GEOGRAPHICAL AND GENETIC STRUCTURE OF LIFE‐HISTORY VARIATION IN MILKWEED BUGS (HEMIPTERA: LYGAEIDAE: ONCOPELTUS )

Development and determination of hairs and bristles in the milkweed bug, Oncopeltus fasciatus (Lygaeidae, Hemiptera).

The term' organule' is proposed as an English equivalent for the German word' Kleinorgan'. The different organules on the third sternite of Oncopeltus are described: larvae possess innervated bristles and special sensilla termed 'chemosensilla', whereas the adult develops, in addition, a dense population of non-innervated hairs. The hairs, bristles and 'chemosensilla' each develop from mother c...

Absence of ribosomal DNA amplification in the meroistic (telotrophic) ovary of the large milkweed bug Oncopeltus fasciatus (Dallas) (Hemiptera: Lygaeidae)

In the typical meroistic insect ovary, the oocyte nucleus synthesizes little if any RNA. Nurse cells or trophocytes actively synthesize ribosomes which are transported to and accumulated by the oocyte. In the telotrophic ovary a morphological separation exists, the nurse cells being localized at the apical end of each ovariole and communicating with the ooocytes via nutritive cords. In order...

Na+/K+-ATPase resistance and cardenolide sequestration: basal adaptations to host plant toxins in the milkweed bugs (Hemiptera: Lygaeidae: Lygaeinae).

Despite sequestration of toxins being a common coevolutionary response to plant defence in phytophagous insects, the macroevolution of the traits involved is largely unaddressed. Using a phylogenetic approach comprising species from four continents, we analysed the ability to sequester toxic cardenolides in the hemipteran subfamily Lygaeinae, which is widely associated with cardenolide-producin...

04-P012 Germ line specification in the milkweed bug, Oncopeltus fasciatus (Hemiptera)

The body axes of many animals are initially patterned by the asymmetric distribution of maternal mRNAs and proteins in the oocyte. In Drosophila, these maternal factors are synthesized by the 15 nurse cells that connect to each oocyte within the ovary. However, insect ovaries fall into three anatomical categories, of which Drosophila represents only one. The telotrophic meroistic ovaries of the...

Development of Resistance in Southern Chinch Bugs (hemiptera: Lygaeidae) to the Insecticide Bifenthrin