Californiulus is a genus of cylindrical millipedes containing six species native to the western United States.
Species of Californiulus exhibit two major color patterns. Some are characterized by a broad stripe of light brown, orange or yellow extending down the dorsal surface, while others are banded in light brown against a dark gray or black base color. Adult individuals range from 5to long and up to 4.7 mm wide.[1]
The constituent species of Californiulus range from northern Washington south to Death Valley, California, and one species occurs separate from the others in a range from extreme eastern Oregon to Montana.
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| Species | Taxon author | Geographic range[2] | |
|---|---|---|---|
| C. blechrostriatus | Shelley & Bauer, 1997 | Death Valley[3] | |
| C. chamberlini | (Brolemann, 1922) | Southern Oregon to Northern California | |
| C. dorsovittatus | Verhoeff, 1895 | Northern California | |
| C. euphanus | (Chamberlin, 1938) | Western Washington to northwest Oregon | |
| C. parvior | (Chamberlin, 1940) | Extreme northeast Oregon through the Idaho Panhandle to western Montana | |
| C. yosemitensis | Chamberlin, 1941 | Southeast Oregon to Kern County, California, with populations in the Warner Mountains, Cascade Range, and Sierra Nevada. |