Abstract
The distribution for each species of freshwater leech (Hirudinoidea) is described and discussed on a province or territory basis. The hosts for those species recorded as temporary parasites are listed. One hundred and eight new species records are listed including 28 records new to the province or territory. Percymoorensis lateralis is recorded in Canada for the first time, and the first record of freshwater leeches in the Yukon made.

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