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1

Evidence of B-chromosomes in the karyotype of Barypeithes pellucidus Boheman 1834 (Coleoptera, Curculionidae, Entiminae) from central Europe

100%
Holecova M., Rozek M., Lachowska D.
Folia Biologica
|
2005
|
vol. 53
|
issue 1-2
65-68
EN
B-chromosomes were observed in spermatogonial mitotic metaphases, meiotic metaphases I and II of Barypeithes pellucidus from one population in Slovakia. The number of B-chromosomes ranged from one to six per cell and they paired with the sex heterochromosomes in the first meiotic metaphase and rarely with the autosomes. In metaphase I one B-chromosome was always associated with X chromosome forming a tripartite complex. The XyBp was easily recognizable as a complex of three chromosomes in a parachute association The size of the B-chromosomes was approximately the same or a little smaller than that of the y heterochromosome which was the smallest element of the regular chromosome set. Their staining intensity seems to be similar to that of the autosomes and sex chromosomes, respectively. The behaviour of B-chromosomes during mitosis and meiosis in weevils is briefly discussed.
2

Karyotypic data on weevils (Coleoptera, Curculionidae)

100%
Lachowska D., Holecova M., Rozek M.
Folia Biologica
|
1998
|
vol. 46
129-136
EN
The results of karyological studies of Curculionidae published since 1978 are summarized. Chromosome complements for 189 species are presented. Diploid chromosome number 2n=22, and meioformula n%=10+Xyp is the most characteristic chromosome number of weevils occuring in more than one-third of species examined karyologically. In Curculionidae there is a clear tendency towards symmetrization of karyotypes.
3

Karyological investigations on seven weevil species (Coleoptera, Curculionidae).

88%
Lachowska D., Holecova M.
Folia Biologica
|
2000
|
vol. 48
|
issue 3-4
111-114
EN
Karyological studies were carried out on seven Palaearctic weevils. The following chromosome numbers were found in individual species, i.e. Otiorhynchus niger (F.), Phyllobius viridearis (Laich.), Phyllobius scutellaris Redt., Phyllobius calcaratus (F.), Polydrusus cervinus (L.), and Brachyderes incanus (L.) 2n=22, n%=10+Xyp, in Lixus elegantulus (Boh.) 2n=22, n%=21+Xyp. The heterochromosomes of all the examined species form, in the first meiotic metaphase, a typical parachute bivalent.
4

Heterochromatic banding patterns on chromosomes of twelve weevil species (Insecta, Coleoptera, Curculionidea: Apionidae, Curculionidae)

88%
Holecova M., Rozek M., Lachowska D.
Folia Biologica
|
2002
|
vol. 50
|
issue 3-4
129-134
EN
The C-banding patterns of twelve weevil species are presented. The obtained results confirm the existence of two groups of species: with a small or large amount of heterochromatin in the karyotype. The first group comprises seven species (Apionidae: Holotrichapion pisi; Curculionidae: Phyllobius urticae, Ph. pyri, Ph. maculicornis, Tanymecus palliatus, Larinodontes turbinatus, Cionus tuberculosus). In weevils with a small amount of heterochromatin, tiny grains on the nucleus in interphase are visible, afterwards in mitotic and meiotic prophase appearing as dark dots. The absence of C-bands does not indicate a lack of heterochromatin but heterochromatic regions are sometimes so small that the condensation is not visible during the cell cycle. The second group comprises five species (Otiorhynchus niger, O. morio, Polydrusus corruscus, Barypeithes chevrolati, Nedyus quadrimaculatus) which possess much larger heteropicnotic parts of chromosomes visible during all nuclear divisions. The species examined have paracentromeric C-bands on autosomes and the sex chromosome X, except for Otiorhynchus niger, which also has an intercalary bands on one pair of autososomes. All the species examined differ in the size of segments of constitutive heterochromatin. The y heterochromosome is dot-like and wholly euchromatic in all the studied species.
5

Cytogenetic investigations on seven Palaearctic weevil species (Coleoptera, Curculionidae)

88%
Lachowska D., Rozek M., Holecova M., Karagyan G.
Folia Biologica
|
2001
|
vol. 49
|
issue 1-2
49-52
EN
Cytogenetic investigations were carried out on seven species of bisexual weevils from five subfamilies. The following numbers of chromosomes were found in individual species: 2n=22, n_=10+Xyp in Ptochus porcellus Boh. (Otiorhynchinae); 2n=40, n_=19+Xyp in Larinodontes turbinatus Gyll. (Cleoninae); 2n=26, n_=12+Xyp in Curculio pellitus (Boh.) (Curculioninae); 2n=30, n_=14+Xyp in Acalles camelus (F.), Acalles echinatus (Germ.), Acalles hypocrita Boh. (Cryptorhynchinae), and 2n=40, n_=19+Xyp in Cionus hortulanus (Foucr.) (Mecininae). The heterochromosomes of all the examined species form, in the first meiotic metaphase, a parachute bivalent. The chromosome number and sex determining system of six species and two genera are described for the first time.
6

Chromosome complement and meiosis in eight bisexual species of weevil (Curculionidae, Coleoptera)

88%
Holecova M., Rozek M., Lachowska D.
Folia Biologica
|
1995
|
vol. 43
|
issue 1-2
41-49
EN
Karyological investigations were carried out on eight species of bisexual weevil belonging to five subfamilies, viz. - Otiorhynchinae, Brachyderinae, Cleoninae, Hylobiinae, Ceutorhynchinae.
7

C-banding patterns in chromosomes and sperm of Strophosoma capitatum (De Geer, 1775) (Coleoptera: Curculionidae, Brachyderinae)

88%
Rozek M., Holecova M.
Folia Biologica
|
2000
|
vol. 48
|
issue 1-2
33-35
EN
An analysis was made of the C-banded karyotype of Strophosoma capitatum (Deg.). The results indicate that the chromosome number is 2n=22 and n%=10+Xyp. The examined karyotype shows a pericentromeric position of constitutive heterochromatin in all autosomes. The shorter arm of the X chromosome is heterochromatic while the y chromosome is wholly euchromatic. Successive stages of spermatogenesis were analysed.
8

Karyotypes and chromosome rearrangements in two tribes of weevils (Coleoptera, Curculionidae: Sciaphilini and Brachydrini)

75%
Lachowska D.
Folia Biologica
|
2008
|
vol. 56
|
issue 3-4
219-225
EN
A description of karyotypes in two tribes of weevils, Sciaphilini and Brachyderini, was carried out with a discussion on the main trends of chromosomal evolution occurring in these groups. Some important cytological characteristics, such as chromosome morphology, sex determination type, pattern of male meiosis, B chromosome occurrence, as well as C-heterochromatin, NOR localization, and fluorochrome AT and GC specific staining are presented. The chromosome numbers and morphology in the two tribes of weevils are highly conserved. With the exception of one species, all possessed a diploid number of 22 chromosomes or triploid number of 33 chromosomes. Constitutive heterochromatin was observed in the pericentromeric regions of themajority of the chromosomes. In some species, additional constitutive heterochromatin was also observed in interstitial positions. The study of meiotic cells revealed the occurrence of total synapsis between autosomes, the presence of one terminal, interstitial or two chiasmata, reductional behaviour and regular segregation of all chromosomes, as well as the formation of associations of the Xyp type in sex chromosomes. Testicular cells impregnated with silver nitrate demonstrated NORs localized on autosomes and argentophilic material in the space between the X and y chromosomes. The use of CMA3/DAPI staining showed that centromeric heterochromatin is AT-rich, whereas CMA3 bands were probably conincident with NOR sites.
9

Karyological notes on six beetle species from Armenia (Coleoptera: Tenebrionidae, Cerambycidae, Curculionidae)

75%
Holecova M., Lachowska D., Karagyan G.
Folia Biologica
|
2002
|
vol. 50
|
issue 1-2
9-12
EN
Karyotypic details were studied in males of six beetle species from three families, viz. Tenebrionidae: Dailognatha pumila Bdy. (2n=20, n male= 9+Xyp), Pachyscelis musiva Menetr. (2n=18, n male= 8+Xyp), Pimelia capito Kryn. (2n = 18, n male= 8+Xyp); Cerambycidae: Agapanthia walteri Reitt. (2n=20, n male = 9+Xyp), Agapanthia korostelevi Danilevsky (2n=20, n male = 9 + Xyp); Curculionidae: Phyllobius caucasicus Stierl. (2n = 22, n male=10+Xyp). The chromosome number and sex determining system of all beetle species are described for the first time. Evolutionary trends in karyotypes of the studied beetle groups are briefly discussed.
10

Chromosome number in nine beetle species (Coleoptera: Bruchidae, Apionidae, Curculionidae)

75%
Lachowska D., Holecov? M., Ro?ek M.
Folia Biologica
|
1998
|
vol. 46
41-46
EN
Mitotic and meiotic chromosomes were studied in nine beetle species from three families, viz. Bruchidae: Bruchus pisorum L.) (2n=34, no%=16+Xy); Apionidae: Legaricapion pisi (F.) (2n=22, n%=10+Xyp); Curculionidae: Otiorhynchus opulentus Germ., Polydrusus marginatus Steph., Polydrusus viridicinctus Gyll., Liophloeus lentus Germ., Liophloeus gibbus Boh. (2n=22, n%=10+Xyp), Larinodontes obtusus Gyll. (2n=40, n%=19+Xyp), Zacladus geranii (Payk.) (2n=28, n%=13+Xyp). In the first meiotic metaphase the heterochromosomes of eight examined species formed a typical parachute bivalent. The chromosome number and sex determining system of seven species were described for the first time.
11

Chromosome survey in seven bisexual species of weevils (Coleoptera, Curculionidae)

75%
Lachowska D.
Folia Biologica
|
1999
|
vol. 47
|
issue 3-4
111-113
EN
Karyological details were studied in males of seven weevil species. The following number of chromosomes were found in individual species: 2n=32, n_=15+Xyp in Gymnetron tetrum (F.) and Gymnetron smreczynski Fremuth, 2n=44, n_=21+Xyp in Cionus tuberculosus (Scop.), 2n=38, n_=18+Xyp in Cionus hortulanus (Geoffr.), Cionus ganglbaueri Wingelm. and Cionus nigritarsis Reitt., 2n=42, n_=20+Xyp in Cionus olivieri Rosensch. In the first meiotic metaphase the heterochromosomes of all the examined species formed a typical parachute bivalent. The chromosome number and sex determining system were described for the first time.
12

Karyological studies on six bisexual weevil species (Coleoptera, Curculionidae)

75%
Lachowska D., Holecova M., Rozek M.
Folia Biologica
|
1999
|
vol. 47
|
issue 3-4
105-110
EN
Karyological studies were carried out on six bisexual weevil species from five subfamilies, viz. ? Otiorhynchinae, Cleoninae, Curculioninae, Pissodinae, and Hylobiinae. The following chromosome numbers were found in individual species: in Peritelus leucogrammus Germ., Phyllobius cloropus (L.), and Hypera viciae (Gyll.) 2n = 22, n_ = 10+Xyp, in Curculio venosus Grav. 2n= 26, n_ = 12+Xyp, in Magdalis armigera (Foucr.) 2n = 36, n_ = 17+Xyp, in Lixus filiformis (F.) 2n = 44, n_ = 21+Xyp. The heterochromosomes of all the examined species form, in the first meiotic metaphase, a parachute bivalent. The mitoses were observed and analysed in three species. The karyotypes of Peritelus leucogrammus Germ., Phyllobius cloropus (L.), and Curculio venosus Grav. are constituted by metacentric and submetacentric chromosomes.
13

Notes on chromosome numbers and C-banding patterns in karyotypes of some weevils from Central Europe (Coleoptera, Curculionoidea: Apionidae, Nanophyidae, Curculionidae)

75%
Lachowska D., Holecova M., Rozek M.
Folia Biologica
|
2004
|
vol. 52
|
issue 1-2
61-66
EN
Chromosome numbers and C-banding patterns of sixteen weevil species are presented. The obtained results confirm the existence of two groups of species with either a small or large amount of heterochromatin in the karyotype. The first group comprises twelve species (Apionidae: Oxystoma cerdo, Eutrichapion melancholicum, Ceratapion penetrans, Ceratapion austriacum, Squamapion flavimanum, Rhopalapion longirostre; Nanophyidae: Nanophyes marmoratus; Curculionidae: Centricnemus (=Peritelus) leucogrammus, Sitona humeralis, Sitona lineatus, Sitona macularis, Sitona suturalis). In weevils with a small amount of heterochromatin, tiny grains on the nucleus during interphase are visible, afterwards appearing as dark dots during mitotic and meiotic prophase. The second group comprises four species from the curculionid subfamily Cryptorhynchinae (Acalles camelus, Acalles commutatus, Acalles echinatus, Ruteria hypocrita) which possess much larger heteropycnotic chromosome parts visible during all nuclear divisions. The species examined have pericentromeric C-bands on autosomes and on the X chromosome.
14

Karyotype analysis of three weevil species from the genera Brachysomus (Boheman, 1845) and Strophosoma Billberg, 1820 (Coleoptera, Curculionidae)

75%
Holecova M., Rozek M., Lachowska D.
Folia Biologica
|
2008
|
vol. 56
|
issue 1-2
25-29
EN
Karyotypes of three weevil species, viz. Brachysomus dispar (2n=22, n=10+Xyp), Brachysomus hirtus (3n=33, n=10+X) and Strophosoma faber (2n=22, n=10+Xyp) belonging to the tribes Sciaphilini and Brachyderini, were studied using the C-banding technique. The karyotype structures of the two bisexual and one parthenogenetic species are described for the first time. Most chromosomes are meta- or submetacentric. In the two species of the genus Brachysomus, the chromosomes resemble one another in having a rather small amount of heterochromatin restricted to the pericentromeric region, visible as dark stained blocks mainly during the early stages of nuclear division. Larger bands at mitotic metaphase and diakinesis occur only in Strophosoma faber. Geographic parthenogenesis in Brachysomus hirtus is briefly discussed.
15

Karyological notes on three weevil species from Armenia (Coleoptera, Curculionidae, Cleoninae)

63%
Holecova M., Rozek M., Karagyan G.
Folia Biologica
|
2000
|
vol. 48
|
issue 1-2
25-27
EN
Karyological studies were carried out on three Armenian weevil species from the subfamily Cleoninae. The following chromosome numbers were found in individual species: 2n = 38, n% = 18+Xyp in Menecleonus anxius (Gyllenhal, 1824), 2n=40, n% = 19+Xyp in Conorhynchus nigrivittis (Pallas, 1781) and 2n = 44, n% =21+Xyp in Lixus iridis Olivier, 1807. The heterochromosomes of all the examined species form, in the first meiotic metaphase, a typical parachute bivalent.
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