An annotated list of the millipede (Diplopoda) species described by Johann Carl Author Hollier, John Muséum d’histoire naturelle, C. P. 6434, CH- 1211 Genève 6, Switzerland. E-mail: john. hollier @ ville-ge. ch john.hollier@ville-ge.ch Author Stöckli, Eduard Naturhistorisches Museum Basel, Augustinergasse 2, CH- 4051 Basel, Switzerland. E-mail: eduard. stoeckli @ bs. ch eduard.stoeckli@bs.ch Author Wesener, Thomas Zoologisches Forschungsmuseum Alexander Koenig, Leibniz Institute for Animal Biodiversity, Adenauerallee 160, D- 53113 Bonn, Germany. E-mail: T. Wesener @ leibniz-zfmk. de esener@leibniz-zfmk.de Author Mesibov, Robert West Ulverstone, Tasmania, Australia 7315. E-mail: robert. mesibov @ gmail. com robert.mesibov@gmail.com Author Decker, Peter Senckenberg Museum für Naturkunde Görlitz, Department of Soil Zoology, Am Museum 1, D- 02826 Görlitz, Germany. E-mail: peter. decker @ senckenberg. de peter.decker@senckenberg.de Author Sierwald, Petra Field Museum of Natural History, 1400 S. Lake Shore Drive, Chicago, IL 60605, USA. E-mail: psierwald @ fmnh. org psierwald@fmnh.org text Revue suisse de Zoologie 2020 2020-06-04 127 1 183 240 http://dx.doi.org/10.35929/rsz.0015 journal article 10.35929/RSZ.0015 0035-418 5743454 gracilis Carl, 1913a: 219-221 , fig. 13 [ Peridontopyge ( Neodontopyge ) ]. Freetown, Sierra-Leone. One ♂ and one ♀ . The MHNG collection contains one specimen in alcohol (MHNG-ARTO-18476). The specimen has a pin running the length of the body and there are dissected parts including gonopods in a separate vial. The identification label has “ Sierra Leone W. Volz” written on it, indicating that the specimen is a syntype . The other syntype is presumably in the NMBE . Peridontopyge gracilis is the type species of the genus Neodontopyge Carl, 1913 by monotypy ( Jeekel, 1971 ). Neodontopyge gracilis Carl, 1913 , Odontopygidae gracilis Carl, 1926: 382-384 , figs 9-14 [ Pixodesmus ]. Hienghène, Juni 1911 . Unspecified number of ♂ ( ♀ not explicitly mentioned). No specimens found in the MHNG. There is one ♂ syntype (referred to as “ Typus ” in the NMB catalogue) in the NMB (inventoty number NMB-DIPL-00343a). Pixodesmus gracilis is the type species of the genus Pixodesmus Carl, 1926 by monotypy ( Jeekel, 1971 ). Pixodesmus gracilis Carl, 1912 , Pyrgodesmidae