Studies on the Chromosomes of the Scallop Pecten Maximus (L.) and Related Species

1974 ◽  
Vol 54 (3) ◽  
pp. 713-718 ◽  
Author(s):  
A. R. Beaumont ◽  
LL. D. Gruffydd
Keyword(s):  
Crassostrea Virginica ◽  
Chromosome Numbers ◽  
Related Species ◽  
Reliable Method ◽  
Ostrea Lurida ◽  
Pecten Maximus ◽  
Commercial Importance ◽  
Number Of Species ◽  
The Family ◽  
The World

A number of species of the family Pectinidae (Lamellibranchia, Mollusca) are of considerable commercial importance in many parts of the world. Many of these are being reared in laboratories and hatcheries and this has made easier studies of cytogenetics using eggs and embryos, and ultimately will make studies of their genetics feasible. Recently, simple squash techniques have provided a fast and reliable method for obtaining chromosome numbers from eggs and embryos of several bivalves including Mercenaria spp. (Menzel & Menzel, 1965), Ostrea lurida and Crassostera gigas (Ahmed & Sparks, 1967), Mytilus spp. (Ahmed & Sparks, 1970), and Crassostrea spp. (Menzel, 1968). In 1967, Longwell, Stiles & Smith published the karyotype of Crassostrea virginica obtained from embryos which had been treated with colchicine.

A first preliminary study of the shallow water sponge fauna from Cyprus Island (Eastern Mediterranean)

Zootaxa ◽  
2018 ◽  
Vol 4450 (5) ◽  
pp. 594
Author(s):  
COSTA GABRIELE ◽  
GIUSSANI VALENTINA ◽  
KLETOU DEMETRIS ◽  
KLEITOU PERIKLIS ◽  
PANSINI MAURIZIO ◽  
...  
Keyword(s):  
Shallow Water ◽  
Mediterranean Sea ◽  
Eastern Mediterranean ◽  
Sponge Species ◽  
Commercial Importance ◽  
The Past ◽  
Number Of Species ◽  
Mediterranean Areas ◽  
The World ◽  
Preliminary Study

Currently, more than 8,500 valid sponge species are reported in the World Porifera Database (http://www.marinespecies.org/porifera/) (van Soest et al. 2018). The Mediterranean Sea sponge fauna, counting almost 700 species, is one of the best documented in the world (Pronzato 2003; Pansini et al. 2011; van Soest et al. 2018) but the eastern part of the basin is by far less studied, in comparison with other Mediterranean areas (Pansini et al. 2000; Voultsiadou & Vafidis 2004; Topaloğlu & Evcen 2014). A small number of species, mainly belonging to the cosmopolitan genus Spongia (Dictyoceratida), are commonly used as bath sponges. Aim of this work is to provide further information on Cyprus Island sponges in general and on species that had commercial importance in the past. 

Checklist of marine and freshwater halacarid mite genera and species (Halacaridae: Acari) with notes on synonyms, habitats, distribution and descriptions of the taxa

Zootaxa ◽  
2009 ◽  
Vol 1998 (1) ◽  
pp. 1-170 ◽  
Author(s):  
ILSE BARTSCH
Keyword(s):  
Brackish Water ◽  
Valid Species ◽  
Number Of Species ◽  
The Family ◽  
The World ◽  
Species Inquirendae

At the end of 2007, the family Halacaridae, superfamily Halacaroidea, included 1118 valid species in 63 genera. The genera and the number of species (in parentheses) are: Acanthohalacarus (1), Acanthopalpus (2), Acarochelopodia (8), Acaromantis (11), Acarothrix (5), Actacarus (24), Agaue (42), Agauides (2), Agauopsis (85), Anomalohalacarus (19), Arenihalacarus (1), Arhodeoporus (31), Astacopsiphagus (1), Atelopsalis (7), Australacarus (5), Bathyhalacarus (12), Bradyagaue (17), Camactognathus (3), Caspihalacarus (1), Coloboceras (3), Colobocerasides (2), Copidognathides (3), Copidognathus (359), Corallihalacarus (1), Enterohalacarus (1), Halacarellus (47), Halacaroides (2), Halacaropsis (5), Halacarus (75), Halixodes (3), Hamohalacarus (1), Himejacarus (1), Isobactrus (26), Limnohalacarus (13), Lobohalacarus (6), Lohmannella (36), Metarhombognathus (2), Mictognathus (3), Parasoldanellonyx (3), Parhalixodes (2), Pelacarus (1), Peregrinacarus (2), Phacacarus (1), Porohalacarus (2), Porolohmannella (1), Rhombognathides (6), Rhombognathus (103), Ropohalacarus (1), Scaptognathides (11), Scaptognathus (30), Simognathus (45), Soldanellonyx (9), Spongihalacarus (1), Stygohalacarus (1), Thalassacarus (1), Thalassarachna (14), Thalassophthirius (1), Troglohalacarus (1), Tropihalacarus (2), Werthella (10), Werthelloides (1), Winlundia (2), and Xenohalacarus (1). More than 1000 species live in marine and brackish water and almost 60 species exclusively in fresh or oligohaline to mesohaline brackish water (< S18‰). The checklist presents names used for halacarid genera and species of the world, names recognized as valid, synonyms, nomina nuda, names of species inquirendae and species erroneously attributed to the family Halacaridae. All valid species are supplemented with distributional data, namely, biogeographical provinces, depth zones and habitats, and references of descriptions of genera and species.

Current approaches for the authentication of medicinal Dendrobium species and its products

2005 ◽  
Vol 3 (2) ◽  
pp. 144-148 ◽  
Author(s):  
Yan-Bo Zhang ◽  
Paul Pui-Hay But ◽  
Zheng-Tao Wang ◽  
Pang-Chui Shaw
Keyword(s):  
Endangered Species ◽  
Related Species ◽  
Present Status ◽  
Dna Microarrays ◽  
Source Material ◽  
High Price ◽  
Wild Fauna ◽  
The Family ◽  
The World ◽  
Different Parts

Dendrobium Sw., a member of the family Orchidaceae, includes approximately 1100 species distributed in different parts of the world. In China, the genus is represented by 76 species and two varieties, of which D. loddigesii, D. fimbriatum, D. chrysanthum, D. officinale (=D. candidum) and D. nobile are listed in the Chinese Pharmacopoeia as the source material for Herba Dendrobii (Shihu). Because of increased demand and high price, Herba Dendrobii is often adulterated in the trade by other related species. Many Dendrobium species are over-collected from the wild and are listed under endangered taxa in the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES). Therefore, a reliable authentication method is needed to regulate the trade and help conserve the species from unscrupulous collections. This review describes the present status of using medicinal Dendrobium in China, current approaches to authenticate medicinal Dendrobium plants and Herba Dendrobii, and the efforts under way towards the development of DNA microarrays to facilitate differentiation/identification of genuine material in complex Chinese medicinal formulations.

Does polyploidy occur in central European species of the family Sphaeriidae (Mollusca: Bivalvia)?

2010 ◽  
Vol 5 (6) ◽  
pp. 777-784 ◽  
Author(s):  
Tereza Kořínková ◽  
Alena Morávková
Keyword(s):  
Chromosome Numbers ◽  
Related Species ◽  
Chromosomal Rearrangements ◽  
Small Chromosome ◽  
Time Analysis ◽  
Chromosome Counts ◽  
The Family ◽  
Dna Contents ◽  
Acrocentric Chromosomes ◽  
First Time

AbstractSome representatives of the bivalve family Sphaeriidae are assumed to be polyploid. In this study, 11 sphaeriid species (nine of the genus Pisidium, one of Musculium, and one of Sphaerium) inhabiting central Europe were studied karyologically, 10 of them for the first time. Analysis revealed high chromosome numbers (from 140 to 240). To elucidate the origin of high chromosome numbers, DNA contents were measured by flow cytometry in 5 of the studied species and, for comparison, in S. corneum and S. nucleus, which are known to be diploid (2n=30). Species with high chromosome counts yielded very similar DNA contents that are not higher than in the related species with low diploid numbers. This finding contradicts a possible origin of these species by recent polyploidization or hybridization of related species. Chromosome complements of the investigated species with high chromosome numbers differ from those with low 2n in their small chromosome size and the high proportion of subtelo- or acrocentric chromosomes. This indicates their possible origin either by an ancient polyplodization event followed by chromosomal rearrangements or by multiple chromosome fissions.

scholarly journals Diversity of bulbous monocots in Turkey with special reference. Chromosome numbers

2002 ◽  
Vol 74 (4) ◽  
pp. 547-555 ◽  
Author(s):  
Neriman Özhatay
Keyword(s):  
Special Reference ◽  
Plant Diversity ◽  
Chromosome Numbers ◽  
Statistical Data ◽  
Flowering Plants ◽  
The Other ◽  
Chromosome Counts ◽  
Flora Of Turkey ◽  
Number Of Species ◽  
The World

Turkey is among the richest countries in the world in terms of plant diversity. The aim of this paper is to show diversity of the petaloid and bulbous plants, which belong to monocotyledones. According to Flora of Turkey and its supplements, the number of species of bulbous monocotyledones is around 688, of which 244 are endemic (endemism 35.4 %). According to the statistical data of Turkish flowering plants based on the published records, only 15 % of the flora have information about chromosome counts, although bulbous monocots percentage is higher at 58 %. Fritillaria and Tulipa are stable genera as regards chromosome numbers with 2n = 24 and karyotype; on the other hand, the most variable genera are Crocus (2n = 6, 8, 10, 12, 14, 16, 18, 20, 22, 26, 28, 30, 70) and Ornithogalum (2n = 12, 14, 16, 18, 20, 21, 24, 27, 28, 32, 40, 45, 54, 60, 80).

Studies in African Tachinidae (Diptera)

1927 ◽  
Vol 17 (4) ◽  
pp. 319-340 ◽  
Author(s):  
C. H. Curran
Keyword(s):  
South Africa ◽  
Natural History ◽  
South African ◽  
American Museum ◽  
Number Of Species ◽  
Entire Collection ◽  
The Family ◽  
The World ◽  
Adequate Idea ◽  
Extensive Collection

During the study of the Nearctic Tachinidae it became obvious that, in order to secure an adequate idea of the relationships of the various genera, it would be advisable to study representatives of the family from all parts of the world, and requests for African material met with hearty response from several sources. The extensive collection made by the American Museum of Natural History Congo Expedition has already been dealt with, and the report will appear elsewhere. Mr. H. K. Munro, of Pretoria, South Africa, has forwarded his entire collection with the request that it be worked over, since very few of the species were determined. Dr. Guy A. K.Marshall, Director of the Imperial Bureau of Entomology, has also been kind enough to forward a large amount of material, and a great deal more has been promised from other sources. It was originally intended to prepare a synopsis of the South African Tachinidae preparatory to a more detailed study. However, the large number of species and genera represented in the thousands of specimens at hand makes such an undertaking so extensive that it is deemed advisable to report upon certain genera or larger groups in order that most of the material may be returned to the owners, retaining such specimens as may be necessary for further study.

ON CHROMOSOME NUMBERS IN THE GRASS FAMILY (POACEAE) IN RUSSIA, WITH SPECIAL ATTENTION TO THE FAR EAST

2020 ◽  
Vol 68 ◽  
pp. 29-64
Author(s):  
N.S. Probatova ◽  
Keyword(s):  
Chromosome Numbers ◽  
Russian Far East ◽  
Far East ◽  
Grass Species ◽  
Original Material ◽  
Mountain Regions ◽  
Grass Family ◽  
The Far East ◽  
The World ◽  
The Russian Far East

The paper summarizes information on chromosome numbers (CNs) of the Grass species (Poaceae) in the flora of Russian Federation, obtained on the original material, most part - from the Russian Far East (RFE). In some species the CNs are known in Russia or in the world only from RFE, in some – from one locality or few, or from one subregion of RFE. The grass species in RFE often occur in mountain regions and near seacoasts; some species are endemics, some were studied near the limits of their geographical distribution areas. The diversity of CNs, the special features of the CNs distribution in some grass groups are discussed. The alien species are abundant in RFE, and their CNs are also involved in the study. For karyologically polymorphous species further studies are needed.

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