Evolutionary Potential of Parthenogenesis-Bisexual Lineages within Triploid Apomictic Thelytoky in (Flor, 1861) (Hemiptera, Psylloidea) in Fennoscandia.

A widely accepted hypothesis is that parthenogenesis is an evolutionary dead end since it is selectively advantageous in the short term only but results in lowered diversification rates. Triploid apomictic parthenogenesis might represent an exception, as in favorable environments, triploid females are able to produce rare males and diploid females. The aim of the present study was to analyze the modes of reproduction and their evolutionary implications in the parthenogenetic psyllid (Flor, 1861) from Fennoscandia.

Using functional traits and phylogeny to understand local extinction risk in dragonflies and damselflies (Odonata).

Understanding the risk of local extinction of a species is vital in conservation biology, especially now when anthropogenic disturbances and global warming are severely changing natural habitats. Local extinction risk depends on species traits, such as its geographical range size, fresh body mass, dispersal ability, length of flying period, life history variation, and how specialized it is regarding its breeding habitat. We used a phylogenetic approach because closely related species are not independent observations in the statistical tests.

The Incidence of Bacterial Endosymbiont in Bisexual and Parthenogenetic Populations of the Psyllid Genus (Hemiptera, Psylloidea).

is one of the most common intracellular bacteria; it infects a wide variety of insects, other arthropods, and some nematodes. is ordinarily transmitted vertically from mother to offspring and can manipulate physiology and reproduction of their hosts in different ways, e.g.

Description of two new species of the genus Ossiannilsson, 1970 (Hemiptera, Psylloidea) from northern Fennoscandia recognized by morphology, cytogenetic characters and barcode sequence.

Based on chromosomal, molecular and morphological analyses, two new Ossiannilsson, 1970 species are described, S. Nokkala & Ch. Nokkala, and S.

Characteristics of parthenogenesis in (Flor, 1861) (Hemiptera, Sternorryncha, Psylloidea): cytological and molecular approaches.

Characteristics of parthenogenesis in (Flor, 1861) were analyzed using cytological and molecular approaches. In all three populations studied from Finland, i.e.

Meiosis in rare males in parthenogenetic Cacopsylla myrtilli (Wagner, 1947) (Hemiptera, Psyllidae) populations from northern Europe.

For studying meiosis in males, large samples of Cacopsylla myrtilli (Wagner, 1947) (Hemiptera, Psyllidae) were collected in Norway, Sweden, Finland and northwest Russia. In addition to all-female populations, males were present in 10 out of 47 populations; still, all populations were highly female-biased, the proportion of males varying from 0.1% to 9.

Cytogenetics of the true bug infraorder Cimicomorpha (Hemiptera, Heteroptera): a review.

The Cimicomorpha is one of the largest and highly diversified infraorders of the Heteroptera. This group is also highly diversified cytogenetically and demonstrates a number of unusual cytogenetic characters such as holokinetic chromosomes; m-chromosomes; multiple sex chromosome systems; post-reduction of sex chromosomes in meiosis; variation in the presence/absence of chiasmata in spermatogenesis; different types of achiasmate meiosis. We present here a review of essential cytogenetic characters of the Cimicomorpha and outline the chief objectives and goals of future investigations in the field.

Mitotic and meiotic chromosomes in Somatochlora metallica (Cordulidae, Odonata). The absence of localized centromeres and inverted meiosis.

Spermatogonial metaphase chromosomes were examined in two dragonfly species, Somatochlora metallica (Cordulidae) and Aeshna grandis (Aeshnidae), and the behaviour of male meiotic chromosomes was studied in S. metallica. Both in S.