Oregoniplana geniculata

Oregoniplana geniculata is a species of planarian in the family Cercyridae. Its type-locality is China.

Etymology
The specific epithet is derived from the Latin geniculatus, "like the bent knee", in reference to the curved penis papilla of the species.

Description
Oregoniplana geniculata can vary from having an elongate body shape to an ovate-lanceolate shape. Elongated, it is 1600–2500 μm long and 290–510 μm wide. Its dorsal surface is a brownish color over a cream-colored ground, with pigment accumulating along the body's margin and around the testes and ovaries. It has two black, semilunar eyes about 67–171 μm apart. They contain 5–6 retinal cells. Its cylindrical pharynx is in the posterior half of the body, and is about 331–399 μm long and 76–92 μm wide. The mouth opening is about a fourth of the body's length from the posterior margin. In front of the pharynx are two large testes, which are about 34–122 μm wide. The penis papilla is a long, slender cone that curves in a sharp "U"-shape. The ovaries are sickle-shaped and pear-shaped, located behind the brain. They're about 77–135 μm long and 46–58 μm wide.