Omobrachyiulus roseni (Verhoeff, 1921)

Vagalinski, Boyan & Golovatch, Sergei I., 2021, The millipede tribe Brachyiulini in the Caucasus (Diplopoda, Julida, Julidae), ZooKeys 1058, pp. 1-127 : 1

Omobrachyiulus roseni (Verhoeff, 1921)

Fig. 31

Brachyiulus roseni Verhoeff, 1921: 44-45, figs 8, 9.

Chromatoiulus roseni : Lohmander 1936: 148; Lang 1959: 1791.

Omobrachyiulus roseni : Vagalinski and Lazányi 2018: 100.

Material examined.

Syntype slide (gonopods, flange of male body ring 7) ( ZMB 13622 ; Verhoeff prep. 3794). Russia: Republic of Adygea : 1 ♂ (SMNG 33579), Mount Shibaba , 21.V.2004, K. Voigtländer leg. ; 4 ♂♂, 1 ♀ (SMNG 33575), at Sakhray River , 20.V.2004, K. Voigtländer leg. ; 2 ♂♂, 5 ♀♀, 7 juv. (SMNG 33576), same collecting data.

Diagnosis.

A species of Omobrachyiulus morphologically very similar to O. zuevi sp. nov. Differing from the latter species by having generally more slender and less strongly embossed gonopods, and by certain details of opisthomere structure, as follows: anterior process well-developed, linguiform, clearly visible from most aspects, vs. the same being vestigial, visible only in oral and oral-mesal views in O. zuevi sp. nov.; mesomeroidal lobe with a rather weakly developed apicolateral part, vs. the same being massive, nearly reaching the level of the solenomere in O. zuevi sp. nov.; solenomere apically only moderately enlarged, with a soft sigmoid process directed basad, vs. the same ending with a very broad, flower-like apex in O. zuevi sp. nov.

Descriptive notes.

Length 11-12 mm, height 0.8-0.9 mm. Labral setae: 16. Promentum of gnathochilarium separating both lamellae linguales almost halfway; stipites parabasally each with a row of short, stiff setae, similar to the condition seen in O. ponticus sp. nov. Tarsus of mid-body legs somewhat shorter than tibia and ca. 3 × as long as apical claw. Leg pair 1 parallel hooks; ventral lobes of ring 7 protruding entirely from metazona.

All remaining external somatic characters as in O. zuevi sp. nov.

Previous records from the Caucasus.

Russia: Republic of Adygea, 40 km NE of Mount Oshten, at an influx of Belaya River [some 20 km S of Maykop] (type locality).

General distribution.

WCIS.

Remark.

The gonopods of the presently examined near-topotypic males show no differences from those seen on the syntype slide.

Figures

Figure 31. Omobrachyiulus roseni (Verhoeff, 1921), gonopods of ♂ from Mount Shibaba, Adygea, Russia (SMNG) A right opisthomere, meso-oral view B same, oral-mesal view C distal part of the same aspect. Scale bars: 0.1 mm (A, B), 0.05 mm (C). Abbreviations: ap anterior process, ml mesomeroidal lobe, s solenomere, sp sigmoid process of solenomere.