THREE FURTHER STUDIES OF THE CHROMOSOMES OF JAPANESE WEEVILS (COLEOPTERA: CURCULIONIDAE)

1970 ◽  
Vol 12 (2) ◽  
pp. 273-277 ◽  
Author(s):  
Yasushi Takenouchi
Keyword(s):  
Sex Chromosomes ◽  
Chromosome Numbers ◽  
No Reduction ◽  
Weevil Species ◽  
Large Pair ◽  
First Time

The chromosomes of three Japanese weevil species, two parthenogenetic and one bisexual, are described for the-first time. Males of the alate Cyrtepistomus castaneus are unknown. Oogonial metaphases had standard, 3x = 30, and substandard, 3x = 31, chromosome numbers (range ca. 28 — ca. 33). No reduction occurs at meiosis (ca. 30 univalents at MI). This species is therefore considered to be a triploid parthenote. Eight oocyte metaphases of Blosyrus japonicus, which also appears to lack males, showed between 66 and 61 (or 60) univalent chromosomes (two had 66, three had 65). These counts categorize the mothers as thelytokous hexaploids, a degree of polyploidy not previously found in the Curculionidae. The male of the bisexual Ceuthorrhynchus lewisi (2n = 28) possesses an unusually large pair of sex chromosomes. The metacentric X and telocentric Y form an achiasmate, umbrella-like bivalent that is unique among known Coleoptera.

scholarly journals Morphological, Anatomical and Cytological Studies of some Moss Species from Nigeria

2017 ◽  
Vol 9 (3) ◽  
pp. 404-413
Author(s):  
Abolade Oluremi BOLAJI ◽  
Julius Olaoye FALUYI
Keyword(s):  
Chromosome Numbers ◽  
Taxonomic Status ◽  
Knowledge Gaps ◽  
Moss Species ◽  
Anatomical Studies ◽  
First Time

Morphological, anatomical and chromosome studies of Hyophila crenulata C, Mull. Ex Dus, Thuidium gratum (P. Beauv) Jaeg., Barbula lambarenensis P. Vard.. Stereophyllum nitense Mitt. and Bryum coronatum Schwaegr from Nigeria, were carried out with a view to bridging some knowledge gaps that exist in their characterization and providing insightful information that could be useful in elucidating their taxonomic status. The morphological and anatomical studies revealed several gametophytic and sporophytic attributes which have not been previously reported and which were diagnostic for the moss species studied. The chromosome studies revealed the chromosome numbers to be Hyophila crenulata n = 4; Thuidium gratum n = 12 (10 + 2 m); Barbula lambarenensis n = 3; Stereophyllum nitense n = 9; and Bryum coronatum n = 10. The study concluded that the details of the morphological and anatomical descriptions as well as the chromosome numbers being reported for the first time in this study for the moss species studied could be very useful in their identification and taxonomic delimitation.

scholarly journals New Contribution to the Knowledge on the Chromosome Numbers of Turkish Cerambycidae (Coleoptera)

2021 ◽  
Vol 69 (2) ◽  
pp. 93-99
Author(s):  
Yavuz Koçak ◽  
Elmas Yağmur
Keyword(s):  
Chromosome Number ◽  
Sex Determination ◽  
Chromosome Numbers ◽  
Chromosome Count ◽  
Chromosomal Number ◽  
The Poor ◽  
Karyological Data ◽  
First Time

Information on the karyotypes of Turkish species of Cerambycidae is scanty. Our study contributes to the knowledge of the karyological data (chromosomal number and mechanism of sex determination) of five Turkish longicorn beetles; karyotypes of four taxa, one endemic, are described for the first time and for the remaining one, Purpuricenus budensis (Götz, 1783), the previously published chromosome count is confirmed. The chromosome number of Purpuricenus desfontainii inhumeralis Pic, 1891 and Purpuricenus budensis (Götz, 1783) (Cerambycinae, Trachyderini) was found to be 2n = 28 (13 + Xyp); Clytus rhamni Germar, 1817 and Plagionotus floralis (Pallas, 1773) (Cerambycinae, Clytini) 2n = 20 (9 + Xyp); and the endemic Dorcadion triste phrygicum Peks, 1993 (Lamiinae, Dorcadionini) 2n = 24 (11 + Xyp). In view of the paucity of data available until now, our study is important for both to improve the poor karyological knowledge of Turkish Cerambycidae and to provide an incentive for other researchers.

CYTOTAXONOMY OF BOMBYLIIDAE (DIPTERA)

1973 ◽  
Vol 15 (1) ◽  
pp. 21-37 ◽  
Author(s):  
J. W. Boyes ◽  
G. E. Shewell
Keyword(s):  
Sex Chromosomes ◽  
Chromosome Numbers ◽  
Total Complement ◽  
Variable Group

The karyotypes of 34 species of Bombyliidae are described, some in greater detail than others. It is suggested that two subfamilies, the Bombyliinae (for Homoeophthalmae) and Anthracinae (for Tomophthalmae) be recognized. In the Bombyliinae, one species has 2n = 8, one 2n = 10, three 2n = 12 and one 2n = 14. In the Anthracinae, two species have 2n = 10, four 2n = 12, six 2n = 14, three 2n = 16 and thirteen 2n = 18. Seventeen complements of Bombyliinae averaged 41.4 μ in total complement length (TCL) and thirtyeight of Anthracinae averaged 46.6 μ; so the 55 complements of the Bombyliidae averaged 44.9 μ in TCL, the complements with lower chromosome numbers averaging less than those with higher numbers. Thus Bombyliinae species have lower chromosome numbers and shorter complements than Anthracinae species which tend to have longer metacentric sex chromosomes. Thus both morphologically and karyotypically the Bombyliinae appear to be more advanced whereas the Anthracinae are a more primitive but highly variable group of species.

Chromosome studies on African plants. 9. Chromosome numbers in Ehrharta (Poaceae: Ehrharteae)

Bothalia ◽  
1989 ◽  
Vol 19 (1) ◽  
pp. 125-132 ◽  
Author(s):  
J. J. Spies ◽  
E. J. L. Saayman ◽  
S. P. Voges ◽  
G. Davidse
Keyword(s):  
Chromosome Number ◽  
Ploidy Level ◽  
Chromosome Numbers ◽  
Basic Chromosome Number ◽  
B Chromosomes ◽  
Basic Chromosome ◽  
Cytogenetic Studies ◽  
African Plants ◽  
First Time

Cytogenetic studies of 53 specimens of 14 species of the genus  Ehrharta Thunb. confirmed a basic chromosome number of 12 for the genus. Chromosome numbers for 13 species are described for the first time. The highest ploidy level yet observed in the genus (2n = lOx = 120) is reported for E. villosa var.  villosa. B chromosomes were observed in several specimens of four different species.

A contribution to the taxonomy of the genus Rhaponticoides (Asteraceae, Cardueae)

Phytotaxa ◽  
2019 ◽  
Vol 422 (1) ◽  
pp. 9-32 ◽  
Author(s):  
KAZEM NEGARESH
Keyword(s):  
Chromosome Numbers ◽  
Full Description ◽  
New Combinations ◽  
First Time

A taxonomic synopsis of the genus Rhaponticoides is presented. Rhaponticoides kultiassovii, R. lasiopoda, R. phyllopoda, R. androssovii, R. gontscharovii, R. alaica, R. modesti, R. ruthenica var. bipinnatifida, R. sect. Vicentinae, R. sect. Africanae, R. sect. Turkestanicae and R. sect. Aralocaspicae are proposed as new combinations. Full description for R. sect. Vicentinae, R. sect. Africanae, R. sect. Turkestanicae and R. sect. Aralocaspicae and a key for all sections are presented for the first time here. My previous descriptions of R. sect. Iranicae and R. sect. Ruthenicae are revised. Two names, R. kultiassovii and R. lasiopoda, are typified. In addition, type details, full descriptions, morphological comparisons, distribution and habitat of transferred taxa are given. Finally, a new list of species of the genus Rhaponticoides with their heterotypic synonyms, geographical distributions and chromosome numbers is provided.

Chromosome numbers in Impatiens (Balsaminaceae)

1984 ◽  
Vol 62 (12) ◽  
pp. 2630-2635 ◽  
Author(s):  
A. E. Zinov'eva-Stahevitch ◽  
W. F. Grant
Keyword(s):  
Chromosome Number ◽  
Chromosome Numbers ◽  
First Record ◽  
Hybrid Origin ◽  
Putative Hybrid ◽  
South Indian ◽  
First Time

Chromosome numbers were determined for 44 taxa of Impatiens. Ten of these are reported for the first time, of which one is the first record for a species native to Borneo. Chromosome numbers ranged from n = 3 to n = 24. Three new dysploid cytotypes were observed. A chromosome number of n = 17, previously recorded only from Thailand and Malaysia, was found in a South Indian taxon whose putative hybrid origin is discussed. The frequency of the different chromosome numbers occurring in the genus (n = 3 to n = 33) is summarized and dysploidy and polyploidy are discussed.

scholarly journals Circumnutation in the growth of Chara rhizoids

2014 ◽  
Vol 58 (2) ◽  
pp. 163-177 ◽  
Author(s):  
Janina Dąbrowska
Keyword(s):  
Chromosome Numbers ◽  
Tetraploid Form ◽  
First Time ◽  
Chara Rhizoids

The chromosome numbers of 24 species of <em>Achillea L. </em>were determined, among them 4 for the first time <em>(A. chamaemelifolia, A. sulphurea, A. teretifolia, A. vermicularis). </em>A tetraploid form of <em>A. lingulata </em>was found for the first time. The occurrence of di- and tetraploid forms <em>of A. crithmifolia </em>and <em>A. setacea </em>is confirmed as are tetraploid forms of <em>A. asiatica </em>and <em>A. sibirica. </em>Attention is drawn to 7 species of <em>Achillea L. </em>occurring in two forms, di- and tetraploid, and the significance of this fact is discussed.

scholarly journals Molecular cytogenetics of Hedysarum gmelinii Ledeb. and H. setigerum Turcz. (Fabaceae) from populations of Southern Siberia

2021 ◽  
Vol 20 (1) ◽  
pp. 517-519
Author(s):  
O. Yu. Yurkevich ◽  
T. E. Samatadze ◽  
I. Yu. Selyutina ◽  
S. A. Zoshchuk ◽  
A. V. Amosova ◽  
...  
Keyword(s):  
Chromosome Numbers ◽  
Related Species ◽  
Karyotype Analysis ◽  
Molecular Cytogenetics ◽  
5S Rdna ◽  
Chromosome Morphology ◽  
Closely Related Species ◽  
Southern Siberia ◽  
Close Relationship ◽  
First Time

For the first time, a comparative karyotype analysis of closely related species Hedysarum gmelinii andH. setigerum (Hedysarum section Multicaulia) grown in Southern Siberia, has been performed by molecular cytogeneticmarkers. Chromosome numbers in karyotypes of these species were specified – 2n = 4х = 32. In some accessions, additionalB chromosomes were revealed. FISH analyses indicated high similarities in chromosome morphology and also patternsof chromosomal distributions of 45S and 5S rDNA clusters in karyotypes of H. gmelinii and H. setigerum, which confirmsthe close relationship between their genomes.

scholarly journals Determination of somatic and sex chromosomes of three Egyptian birds species using cytogenetic analysis

Genetika ◽  
2017 ◽  
Vol 49 (1) ◽  
pp. 285-295 ◽  
Author(s):  
A.H. Abu-Almaaty
Keyword(s):  
Sex Chromosomes ◽  
Chromosome Numbers ◽  
Related Species ◽  
Cytogenetic Analysis ◽  
Morphometric Measurement ◽  
Evolutionary Patterns ◽  
Taxonomic Relationships ◽  
Corvus Ruficollis

Study of karyotypes has been revealing important information on the taxonomic relationships and evolutionary patterns in various groups of birds. Karyotypes analysis and morphometric measurement of the chromosomes of three birds species of Geopelia cuneata (Columbiformes), Oriolus oriolus and Corvus ruficollis (Passeriformes) and their karyological have been studied. The diploid chromosome numbers of three species were, 2n=72, 2n=80 and 2n =80 respectively. The karyotypes of three species were different. The somatic and sex chromosomes and karyotypes of three species discussed and compared with other related species in the present study.

scholarly journals Chromosome numbers in some alien plant species of Novosibirsk Region: post II

Turczaninowia ◽  
2021 ◽  
Vol 24 (2) ◽  
pp. 12-18
Author(s):  
Elena Yu. Zykova ◽  
Tatyana V. Pankova (An’kova)
Keyword(s):  
Alien Species ◽  
Plant Species ◽  
Chromosome Numbers ◽  
General Distribution ◽  
Alien Plant Species ◽  
Alien Plant ◽  
Nepeta Cataria ◽  
Novosibirsk Region ◽  
First Time

Chromosome numbers (2n) for 12 alien species (Apiaceae, Asteraceae, Brassicaceae, Campanulaceae, Fabaceae, Lamiaceae, Malvaceae, Onagraceae, Poaceae, Polygonaceae) from the Novosibirsk Region are given. For the first time for Russia, the number of chromosomes of Xanthogalum purpurascens (2n = 22) is given, for Siberia – Nepeta cataria (2n = 34), Malva pusilla (2n = 42) and Koenigia weyrichii subsp. weyrichii (2n = 20). For all studied species, short information on the general distribution and dispersal in the Novosibirsk Region, literature data on the number of chromosomes from the territory of Russia are presented.

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