Xystocheir dissecta

Xystocheir dissecta is a species of flat-backed millipede in the family Xystodesmidae. It is found in North America. If threatened, X. dissecta can release a hydrogen cyanide gas, which has benzaldehyde as a byproduct. This defense works against most beetle predators, except Promecognathus.

Subspecies
These three subspecies belong to the species Xystocheir dissecta:
 * Xystocheir dissecta dissecta (Wood, 1867)
 * Xystocheir dissecta microrama Shelley, 1996
 * Xystocheir dissecta taibona Chamberlin, 1912

External resources
PBS Digital Studios | Deep Look on YouTube : This Millipede and Beetle Have a Toxic Relationship