Omobrachyiulus divaricatus (Lohmander, 1936)

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

Omobrachyiulus divaricatus (Lohmander, 1936)

Fig. 13

Chromatoiulus (Omobrachyiulus) divaricatus Lohmander, 1936: 135-140, figs 117-119.

Chromatoiulus (Omobrachyiulus) divaricatus : Lang 1959: 1791.

Chromatoiulus divaricatus : Kobakhidze 1964: 191; 1965: 394; Bababekova 1996: 90.

Megaphyllum divaricatum : Talikadze 1984: 143.

Omobrachyiulus divaricatus : Vagalinski and Lazányi 2018: 96-97, fig. 89; Kokhia and Golovatch 2018: 41; 2020: 206.

Material examined.

Armenia: 3 ♂♂, 2 ♀♀ (ZMUM), " Prov. Zori, Mount Polat ", 30.VIII.1925, A. Schelkovnikov leg. [probably H. Lohmander det.]. Georgia: 1 ♂ (SMNG), Khevsureti , ca. 200 m below Shatili, 42°39'34.8"N, 45°09'55.0"E, 1415 m a.s.l., 12-15.IX.2009, F. Walther leg. ; 1 ♂, 4 ♀♀ (SMNG), Guria, Chkhakoura, towards Bakhmaro , 41.8797°N, 42.3511°E, 1780 m a.s.l., 21.VIII.2014, F. Walther leg. ; many ♂♂, ♀♀, juv. (SMNG), Samtskhe-Javakheti, Mtsvanne Monastery , 41.8094°N, 43.3122°E, 840 m a.s.l., 24.VIII.2014, F. Walther leg. ; 4 ♂♂, 3 ♀♀, 3 juv. (SMNG), Samegrelo-Zemo Svaneti, 3 km NE of Ushguli , 42.9347°N, 43.0358°E, 19.VIII.2014, F. Walther leg. ; 1 ♂, 7 ♀♀ (SMNG), Samtskhe-Javakheti, Bakuriani, ca. 9 km to Tskhratskaro, Ugheltekhili Pass , 41.7070°N, 43.5028°E, 2210 m a.s.l., 22.VIII.2014, F. Walther leg. ; 1 ♂ (SMNG), Imereti, Sairme, towards Zekari Pass , 41.8572°N, 42.7894°E, 1920 m a.s.l., 22.VIII.2014, F. Walther leg. ; 1 ♂ (SMNG), Mtshketa-Mtianeti, Zhinvali towards Shatili , at rkm 41/65, 42.4031°N, 44.9281°E, 1090 m a.s.l., 8.VIII.2014, F. Walther leg. ; 1 ♂ (SMNG), Khashuri, Akhaldaba, Nedzvi Managed Reserve , Nedzvistskali River , 41.9082°N, 43.5151°E, humid coniferous ( Picea ) forest, VI.2011, L. Mumladze leg. ; 2 ♂, 1 ♀ (SMNG), AR Ajara, Goderdzis Ugheltekhili Pass , W slope, 41.6483°N, 42.4936°E, 1730 m a.s.l., 3.X.2012, F. Walther leg. ; 1 ♂, 2 ♀♀ (SMNG), Racha-Lechkhumi and Kvemo Svaneti, 3 km S of Mravaldzali , 41.8797°N, 42.3511°E, 1900 m a.s.l., 9.X.2011, F. Walther leg. ; many ♂♂, ♀♀, juv. (SNMG), Shida Kartli, Gagluantubani, Tana Valley, 24.1 road-km upstream Didi Ateni , 41.8508°N, 43.8658°E, 1290 m a.s.l., 16.IX.2011, F. Walther leg. ; 3 ♂♂, 8 ♀♀ (ZMUM), near Manglisi , Quercus forest, 12.XI.1984, E. Kvavadze leg. ; many ♂♂, ♀♀, juv. (ZMUM), Racha, Oni District , N of Utsera, deciduous forest near a spring, rock, in litter, 20.IX.1981 , SIG leg.; 1 ♂, 1 ♀ (ZMUM), Tsodoreti near Tbilisi, in litter, 24.XII.1974 , unknown collector; 2 ♂♂, 3 ♀♀ (ZMUM), Mukhura , ca. 14 km E of Tkibuli, 650 m, Castanea , Acer etc. forest, in litter, under logs, 18.X.1987 , SIG leg.; many ♂♂, ♀♀, juv. (ZMUM), Republic of South Ossetia - Alania, 15 km E of Kvaisi, Suram Mountain Ridge, Ertso Pass , ca. 1000 m, deciduous bush along spring, in litter and under stones, 20.X.1981 , SIG leg.; 2 ♂♂, 3 ♀♀, 2 juv. (ZMUM), 40 km W of Mestia, Kherkhvashi E of Nakra , 1250-1700 m, Quercus , Fagus , Carpinus , Picea , Abies etc. forest, litter and bark, 21.VIII-21.IX.1986 , SIG leg.; 1 ♂, 5 ♀♀ (ZMUM), Kutaisi District, 8 km E of Orpiri, environs of Cave Tsutskhvati , deciduous forest, rock, litter, 24.X.1981 , SIG leg.

Diagnosis.

A species of Omobrachyiulus very similar to O. unugulis sp. nov. by the general shape of the promere and by the opisthomere (Fig. 13 ) having a slender, rod-like, anterior process directed distad, a broad, strongly flattened, multilobed, apical outgrowth of the basoposterior process, and the similarly finely and asymmetrically bifurcate solenomere. Differs from the latter species by the following gonopodal characters: promere with a more narrowly rounded apex; apical outgrowth of opisthomeral basoposterior process nearly symmetrical, tripartite, vs. the same being asymmetrically bilobed, forming a dentate distal part and a thumb-like lateral part in O. unugulis sp. nov.; anterior process of opisthomere equal to or slightly higher than solenomere, vs. the same being significantly shorter than solenomere in O. unugulis sp. nov.; solenomere abruptly bent caudad rather than nearly straight and directed almost completely distad; and by the male hypoproct being penta- or septidentate rather than tridentate.

Descriptive notes.

Opisthomere (Fig. 13A-C ): basoposterior process weakly pronounced, ending in a nearly symmetrical tripartite apical outgrowth; anterior process very long and slender rod-like, reaching the level of, or slightly exceeding, solenomere; mesomeroidal lobe rather well-pronounced, with a rounded apex, not forming an apicolateral part; two rows of rather small spiniform filaments at mid-section of flagellum channel; solenomere, bent abruptly distad before a very fine and slender apical process directed distocaudad.

Previous records from the Caucasus.

Georgia: shore of Lake Tabatskuri; Turkey/Georgia, Ajara, "Post Arsian" [most likely a locality in the Arsiani Range shared between Turkey and Georgia] (original localities); Ipari; Rveli; Lentekhi District: Ushguli; Koruldashi; at the foot of Mt Shkhara ( Kobakhidze 1965); AR Ajara, Kintrishi Nature Reserve, mouth of Khekhpara River ( Vagalinski and Lazányi 2018); Armenia: Dilijan (original locality).

General distribution.

Caucasian endemic with a broad distribution south of the Greater Caucasus watershed; not reported north of the latter.

Figures

Figure 13. Omobrachyiulus divaricatus (Lohmander, 1936), gonopods of ♂ from near Nakra, Georgia (ZMUM) A left opisthomere, mesal view B same, oral, slightly lateral view C same, caudal, slightly mesal view. Scale bars: 0.2 mm (A), 0.1 mm (B, C). Abbreviations: ao apical outgrowth of basoposterior process, ap anterior process, fc flagellum channel, ml mesomeroidal lobe, s solenomere, sf spiniform filaments.