Cytogenetic Studies in Diplopoda.

Comparative cytogenetics in different populations of the cavernicolous diplopod Pseudonannolene strinatii (Diplopoda, Pseudonannolenidae)

“…These present high amounts of the constitutive heterochromatin, about 65% of the diploid genoma of the species, a fact already observed in this and other species of other orders (Vitturi et al, 1997;Fontanetti et al 2002;Campos & Fontanetti, 2004;2005;Souza et al, 2005;Godoy et al, 2008). Pairs 5 and 6 of the individuals of the Laboratório Cave and pairs 4 and 5 of Jeremias Cave are heteromorphic based on C-banding.…”

“…Despite the increasing interest in Diplopoda cytogenetic in the last years, it has still not been explored very much and consequently little is known about it (Fontanetti et al, 2002). White (1979) considers the Diplopoda conservative with regard to karyotype evolution in general and adds that it is necessary to know what types of chromosomic polymorphisms exist in the group and which types of chromosomic rearrangements have occurred in the evolution of its karyotypes.…”

Chromosomal characterization of Pseudonannolene strinatii (Spirostreptida, Pseudonannolenidae)

“…For the seven species of Pseudonannolene studied cytogenetically, four show a chromosome number of 2n=16 (FONTANETTI et al, 2002). It is possible to speculate that the basic diploid number for this genus is in fact 2n=16.…”

“…FONTANETTI et al (2002) recorded seven species of Pseudonannolene cytogenetically studied and although cytogenetic studies in diplopods have increased considerably during recent years, only about 80 species of millipedes have been studied so far, which is still a small number when compared to the 10,500 species described for this group.…”

High content of constitutive heterochromatin in two species ofPseudonannolene(Diplopoda)

“…The number of millipede species that have been studied cytogenetically is small (about 82 species) in relation to the large amount of species that belong to this group. The lack of data is greatly due to the difficulties in obtaining mitotic chromosomes, which hinder the application of modern cytogenetical techniques (Fontanetti et al 2002).…”