About Californiulus yosemitensis Chamberlin, 1941
Adult Californiulus yosemitensis can grow up to 11 cm (4.3 in) long and have up to 80 body segments. This species is distinguished by a broad yellow or orange dorsal band that runs from the collum, the first body segment, all the way to the telson. A distinct bold black stripe runs down the center of this colored band, and the base body color of the millipede is solid black. The simple eyes, called ocelli, are arranged in distinct patches on either side of the head; each patch contains four rows of ocelli. Californiulus yosemitensis is distributed from extreme southwestern Oregon south to Kern County, California. Its populations are found across the Warner Mountains, Cascade Range, and Sierra Nevada. It is the most widespread species in the genus Californiulus, and is common across its entire native range. In ecology, Californiulus yosemitensis is most often found under logs in relatively dry habitats, though it is occasionally encountered in moist habitats as well. In some areas of Yosemite National Park, C. yosemitensis occurs alongside Paeromopus paniculus, a larger millipede species that belongs to the family Paeromopodidae.
