Stemmiulids are small to medium sized millipedes, reaching a maximum length of 50 mm (2 in). The body tapers gradually, and is laterally compressed, so is taller than wide. A dorsal groove is present and runs from head to tail. The eyes consist of two large
ocelli on each side of the head, and some members are capable of jumping. The living species lack
Tömösváry organs, although a fossil species from the
Miocene epoch possesses them. ==Classification==