FIGURE 1. Pacidesmus tiani n. sp., holotype ♂. A: anterior body portion, dorsal view; B and C: posterior body portion, dorsal and ventral views, respectively; D: head with antennae, ventral view; E: distal part of antenna. Photographed not to scale by L. Deharveng.
The small Southeast to East Asian genus Pacidesmus currently encompasses seven species, all keyed and mapped, including three new from caves in Guangxi Province, China: P. tiani n. sp., P. bedosae n. sp. and P. armatus n. sp. All six congeners from southern China have only been found in caves, all likely representing troglobites, whereas the sole epigean species is known from a high-montane forest in northern Thailand. Such a vast disjunction is certainly due to undercollecting, also meaning a far more diverse fauna of Pacidesmus to actually exist.
KEY WORDS: Diplopoda, Pacidesmus, new species, key, cave, China
FIGURE 3. Pacidesmus bedosae n. sp., paratype ♂ from Cave Dong Tu Dong. A: habitus, dorsal view; B and C: anterior body portion, ventrolateral view; D and E: posterior body portion, dorsal and ventral views, respectively. Photographed not to scale by L. Deharveng.
FIGURE 4. Pacidesmus armatus n. sp., holotype ♂. A: habitus, sublateral view; B and C: anterior body portion, dorsal and subdorsal views, respectively. D: caudal body portion, dorsal view. Photographed not to scale by L. Deharveng.
FIGURE 5. Distribution map of the known Pacidesmus species
Sergei I. Golovatch, Jean-Jacques Geoffroy and Jean-Paul Mauriès. 2010. Review of the Millipede Genus Pacidesmus Golovatch, 1991, with Descriptions of Three New Species from Caves in Southern China (Diplopoda: Polydesmida: Polydesmidae). Tropical Natural History, [former The Natural History Journal of Chulalongkorn University]. 10 (2): http://www.biology.sc.chula.ac.th/TNH/v10n2/3%20Golovatch1.pdf