Semionellus

Semionellus is a genus of flat-backed millipedes in the family Xystodesmidae. There are at least three described species in Semionellus.

Species
These three species belong to the genus Semionellus:
 * Semionellus michiganus (Chamberlin, 1946)
 * Semionellus placidus (Wood, 1864)
 * Semionellus tertius Chamberlin, 1948