Long-life-cycle
Guides
Chrysops nigripes
Chrysops nigripes is a species of deer fly in the family Tabanidae, first described by Zetterstedt in 1838. Larval development has been documented in subarctic peatland environments, where the species occupies aquatic to semi-aquatic microhabitats. Life cycle completion at subarctic latitudes may require 7–8 years, indicating exceptionally slow growth rates compared to temperate populations of related species.
Pacifastacus leniusculus
Signal Crayfish
The signal crayfish is a large North American freshwater crayfish introduced to Europe in the 1960s to replace declining native fisheries. It has become one of the most ecologically impactful invasive decapods in Europe, outcompeting native crayfish and serving as a carrier of crayfish plague (Aphanomyces astaci). The species establishes self-sustaining populations rapidly, with six age cohorts documented within a few years of introduction. It shows sex- and size-specific coloration patterns, with males displaying more saturated and brighter ventral claw surfaces than females, suggesting a role in intraspecific communication.
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Giant Stoneflies, Salmonflies
Pteronarcys is a genus of giant stoneflies in the family Pteronarcyidae, commonly known as salmonflies. The genus comprises approximately 8 described species distributed across North America and Far Eastern Russia. These are among the largest stoneflies, with nymphs reaching substantial sizes in lotic freshwater habitats. Life cycles are notably long, ranging from 1 to 5 years depending on species and thermal conditions, with multiple larval diapause stages and temperature-dependent egg development documented in several species.