A review of the genus Micropachyiulus Verhoeff, 1899 and description of the related Armeniopachyiulus gen. nov. (Diplopoda: Julida: Julidae: Pachyiulini).

The European millipede genus Micropachyiulus Verhoeff, 1899 is revised based on type and non-type material, and on the available literature. The genus Hylopachyiulus Attems, 1904 is established as a junior subjective synonym of Micropachyiulus, syn. nov.

A new millipede genus and species of the tribe Pachyiulini from the Caucasus (Diplopoda, Julida, Julidae).

A new genus and species of the millipede tribe Pachyiulini, , is described from the Lesser Caucasus, Azerbaijan. Cybertypes of the new species are created from the physical holotype male and from a paratype female. The distribution and ecological features of the new species, and the position of the new genus within Pachyiulini are discussed.

The millipede genera Silvestri, 1896 and Verhoeff, 1914 in the Caucasus, with notes on their distributions (Diplopoda, Julida, Julidae).

In the Caucasus, the genera Silvestri, 1896 and Verhoeff, 1914 are shown to include two and four species, respectively: Lohmander, 1932, from Georgia and Armenia, , from Azerbaijan and Dagestan, Russia, (Lohmander, 1936), from Georgia, (Attems, 1903), from Azerbaijan and Iran, (Attems, 1927), from Azerbaijan, and , from Armenia. All these six species are described, illustrated, and keyed, and their distributions are mapped and discussed, based on the literature data and abundant new samples.