An orange eyespot is present on each hindwing. An eyespot (sometimes ocellus) is an eye-like marking. The hindwings are orange with a similar eyespot. Like other euglenoids, "Euglena" possess a red eyespot, an organelle composed of carotenoid pigment granules. The hindwings are dominated by a large, blue, dark-centred and black-rimmed eyespot. Zoospores contain an eyespot and two flagella. Additionally, the forewing of a "Hipparchia semele" has one large and one small eyespot. The chloroplast contains one pyrenoid, which is encircled in a starch-shell, and one eyespot. The eyespot apparatus of "Euglena" comprises the paraflagellar body connecting the eyespot to the flagellum. The original three-membraned peridinin chloroplast is still around, converted to an eyespot. This induces neighboring cells to produce specific pigments which pattern the eyespot. Loss of N completely disrupts Dll expression, and eventually eyespot formation, in several butterfly species. The euglena's eyespot, called a "stigma", is located at its anterior end. Each eyespot can have arcs of black, blue, red, yellow, green or white. This spot is surrounded by a brilliant white ring, resembling an eyespot.