Precambrian-shield
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Crangonyx richmondensis
Ellis Bog Crangonyctid
A small freshwater amphipod crustacean endemic to North America. The species exhibits an annual life cycle with distinct seasonal breeding patterns. Populations are restricted to specific freshwater habitats with particular substrate and vegetation characteristics. Two subspecies have been described: C. r. richmondensis and C. r. laurentianus, with the latter studied in detail in Algonquin Park, Ontario.