Californiulus is a genus of cylindrical millipedes containing six species native to the western United States.
Description 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 long and up to 4.7 mm wide.
Distribution 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.
SpeciesTaxon authorGeographic rangeC. blechrostriatus Shelley & Bauer, 1997Death ValleyC. chamberlini (Brolemann, 1922)Southern Oregon to Northern CaliforniaC. dorsovittatus Verhoeff, 1895Northern CaliforniaC. euphanus (Chamberlin, 1938)Western Washington to northwest OregonC. parvior (Chamberlin, 1940)Extreme northeast Oregon through the Idaho Panhandle to western MontanaC. yosemitensis Chamberlin, 1941Southeast Oregon to Kern County, California, with populations in the Warner Mountains, Cascade Range, and Sierra Nevada.
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