Aquatic-habitats
Guides
Hexacola
Hexacola is a genus of small parasitoid wasps in the family Figitidae, subfamily Eucoilinae. These wasps are known primarily as parasitoids of dipteran hosts, particularly shore flies (Ephydridae) and eye gnats (Chloropidae). The genus includes species with both sexual and parthenogenetic reproduction, and some have been studied for potential biological control applications.
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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