So far, I have only found Drepanomonas revoluta in a few specimens in mosses and in bog waters. The body is laterally flattened, and on the left side, there is a distinct, slightly curved furrow (s. figs. 1 d and 3 c). Under the coverslip, the specimens often lie on their left side, so that the right side faces the coverslip, and one has to focus through the specimens to recognize the shape of the left side. The ventral margin appears almost straight, with three small apical indentations where the adoral membranelles are located. The mouth opening is a distinct depression in the middle on the ventral side (s. figs. 1 b and 2 c).

The contractile vacuole is located almost in the center of the body at the level of the mouth opening (s. fig. 1 a). From it runs a short, hard-to-see excretory canal to the ventral side (s. fig. 1 c). Just below the contractile vacuole, there is often a second vacuole where digested food residues are collected before being excreted.

The exact arrangement of the sparse ciliation is difficult to recognize without silver impregnation. Essentially, it is limited to the right side, with rows of cilia that are interrupted in the middle of the body, while the right side is almost bare.