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

100%

Lachowska D. , Holecova M.

nr 3-4

111-114

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.

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

100%

Rozek M. , Holecova M.

tom 48

nr 1-2

33-35

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.

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

86%

Lachowska D.

nr 3-4

219-225

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.

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

86%

Holecova M. , Rozek M. , Lachowska D.

nr 1-2

25-29

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.

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

86%

Lachowska D.

nr 3-4

111-113

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.

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

86%

Holecova M. , Lachowska D. , Karagyan G.

tom 50

nr 1-2

9-12

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.

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

72%

Holecova M. , Rozek M. , Karagyan G.

tom 48

nr 1-2

25-27

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.