Rhicnosthetus Hoffman, 2006: 43–55 Two New Species of the Brazilian Millipede Genus Rhicnosthetus Hoffman, 2006 (Polydesmida: Chelodesmidae), Including a Key to Males Bouzan, Rodrigo Salvador Iniesta, Luiz Felipe Moretti Brescovit, Antonio Domingos Zoological Studies 2021 2021-05-25 60 21 1 14 7NFFC Pocock, 1887 Pocock 1887 [983,1323,669,694] Diplopoda Animalia Polydesmida 1 2 Arthropoda order      Rhicnosthetus Hoffman, 2006: 43–55.    Typespecies:  Rhicnosthetus rondoni Hoffman, 2006, by original designation.   Fig. 1.Live male specimen of  Rhicnosthetus chagasi sp. nov., from Fazenda São Nicolau, Cotriguaçu, Mato Grosso, Brazil. Photographed by: Dr. Domingos de Jesus Rodrigues.  Diagnosis: Males of  Rhicnosthetusdiffer from those of other chelodesmid genera by the combination of the following characters: microgranular tergal texture ( Fig. 2a–b), seminal groove running along a broad lobe on the acropodite ( Figs. 6e, 7a, c–d) (reduced in  R. penabarbosai sp. nov.; Figs. 9e, 10a, c–d), small spine in the median region of the prefemoral process ( Fig. 4a– b) (reduced in  R. chagasi sp. nov.; Figs. 6d, 7a) and a hook-shaped acropodital process ( Fig. 3a–b).  Distribution: Known from the Brazilian states of Rondôniaand Mato Grosso( Fig. 11).  Composition: Four species,  Rhicnosthetus rondoni,  R. coriaceus,  R. chagasi sp. nov.and  R. penabarbosai sp. nov.