Cratera picuia is a species of land planarian belonging to the subfamily Geoplaninae.[1] It is known from specimens found in Saint-Hilaire/Lange National Park in Brazil.
Cratera picuia is a flatworm around 30 mm in length and 3 mm in width. The body is elongated, with parallel margins and a pointed back tip. The dorsal side of the body has two pearl-orange paramedian bands separated by an ivory midline band and two oyster-white marginal bands. Each marginal band is divided in half by black-gray spots that become denser towards the back of the body, forming irregular longitudinal stripes. The ventral side of the body is a white color.[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.
The specific epithet, picuia, is derived from the Tupi language words, "inside", and, "gourd", in reference to the species' prostatic vesicle being located inside the penis bulb.