Radiolaria - Spumellaria - Xiphostylidae

Parent taxon: Xiphostylidae according to K.-Y. Yeh and Y.-N. Cheng 1998

Sister taxa: Archaeocenosphaera, Sinosphaera, Suna, Triactoma, Trigonosphaera, Tripocyclia, Xiphostylus, Zanola

Subtaxa: Amuria impensa, Amuria macfarlanei

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Type: Amuria impensa

Ecology: passively mobile planktonic omnivore