[2] The species of this genus are endemic to California where they are found in foothills of the Sierra Nevada mountains.

[3] The paranota arise high on the segments giving the millipedes a rather flat appearance.

Chamberlin based on a sample collected George Moore in Crystal-Stanislaus Cave in 1950.

[4] In 1941 Chamberlin had previously described another species that later would be moved to Sigmocheir as Paimokia maculifer based on a single female individual.

[3] In 1953 Chamberlin wrote two papers describing additional samples from Crystal Palace cave.