''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

References