KEY TO THE ZOOSPHAERIUM LIBIDINOSUM SPECIES- GROUP 1. Inner margin of anal shield without locking carinae (in small, immature individuals traces of carinae can be visible). Operculum of female vulva well-rounded, not notched (Fig. 10C). Tarsi slim, antenna with more than 10 sensory cones. Adults> 2 mm... Z. libidinosum — Inner margin of anal shield with 2 well-visible locking carinae (Fig. 14C). Apical margin of vulva operculum medially notched (Fig. 14D)....................................................... 2 2. Hindmost point of anal shield extended, slightly protruding posteriorly.................... 3 — Hindmost end of anal shield well-rounded................................................................. 4 3. Posterior locking carina of anal shield more than 3 times longer than anterior carina.................................................................................................................. Z. arborealis — Posterior locking carina less than 3 times longer than anterior one.......... Z. lambertoni 4. Brown-blackish coloration pattern. More than 10 sensorial cones on antenna (Fig. 1 C). Legs short, covered with long hairs (Fig. 14B). Third joint of posterior telopods without small hairs, second joint basally with one large, membranous lobe (Fig. 14K)... Z. priapus — Shiny green coloration pattern (Fig. A). Four sensorial cones on antenna. Legs elongated. Second and third joints of posterior telopods covered with numerous minute hairs. Process of second joint basally without membranous lobe (Fig. 17I, J)................ Z. anomalum

Published as part of Wesener, Thomas & Wägele, Johann-Wolfgang, 2008, The giant pill-millipedes of Madagascar: revision of the genus Zoosphaerium (Myriapoda, Diplopoda, Sphaerotheriida), pp. 5-85 in Zoosystema 30 (1) on page 22, DOI: 10.5281/zenodo.5391729