Giant millipedes can reach 30cm in length.
Millipedes (mil = 1,000, pedes = feet) do not have 1,000 legs but they can have over 250.
They resemble centipedes in that they have a distinct head and many repeated segments in the body. However, the details of structure are very different. The easiest way of recognising them is to look at the legs. Most segments of the body appear to have two pairs of legs. The body is also more rounded in cross section, whereas the centipedes are more flattened.
General structure of a millipede
Note that there are two pairs of legs per body segment as shown by the diagram above and the cross section and photograph below.
An illustration of a cross section of a millipede body segment.
Close up photograph of millipede body segments showing two pairs of legs per segment.