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Schematic illustration of basic morphology of bacterial organs from each of three groups of blood-feeding leeches in the family Glossophoniidae. (A) Placobdella sp. with blind-end sacs; (B) Placobdelloides sp. with small bacteriocytes encircling the leech esophagus; (C) Haementeria sp. with large, globular sacs joined to the esophagus via thin ducts.
