scholarly journals Primitive angiosperms in the Indian Subcontinent: taxonomic diversity and geographical distribution of Magnoliaceae Juss. (APG IV)

Pleione ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 137
Author(s):  
Uma Shankar
Keyword(s):  
Geographical Distribution ◽  
Indian Subcontinent ◽  
Taxonomic Diversity ◽  
Primitive Angiosperms

Widespread polyploid forms off Lumbricillus lineatus (Müller) (Enchytraeidae: Oligochaeta): comments on polyploidism in the enchytraeids

1995 ◽  
Vol 73 (9) ◽  
pp. 1727-1734 ◽  
Author(s):  
Kathryn A. Coates
Keyword(s):  
Geographical Distribution ◽  
Taxonomic Diversity ◽  
Conclusive Evidence ◽  
Global Distribution ◽  
Ploidy Levels ◽  
The Family ◽  
Ecological Breadth ◽  
New Habitats

Studies of a small fresh collection of the marine intertidal enchytraeid oligochaete Lumbricillus lineatus (Müller) and taxonomic collections from 27 additional locations in Europe, Canada, and Australia reveal the presence of morphotypes corresponding to parthenogenetic autopolyploid forms, triploid, tetraploid, and pentaploid, of the species in all the regions represented by the collections. The extension of the range of these cytotypes from Europe to a virtually global distribution raises questions about the significance of parthenogenesis and polyploidism to their invasion of new habitats. Differences in reproduction rates and the ecological breadth of the different ploidy levels are not known. The geographical distribution and abundance of polyploids of L. lineatus, in themselves, do not provide conclusive evidence for the repeated origins of polyploids within the species, but strongly suggest that possibility. General theories link evolutionary polyploidy among animals with parthenogenesis, as seen in the polyploid forms of L. lineatus. However, polyploidism combined with out-crossing underlies the present taxonomic diversity of the family Enchytraeidae.

scholarly journals Molecular Phylogeny, Diversity and Zoogeography of Net-Winged Beetles (Coleoptera: Lycidae)

Insects ◽  
2018 ◽  
Vol 9 (4) ◽  
pp. 154 ◽  
Author(s):  
Michal Masek ◽  
Michal Motyka ◽  
Dominik Kusy ◽  
Matej Bocek ◽  
Yun Li ◽  
...  
Keyword(s):  
East Asia ◽  
Plate Tectonics ◽  
Molecular Phylogenetics ◽  
Indian Subcontinent ◽  
Taxonomic Diversity ◽  
Current Data ◽  
Tropical Rainforests ◽  
Long Time ◽  
Turn Over ◽  
Support Relationships

We synthesize the evidence from molecular phylogenetics, extant distribution, and plate tectonics to present an insight in ancestral areas, dispersal routes and the effectiveness of geographic barriers for net-winged beetle tribes (Coleoptera: Lycidae). Samples from all zoogeographical realms were assembled and phylogenetic relationships for ~550 species and 25 tribes were inferred using nuclear rRNA and mtDNA markers. The analyses revealed well-supported clades at the rank of tribes as they have been defined using morphology, but a low support for relationships among them. Most tribes started their diversification in Southeast and East Asia or are endemic to this region. Slipinskiini and Dexorini are Afrotropical endemics and Calopterini, Eurrhacini, Thonalmini, and Leptolycini remained isolated in South America and the Caribbean after their separation from northern continents. Lycini, Calochromini, and Erotini support relationships between the Nearctic and eastern Palearctic faunas; Calochromini colonized the Afrotropical realm from East Asia and Metriorrhynchini Afrotropical and Oriental realms from the drifting Indian subcontinent. Most tribes occur in the Oriental and Sino-Japanese realms, the highest alpha-taxonomic diversity was identified in Malesian tropical rainforests. The turn-over at zoogeographical boundaries is discussed when only short distance over-sea colonization events were inferred. The lycid phylogeny shows that poor dispersers can be used for reconstruction of dispersal and vicariance history over a long time-span, but the current data are insufficient for reconstruction of the early phase of their diversification.

Taxonomic diversity and karyology of Anthemis rigida (Anthemideae, Asteraceae) in the Aegean, Greece

Phytotaxa ◽  
2021 ◽  
Vol 484 (1) ◽  
pp. 129-143
Author(s):  
KATERINA GOULA ◽  
THEOPHANIS CONSTANTINIDIS
Keyword(s):  
Chromosome Number ◽  
Geographical Distribution ◽  
Morphological Variation ◽  
Taxonomic Diversity ◽  
Distribution Map ◽  
Aegean Region ◽  
New Subspecies ◽  
Karyotype Formula ◽  
Morphometric Evaluation

This study investigates and taxonomically interprets the morphological variation of Anthemis rigida in the Aegean region (Greece). The eligulate plants are widespread and morphologically homogeneous whereas the ligulate forms are local and more variable. Based on a morphometric evaluation of 20 characters, four different ligulate subspecies are recognized; A. rigida subsp. antri-neptuni is described here as new. All taxa share the same chromosome number of 2n = 18 and are karyologically similar. The new subspecies slightly deviates in the karyotype formula, even though asymmetry indices do not discriminate among taxa in the group. Notes on the taxonomy, geographical distribution and habitat of all ligulate subspecies are provided, together with photographs and a distribution map.

A terminal Cretaceous giant pterosaur from the French Pyrenees

1997 ◽  
Vol 134 (4) ◽  
pp. 553-556 ◽  
Author(s):  
ERIC BUFFETAUT ◽  
YVES LAURENT ◽  
JEAN LE LOEUFF ◽  
MICHEL BILOTTE
Keyword(s):  
Geographical Distribution ◽  
Cervical Vertebra ◽  
Taxonomic Diversity ◽  
Accurate Estimate ◽  
Wing Span ◽  
Wide Geographical Distribution ◽  
Upper Maastrichtian

A very large pterosaur cervical vertebra is described from the Upper Maastrichtian deposits of Mérigon, in the foothills of the French Pyrenees. It resembles the vertebrae of Quetzalcoatlus, from the Maastrichtian of Texas, more than those of Arambourgiania, from the Maastrichtian of Jordan. The estimated wing span of the Mérigon pterosaur is close to 9 m, which makes it one of the largest known flying creatures. Giant pterosaurs still had a wide geographical distribution at the end of Maastrichtian time, which is not suggestive of a declining group, although it is difficult to obtain an accurate estimate of taxonomic diversity of terminal Cretaceous pterosaurs on the basis of available data.

scholarly journals About the monograph «Early Trlassic amphibians of Eastern Europe: evolution of dominant groups and peculiarities of communities change»

2019 ◽  
pp. 72-74
Author(s):  
V. N. Komarov
Keyword(s):  
Eastern Europe ◽  
Geographical Distribution ◽  
Lower Triassic ◽  
Taxonomic Diversity ◽  
Early Triassic ◽  
Eastern European ◽  
The World ◽  
History Of ◽  
New Ideas ◽  
First Time

The monograph is the first generalizing study on the fauna of the early Triassic amphibians of Eastern Europe, which reviews data on its taxonomic diversity, origin and ways of diversification of dominant groups, as well as their stratigraphic and geographical distribution. Original new ideas about the phylogenetic connections of separate taxa have been stated, stages of formation and the initial radiation of the dominant groups have been revealed and characterized. On this basis, the history of the development of Eastern European early Triassic tetrapods, known as the most fully documented in the world for that time, has been detailed. Significant changes have been made to the biostratigraphic scheme of the continental Lower Triassic of Eastern Europe for tetrapods, which made it possible to clarify or justify for the first time the age of a number of stratons, previously identified there.

Sati

Crisis ◽  
2005 ◽  
Vol 26 (2) ◽  
pp. 73-77 ◽  
Author(s):  
Dinesh Bhugra
Keyword(s):  
Mental Illness ◽  
Psychiatric Disorders ◽  
Indian Subcontinent ◽  
Cultural Factors ◽  
Role Expectations ◽  
Prevention Strategies ◽  
Social Causation ◽  
Gender Role Expectations ◽  
Good Wife ◽  
And Gender

Abstract. Sati as an act of ritual suicide has been reported from the Indian subcontinent, especially among the Hindus, for several centuries. Although legally proscribed, these acts occur even now in modern India. The principle behind such acts has been put forward as the principle of good wife. There is little evidence to suggest that women who commit this act suffer from a formal mental illness. Cultural factors and gender role expectations play a significant role in the act and its consequences. Using recent examples, this paper illustrates the cultural factors, which may be seen as contributing to the act of suicide. Other factors embedded in the act also emphasize that not all suicides have underlying psychiatric disorders and clinicians must take social causation into account while preparing any prevention strategies.

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