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Hematophagous leeches express a broad variety of secretory factors in their salivary glands; among them are hirudins, inhibitors of blood coagulation, and decorsins/ornatins, inhibitors of platelet aggregation. Here, we describe the identification and molecular and functional characterization of putative hirudins and decorsins/ornatins in two leech species of American origin, Limnobdella mexicana and Haementeria vizottoi. The leech species represent two orders of leeches, the proboscis-bearing Rhynchobdellida and the non-proboscis-bearing Arhynchobdellida. Members of the hirudin superfamily, such as hirudins or decorsins/ornatins, are described for the first time in the genus Haementeria. Both species expressed very potent inhibitors of platelet aggregation, but only the putative hirudins of L. mexicana displayed high thrombin-inhibitory potency, whereas the putative hirudin of H. vizottoi turned out to be a hirudin-like factor. The results of our study provide new insights into the evolutionary background of the blood-sucking lifestyle in leeches.