Sphenoderia sphaerica Playfair, 1917
Diagnosis: Test almost spherical, very slightly compressed, side-view ovate-subglobose, end broadly oval; in front-view circular, truncate anteriorly. Pseudostome a mere slit at the end of an invaginated, structureless collar. Scales distinct, oval, about five across the face, overlapping, all about the same size but irregularly disposed.
Dimensions: Length: 57-63 m, breadth 57 m, collar 21-23 m; scales 20-13 m.
Ecology: Sphagnum, Australia.