Zoosphaerium neptunus (Butler, 1872)

Wesener, Thomas, 2009, Unexplored richness: discovery of 31 new species of Giant Pill-Millipedes endemic to Madagascar, with a special emphasis on microendemism (Diplopoda, Sphaerotheriida), Zootaxa 2097 (1), pp. 1-134 : 15

Key to the Zoosphaerium neptunus species-group

1. Anal shield in males weakly bell-shaped. Third joint of posterior telopods slender with pointed tip. .......................... ............................................................................................................................................... Z. neptunus (Butler, 1872)

- Anal shield in males strongly bell-shaped. Third joint of posterior telopods broad with stout tip. .............................. ......................................................................................................... Z. campanulatum ( de Saussure & Zehntner, 1897)