IUCN threat status:

Not evaluated

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Introduction

This is a large genus of over 1200 described species. Most species are found in north temperate regions, although two smaller centers of diversity exist in the southern hemisphere (the Andes mountains of South America, as well as New Zealand).

Adults are common, small predators and scavengers along bodies of water, from rapidly flowing mountain streams to lowland ponds. Several species living in more xeric conditions, including deserts.

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