''Antigonaria'' is a genus of

acoel Acoela, or the acoels, is an order of small and simple invertebrates in the subphylum Acoelomorpha of phylum Xenacoelomorpha, a deep branching bilaterian group of animals, which resemble flatworms. Historically they were treated as an order of ...

s. It is the only genus in the monotypic family Antigonariidae and is represented by a single species, ''Antigonaria arenaria''.

References

Acoelomorphs Monogeneric animal families {{Xenacoelomorpha-stub