Spirostreptida is an order of long, cylindrical millipedes. There are approximately 1000 described species, making Spirostrepida the second largest order of millipedes after Polydesmida.   Spirostreptida is generally large, long and cylindrical, with 30 to 90 body rings. Eyes are present in most. This order contains the longest millipedes known: the giant African millipedes of the genus Archispirostreptus that may exceed 30 centimeters (12 in).   Spirostrepitda contains mainly tropical species, and occurs in Africa, Southern Asia to Japan, Australia, and the Western Hemisphere from the United States to Argentina.