British-isles
Guides
Allacma fusca
Allacma fusca is a large springtail species endemic to western Continental Europe and the British Isles. Adults reach approximately 3.5 mm in length and inhabit moist terrestrial environments, particularly among leaf litter in surface soil layers. The species has been studied for its physiological tolerance to elevated carbon dioxide levels compared to deeper-soil springtails.
Haliplus apicalis
Haliplus apicalis is a species of water beetle in the family Haliplidae, first described by Thomson in 1868. It is distributed across the British Isles and northwestern Europe, with records also indicating presence in North America. The species belongs to a genus of small aquatic beetles commonly known as crawling water beetles.
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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