Cratera picuia is a species of land planarian belonging to the subfamily Geoplaninae.

The body is elongated, with parallel margins and a pointed back tip.

Each marginal band is divided in half by black-gray spots that become denser towards the back of the body, forming irregular longitudinal stripes.

[2] Aside from its coloration, it is distinguished from other members of Cratera by having a canalicular prostatic vesicle located inside the penis bulb, and an ejaculatory duct that is not distally dilated.

[2] The specific epithet, picuia, is derived from the Tupi language words py, "inside", and cuia, "gourd", in reference to the species' prostatic vesicle being located inside the penis bulb.