Niagara Region Keys: Common Macroinvertebrates Common Families of Worms in the Niagara Region Common Families of Leeches in the Niagara Region Common Families of Bivalves in the Niagara Region Common Families of Snails in the Niagara Region Common Families of Crustaceans in the Niagara Region Common Families of Insects in the Niagara Region