distribution ◽  
Related Species ◽  
Species Differences ◽  
Flower Morphology ◽  
Closely Related Species ◽  
Restricted Distribution ◽  
A New Species

We describe a new species of Gomesa (Oncidiinae, Orchidaceae), Gomesa caatingana, with restricted distribution on caatinga inselbergs in Paraíba and Pernambuco States, Brazil. Morphological and karyological characters of the new species were compared with those of Gomesa flexuosa, which is morphologically the most closely related species. Differences in geographical distribution, habit, flower morphology and chromosome number support description of this new species.

Supplementary description of three species from the subfamily Cecidophyinae (Eriophyoidea: Eriophyidae) from the Nalepa collection

2018 ◽  
Vol 23 (5) ◽  
pp. 838
Author(s):  
Slavica M. Marinković ◽  
Philipp E. Chetverikov ◽  
Christoph Hörweg ◽  
Radmila Petanović
Keyword(s):  
Natural History ◽  
Related Species ◽  
Host Plants ◽  
Morphological Variability ◽  
Natural History Museum ◽  
Closely Related Species ◽  
History Museum ◽  
Morphological Differences

Supplementary descriptions of three cecidophyine species based on topotype specimens recovered from vials from the Nalepa collection kept in the Natural History Museum (Vienna, Austria) are given: Cecidophyes galii (Karpelles 1884) from Asperula aparine M. Bieb. and Galium mollugo L. (Rubiaceae), Chrecidus ruebsaameni (Nalepa 1895) com. nov. (transferred from Cecidophyopsis) from Andromeda polifolia L. (Ericaceae) and Colomerus bucidae (Nalepa 1904) from Bucida buceras L. (Combretaceae). Observations on the morphological variability of Colomerus bucidae from different host plants are given. Morphological differences between two closely related species, Cecidophyes galii and Cecidophyes rouhollahi Craemer 1999 are discussed. 

A new species of Trigonella sect. Ellipticae (Leguminosae-Papilionoideae) from Iran, including cytogenetic and anatomical notes

Phytotaxa ◽  
2015 ◽  
Vol 202 (1) ◽  
pp. 26 ◽  
Author(s):  
Massoud Ranjbar ◽  
ZAHRA HAJMORADI
Keyword(s):  
New Species ◽  
Chromosome Number ◽  
Related Species ◽  
Somatic Chromosome ◽  
Base Number ◽  
Somatic Chromosome Number ◽  
Chromosome Counts ◽  
Closely Related Species ◽  
A New Species

A new species, Trigonella bakhtiarica, from the Iranian province Chahar Mahal Va Bakhtiari is described, illustrated and compared to its most closely related species, T. aphanoneura. Trigonella bakhtiarica has a longer corolla and differs in the shape, surface and size of its pods, which are taxonomically informative characters in Trigonella sect. Ellipticae. Chromosome counts and meiosis assays show that both species are diploid, and that their euploid plants possess a somatic chromosome number of 2n = 2x = 16, which is consistent with the predicted base number of x = 8.

A clarification of Medicago sinskiae

1991 ◽  
Vol 69 (1) ◽  
pp. 100-106 ◽  
Author(s):  
Ernest Small ◽  
Brenda Brookes
Keyword(s):  
Chromosome Number ◽  
Key Words ◽  
Related Species ◽  
The Other ◽  
Species Status ◽  
Closely Related Species

Little information has been available to justify the species status of the rare Turkmenian Medicago sinskiae Uljan. recognized by Uljanova in 1964. The holotype and plants raised from its seeds were examined, the chromosome number was determined, and a numerical taxonomic comparison was made of M. sinskiae and the other 12 species of Medicago section Spirocarpos subsection Pachyspirae. It was found that M. sinskiae is well separated from the most closely related species of Medicago and deserves recognition at the rank of species. Key words: Medicago sinskiae, Leguminoseae, alfalfa, taxonomy.

Cytotaxonomic studies of Draba species of Canada and Alaska: D. ventosa, D. ruaxes, and D. paysonii

1971 ◽  
Vol 49 (8) ◽  
pp. 1455-1460 ◽  
Author(s):  
Gerald A. Mulligan
Keyword(s):  
North America ◽  
Chromosome Number ◽  
Related Species ◽  
Basic Chromosome Number ◽  
Base Number ◽  
Western North America ◽  
Closely Related Species ◽  
Basic Chromosome ◽  
Hexaploid Species

The cytotaxonomy of three closely related species of Draba, of the mountains of western North America, is discussed and a key is given: D. ventosa A. Gray (2n = 36), D. ruaxes Payson & St. John (2n = ca. 72), and D. paysonii Macbride (2n = 42). Evidence is presented demonstrating that D. ventosa and D. paysonii are triploids reproducing by agamospermy whereas the hexaploid species D. ruaxes is a sexual outcrosser. The former two species produce seed apomictically without any pollen stimulation. Draba ventosa and D. ruaxes have the basic chromosome number x = 12 and D. paysonii has the base number x = 14.

scholarly journals ABOUT SPECIES INDEPENDENCE OF POLYSTICHUM SUBTRIPTERON TZVEL.

2016 ◽  
Vol 6 (2) ◽  
pp. 80-86 ◽  
Author(s):  
I. A. Kreshchenok ◽  
T. A. Sinitsyna ◽  
M. G. Kutsev ◽  
S. V. Smirnov ◽  
A. I. Shmakov
Keyword(s):  
Related Species ◽  
Far East ◽  
Genetic Isolation ◽  
Closely Related Species ◽  
Fragment Analysis ◽  
Island Populations ◽  
The Far East ◽  
Dna Fragment ◽  
Morphological Differences ◽  
Range Of Variation

<p>The article discusses the species independence of <em>Polystichum subtripteron</em> Tzvel. The spore structure and size of 2 closely related species – <em>P. subtripteron</em> and <em>P. tripteron </em>were studied. Morphological differences of fronds fit into the overall range of variation; there are no differences in the spore external structure. DNA fragment analysis (ISSR) of 19 specimens of both species was conducted. Fragment analysis revealed no significant differences between <em>P. tripteron </em>and <em>P. subtripteron</em> samples. All differences are probably due to genetic isolation of populations, and the island populations are closer together. On the basis of the research we conclude that in the Far East one species <em>Polystichum tripteron</em> grows, and <em>P. subtripteron</em> can be considered its synonym.</p>

Chaetogastra cogniauxiana (Melastomataceae), a new Brazilian species from the Chaetogastra gracilis complex

Phytotaxa ◽  
2021 ◽  
Vol 511 (3) ◽  
Author(s):  
FABRÍCIO SCHMITZ MEYER ◽  
RENATO GOLDENBERG
Keyword(s):  
Species Richness ◽  
New Species ◽  
Related Species ◽  
Herbarium Specimens ◽  
Field Observations ◽  
Distribution Map ◽  
Closely Related Species ◽  
Great Species ◽  
Morphological Differences ◽  
Great Species Richness

Eleven varieties of Tibouchina gracilis were indicated as synonyms of Chaetogastra gracilis in the most recent work on the taxonomy of the genus. However, field observations and a more detailed analysis of herbarium specimens, including the types, led us to the conclusion that two of these varieties represent a single new species. Chaetogastra cogniauxiana is endemic to Brazil, and differs from C. gracilis by the smaller size, 10–70 cm tall (versus 30–120 cm tall in C. gracilis), dendritic-setose to dendritic-strigose hypanthium and bracteoles (vs. dendritic-sericeous hypanthium and bracteoles), and smaller petals, 9.8–13.4 × 8.8–9.1 mm (vs. larger petals, 16.5–21.6 × 11.2–14.8 mm). In this article, we provide a complete description of C. cogniauxiana, and indicate the main morphological differences between C. cogniauxiana and the most closely related species. We also provide comments on taxonomy and phylogenetic relationships of this species, photos, illustrations, and a distribution map. This work is part of a monograph of the genus Chaetogastra in Brazil, which showed a great species richness and also the necessity of several taxonomic adjustments.

Mites of the family Parasitidae Oudemans, 1901 (Acari: Mesostigmata) from Japan: a new species of Vulgarogamasus Tichomirov, 1969, and a key to Japanese species

Zootaxa ◽  
2018 ◽  
Vol 4429 (2) ◽  
pp. 379 ◽  
Author(s):  
MOHAMED W. NEGM ◽  
TETSUO GOTOH
Keyword(s):  
New Species ◽  
Related Species ◽  
Japanese Literature ◽  
Key To Species ◽  
Japanese Species ◽  
Closely Related Species ◽  
The Family ◽  
Ibaraki Prefecture ◽  
Morphological Differences ◽  
A New Species

Vulgarogamasus edurus sp. nov. (Acari: Parasitidae) is described based on females, deutonymphs and males extracted from leaf litter and soil in Ami, Ibaraki Prefecture, Japan. Morphological differences between the new species and its closely related species, Vulgarogamasus fujisanus (Ishikawa, 1972), are recorded based on the examination of type materials. Information about parasitid mites reported in Japanese literature is reviewed, and a key to species is provided. 

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