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Genus Ascaridia
- roundworm having a preanal sucker
Genus Tylenchus
- type genus of the family Tylenchidae
Genus Dracunculus
- type genus of the family Dracunculidae
- tuberous herbaceous perennials: dragon arum
Genus Branchiobdella
- type genus of the Branchiobdellidae: a small worm that lives on the gills or surface of a crayfish attached by a sucker
Genus Terebella
- type genus of Terebellidae; tube-forming marine polychete worms with many filamentous tentacles
Genus Polycirrus
- genus of soft-bodied polychete marine worms
Genus Hirudo
- type genus of the family Hirudinidae