Xystrosoma

Xystrosoma is a genus of millipede in the family Chamaesomatidae. The French zoologist Henri Ribaut first described this genus in 1927 to contain five species newly discovered in France, including the type species X. tectosagum. This genus now includes ten species.

== Distribution == Most species in this genus are found in the French Pyrenees. Three species in this genus are found in northern Spain: two species found in the autonomous community of Catalonia (X. coiffati and X. santllorence) and one species found in the Basque autonomous community (X. vasconicum). One species in this genus is found in northern Portugal (X. lusitanicum).