The largest millipede in the world is a full grown African giant black millipede (Archispirostreptus gigas) which is owned by Jim Klinger of Coppell, Texas, USA and measures 38.7 cm (15.2 in) in length, 6.7 cm (2.6 in) in circumference and has 256 legs.

The average length for this type of millipede is between 16-28 cm (6-11 in).