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Genus Acropora
- coelenterate genus of order Madreporaria, including staghorn corals
Genus Beroe
- coextensive with the class Nuda
Genus Sagitta
- chief genus of Chaetognatha including the largest arrowworms
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