The very small shell is depressed. The teleoconch is sculptured by acute spiral keels. The base is ribbed. A wide umbilicus is present. The protoconch is barrel-shaped, sculptured with very fine spiral lines.
Differences: Fossarella differs from Vanikoro, Megalompalus, Macromphalus, Micromphalina and Constantia by the sculpture of the teleoconch only exhibiting a spiral element. It differs from the convergent genus Fossarus (Planaxidae) by the protoconch with very fine spiral lines lacking any axial sculpture.