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.

The millipede tribe Leptoiulini in the Caucasus, with notes on its generic classification (Diplopoda: Julida: Julidae).

The generic classification of the Palaearctic tribe Leptoiulini is revised, with 11 genera being recognized. The main differences between the genera, all presented in a tabular form, lie in the structure of the 2nd and 7th leg-pairs of the male, coupled with gonopodal conformations: the presence/absence and the degree of development of flagella on the promeres, and of the phylacum and velum on the opisthomeres. Based on abundant new material, only three genera and seven species of Leptoiulini, all keyed, mapped and properly illustrated, are shown to occur in the Caucasus: Chatoleptophyllum flexum Golovatch, 1979, Kubaniulus gracilis Lohmander, 1936, K.

The millipede genus Julus Linnaeus, 1758 in the Caucasus (Diplopoda: Julida: Julidae).

The genus Julus includes seven species already described from the Caucasus region: J. alexandrae Evsyukov, 2016; J. colchicus Lohmander, 1936; J.

The millipede family Polydesmidae in the Caucasus (Diplopoda: Polydesmida).

The family Polydesmidae is represented in the Caucasus by two genera and 11 species: Polydesmus abchasius Attems, 1898, P. lignaui Lohmander, 1936, P. muralewiczi Lohmander, 1936 and P.

Colobognatha millipedes in the Caucasus (Diplopoda: Polyzoniida, Platydesmida, Siphonocryptida).

The superorder Colobognatha is represented in the Caucasus by three genera and species, one each in the orders Polyzoniida, Platydesmida and Siphonocryptida. Hirudisoma roseum (Victor, 1839) (Hirudisomatidae, Polyzoniida) is especially widespread, ranging from S Russia, Abkhazia, Georgia (with a neotype designated and described from Kakhetia, E Georgia) and NW Azerbaijan to E Turkey, and also including H. ponticum (Lohmander, 1939) (junior subjective synonym, syn.