The test, which is up to 4 mm in diameter, is in the shape of a more-or-less flattened cone with hollow center and bluntly rounded apex.
The outer wall is thick and finely perforate, umbilical side and partitions imperforate, surface smooth to papillate: aperture in the earliest chambers a simple arch, later with a single row of large openings leading into the broad open umbilicus.
Short horizontal and vertical partitions arising from the inside of the outer wall form numerous coarse alveoli that, in turn, are subdivided by second order partitions into smaller alveoli.
Fabiania was named by A. Silvestri, 1924, and is assigned to the Cymbaloporidae, Planorbulinacea, Rotaliida.
Fabiania is included in the Fabianiinae which also includes Eofabiania from the middle Eocene of California and Gunteria from the middle Eocene of the Caribbean region, and is distinct in having a world-wide distribution and a larger stratigraphic range.