Cratera cryptolineata is a species of land planarian found in Brazil.

Cratera cryptolineata is a medium-sized land planarian with a lanceolate body, reaching about 50 millimetres (2.0 in) in length.

The color of the dorsum is homogeneously dark brown with a thin median stripe occurring along the body that is only visible under the stereomicroscope.

[1] Aside from coloration, C. cryptolineata can be distinguished from other members of Cratera by the clear halos of its eyes, a cylindrical pharynx, an almost horizontal prostatic vesicle, and a conical, symmetrical penis papilla that occupies the distal portion of the female atrium.

[1] Cratera cryptolineata is known only from the Três Barras National Forest, Santa Catarina, Brazil.