Arcella lichenophila Decloitre, 1965
Diagnosis: Viewed from above, the test is shaped like an elongated hexagon; the pseudostome is elliptic with the major axis perpendicular to the major axis of the theca. The oral face is reinforced by three or four dark creases or folds. In lateral view the test has a low height and the largest diameter is in the middle of the height. The dorsal surface is slightly convex and the ventral face is not invaginated.
Dimensions: diameter 115-120 µm; height 90 µm; pseudostome 13X20-25 µm.
Ecology: In lichens on granite. Morocco.