Leucorrhinia pectoralis can coexist with fish (Odonata: Libellulidae)

The Palaearctic libellulid Leucorrhinia pectoralis is generally considered to be a species inhabiting fish-free water bodies. Yet, a long-term monitoring study of 38 water bodies in NE Germany resulted in 16 species offish being recorded in reproductive habitats of L. pectoralis, with Rutilus rutilus and Carassius carassius as the most numerous and widespread fish species.

Five new species of Orthemis from South America (Odonata: Libellulidae)

Five new species of the levis-group of Orthemis, O. cinnamomea (holotype ♂ in USNM: Peru, Madre de Dios Department, Explorer’s Inn on Río Tambopata, 12°50′S, 69°17′W, 300 m, 23 vii 2002, leg. D. Paulson & N. Smith), O. coracina (holotype ♂ in USNM: Ecuador, Sucumbios Province, Limoncocha, 00°24′S, 76°36′W, 300 m, 23 vii 1977, leg.

Morphological differences in the ovary of Libellulidae (Odonata)

All female Odonata have been assumed to produce oocytes continuously during their mature life span. However, a recent study of ovariole orientation and development led to the suggestion that Libellulidae are divided into two groups of species, one with continuous, the other with stepwise oocyte production. To find more evidence of this division, we compared…

Trithemis morrisoni sp. nov. and T. palustris sp. nov. from the Okavango and Upper Zambezi Floodplains previously hidden under T. stictica (Odonata: Libellulidae)

During the course of a population genetic study of Trithemis stictica that included sites in Namibia, Kenya, Tanzania, Ethiopia, Botswana and Zambia, two undescribed libellulid species were discovered in the Okavango and Upper Zambezi Floodplains. These were both previously identified as T. stictica. We describe the two species, T. morrisoni sp. nov. (holotype ♂: Namibia,…

Location and seasonal differences in adult dragonfly size and mass in northern Mississippi, USA (Odonata: Libellulidae)

Size and mass are often uniformly related within individuals and populations, but the relationship may vary in time or space. I asked whether isolated adult dragonfly populations within the same environmental context (climate, physiography, ecoregion) differ in both size and mature mass, and whether earlier emerging dragonflies are both larger and heavier on average. Differences…

Habitat requirements of Orthetrum coerulescens and management of a secondary habitat in a highly man-modified landscape (Odonata: Libellulidae)

Due to the destruction of its primary habitats, the West Palaearctic libellulid Orthetrum coerulescens has suffered much decline in central Europe. However, at the regional scale it has survived in a variety of secondary habitat, such as draining ditches. In order to find adequate measures for its conservation and promotion, habitat use and habitat recognition…