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 medius Carl, 1902: 675-676 , pl. 12, figs 105-106 [ Sphaeriodesmus ]. Guatemala , Dr. Oltramare (Genfer Museum). Unspecified number of ♂ and ♀ . The MHNG collection contains seven specimens in alcohol in two vials. One vial (MHNG-ARTO-18239) contains a broken specimen and a smaller vial containing gonopods. The tube has a label with “ Sphaeriodesmus medius Carl 1902 , Taf. 12, Fig. 105” handwritten by Carl in pencil, and a label with “ Lectotypus ! Sig. Hoffman 79” handwritten in pencil. The other vial (MHNG- ARTO-18240) contains six specimens , four of them broken, and a label with “ Guatemala , Dr Oltramare” handwritten in pencil. The identification labels in the jar have “ Guatemala ” and “ Guatemala , Oltramare” written on them respectively. Hoffman (1999: 412) refers to a ♂ holotype in the MHNG , presumably referring to the specimen he had labelled as lectotype , but no lectotype designation has been published and all of the specimens are syntypes . Sphaeriodesmus medius Carl, 1902 , Sphaeriodesmidae