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
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