Key to common families of leeches in the Niagara region

2a) Five pairs of eyes forming parabolic arch. Large body size (can be over 100 mm in length).
Blood sucking. (rare) HIRUDINIDAE




2b) Eyes, 0, 3 or 4 pairs. Ribbon-like body generally dark coloured and of moderate size. (common)
ERPOBDELLIDAE




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