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Genus Spadella
- marine worms resembling the sagittas but with a broader body and only one pair of lateral fins
Genus Schistosoma
- type genus of the family Schistosomatidae: blood flukes
Genus Taenia
- type genus of the family Taeniidae: tapeworms
Genus Ascaris
- type genus of the family Ascaridae: roundworms with a three-lipped mouth
Genus Ascaridia
- roundworm having a preanal sucker