This work deals with the comparative cytogenetic analysis of four Neotropical Elateridae species and reviews nucleolar organizer region (NOR) patterns on Coleoptera chromosomes, for first time. The characterization Conoderus malleatus (Conoderini), Pyrearinus candelarius, Pyrophorus divergens punctatissimus (Pyrophorini) was accomplished through study mitotic meiotic cells submitted to standard (Giemsa) differential staining [silver impregnation GC-specific chromomycin A3 (CMA3) plus...

The order Scorpiones is one of the most cytogenetically interesting groups within Arachnida by virtue combination chromosome singularities found in 59 species analyzed so far. In this work, mitotic and meiotic chromosomes 2 family Bothriuridae were detailed. This occupies a basal position superfamily Scorpionoidea. Furthermore, review cytogenetic data all previously studied scorpions presented. Light microscopy analysis showed that Bothriurus araguayae rochensis possess low diploid numbers...

Within the order Scorpiones, parthenogenetic mode of reproduction has been described for 11 species, 6 which belong to genus Tityus. In this work, an investigation chromosome characteristics 2 populations Tityus serrulatus, first scorpion species known be thelytokously parthenogenetic, is described. An analysis 40 individuals revealed holocentric chromosomes large, medium, and small sizes invariable diploid number 2n = 12. addition conserved macrokaryotype structure, specific regions also...

Karyotype evolution of Oxyopidae spiders number chromosome and change the sex system to X type; however, certain species retain ancestral constitution 2n = 26+X1X2.The most remarkable karyotype differentiation occurred in O. salticus studied here, which showed lowest diploid ever observed second registered for Entelegynae spiders.

Buthid scorpions exhibit a high variability in diploid number within genera and even species. Cytogenetically, Buthidae differs from other families of Scorpiones based on its low numbers, holocentric chromosomes, complex chromosomal chains, which form during meiosis. In this study, we analyzed the distribution 45S ribosomal DNA (rDNA) genes mitotic meiotic chromosomes seven buthid species belonging to Rhopalurus Tityus with ultimate goal elucidating chromosome organization these scorpions....

Scorpions represent an intriguing group of animals characterized by a high incidence heterozygous chromosomal rearrangements. In this work, we examined six species Tityus (Archaeotityus) from Brazilian fauna with particular focus on elucidating the rearrangements responsible for intraspecific variability diploid number and presence long chains in meiosis. To access any interpopulation diversity, also studied individuals four representing distinct localities. Most demonstrated polymorphism...

The present study elevates the number of cytogenetically analyzed ctenid species and genera from two to eight six, respectively, presenting comparisons between chromosomal data obtained phylogenetic hypothesis proposed in literature. Six presented 13 autosomal pairs, exhibiting either X1X2O (Ctenus ornatus, Ctenus sp., Parabatinga brevipes Phoneutria nigriventer) or X1X2X3O sex chromosome systems (Nothroctenus sp. Viracucha andicola). Asthenoctenus borellii showed 2n ♂ = 20 X1X2O. In all...

Abstract The first cytogenetic analysis of fireflies from Brazilian fauna was carried out in this work. investigation two species the subfamily Lampyrinae, Aspisoma maculatum and Photinus sp. (aff. pyralis ), showed diploid number 2 n = 19 an X0 sex determination system males. These observations are similar to those already described for all Lampyrinae previously studied. In contrast, Bicellonycha lividipennis (Photurinae) revealed karyotype 16 + neoXY, which has not yet been registered any...

Theridiidae is a derived family within the Araneoidea clade. In contrast to closely related groups, 2n(male) = 20+X1X2 with acro/telocentric chromosomes most widespread karyotype among theridiid spiders. this work, cytogenetic analysis of Argyrodes elevatus revealed original chromosome features different from those previously registered for Theridiidae, including presence 20+X meta/submetacentric chromosomes. Most individuals Nesticodes rufipes showed conserved characteristics. However, one...

Testicular cells of 4 buthid scorpions, <i>Rhopalurus agamemnon</i> (2n = 28), <i>R. rochai</i> <i>Tityus bahiensis</i> 6), and <i>T. fasciolatus</i> 14), which show different types chromosomal configurations in meiosis I, were subjected to cellular microspreading order (1) obtain knowledge about the organization behavior synaptonemal complex (SC), (2) acquire data mechanisms responsible for inter- intraindividual variation within Buthidae....

The family Filistatidae is considered sister to Synspermiata or Hypochilidae. Cytogenetic knowledge of this could be useful for understanding the mechanism chromosome evolution that has occurred within group. In work, two filistatid species belonging distinct subfamilies, Kukulcania hibernalis (Hentz, 1842) (Filistatinae) and Misionella mendensis (Mello-Leitão, 1920) (Prithinae), were investigated using standard differential staining. Analysis mitotic meiotic cells revealed diploid 2n♂ = 25...

We analyzed mitotic and meiotic cells of a Brazilian amblypygid, Heterophrynus longicornis, using conventional molecular cytogenetic techniques (Giemsa staining, C-banding, Ag-NOR, FISH with rDNA probe).This is the first study that focuses solely on amblypygid chromosomes; it was undertaken to add data knowledge this group contribute understanding chromosome evolution in Arachnida.We found 2n = 66 for male female individuals, monocentric chromosomes, absence morphologically differentiated...

The family Sicariidae comprises the genera Hexophthalma, Sicarius and Loxosceles. This latter is subdivided in eight monophyletic groups based on genitalia morphology molecular analyses: amazonica, gaucho, laeta, spadicea (South America); reclusa (North rufescens (Mediterranean); spinulosa vonwredei (Africa). In Brazil, genus Loxosceles represented by 50 species. mitotic meiotic characteristics of species were analyzed order to discuss chromosome evolution, as well correspondence between...

Nephilid systematics has been subject to several changes in the last years, and use of non-classical characters could be useful for evolutionary considerations. In this study, we analyzed mitotic chromosomes two nephilid spiders, Nephila clavipes sexpunctata, using standard staining, silver nitrate impregnation C-banding techniques, aiming discuss chromosomal similarities Nephilidae Tetragnathidae, chromosome evolution within Nephilingis. The basic karyotype characteristics observed these...

fi nding was corroborated by a phylogenetic study using molecular data (Gómez-Zurita et al., 2008).Cytogenetically, only 117 Cassidinae species belonging to 13 tribes have been investigated date (for revision see De Julio 2010).The tortoise beetles are considered as group with conserved karyotype, in which approximately 52% of the analyzed showed 2n = 16 + Xy p , metacentric and/or submetacentric chromosomes (De 2010).However, cytogenetic records also demonstrated that diploid numbers can...

Among the Opiliones, species of suborders Cyphophthalmi, Eupnoi, Dyspnoi and Laniatores have shown very diverse diploid chromosome numbers. However, only certain Eupnoi exhibit XY/XX ZZ/ZW sex systems. Considering scarcity karyotypical information absence structurally identifiable chromosomes in suborder Laniatores, we decided to analyse bivalents Discocyrtus pectinifemur (Gonyleptidae) identify possible differences. Testicular cells examined under light microscopy showed a high number, 2n =...

Even though less than 2% of pholcid species have been karyotyped, previous studies documented a wide diversity diploid numbers and sex chromosome systems. Here, we increase the number native Brazilian cytogenetically investigated from three to eight discuss implications evolution in this group. The analyzed here share X0/XX system biarmed chromosomes, but vary numbers, i.e., 2n♂ = 17 Mesabolivar spinulosus (Mello-Leitão, 1939) togatus (Keyserling, 1891), 15 Carapoia sp., 9 Micropholcus piaui...

Within the araneomorph lineage Entelegynae, “Higher lycosoids” (“True Lycosoids” or Lycosoidea s.s.) is one of major clades varying in its composition based on several conflicting phylogenetic hypotheses. So far, only a few species have been studied cytogenetically. In this work, chromosomes senoculid spider were investigated for first time, along with cytogenetic analysis six families Lycosidae and Trechaleidae. Mitotic metaphase cells lycosid revealed 2n♂ = 18 X0 Hogna sternalis (Bertkau...