Omobrachyiulus hortensis (Golovatch, 1981)

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

Omobrachyiulus hortensis (Golovatch, 1981)

Fig. 17A

Chromatoiulus hortensis Golovatch, 1981: 110-112, figs 14-26.

Megaphyllum hortense : Talikadze 1984: 143.

Omobrachyiulus hortensis : Vagalinski and Lazányi 2018: 97; Kokhia and Golovatch 2018: 41; 2020: 206.

Material examined.

Georgia: 2 ♂♂, 2 ♀♀ (ZMUM), NE of Poti, Chaladidi , Alnus , Quercus , Fraxinus forest on swamp, in litter, 13.IV.1983, SIG leg .; 1 ♂, 1 ♀ (ZMUM), AR Abkhazia, Sukhum District, Nizhnyaya Yashtukha , forest nursery, 29.III.1985, А. Markossian ; 1 ♂, 2 juv. (ZMUM), same place, tobacco plantation, 16.VI.1980 and 25.VII.1980, А. Markossian.

Diagnosis.

A species of Omobrachyiulus most similar to O. armatus sp. nov. by the promere significantly outreaching the opisthomere, the latter possessing a massive lobe-like basoposterior process forming two distinct corners, a basal and a distal one, and having a micro-spiculate mesal side, and a unipartite solenomere with a slender rod-like ending. Differs from O. armatus sp. nov. mainly by the clearly tripartite apical outgrowth of the basoposterior process, consisting of a mesal lamellar, a median fan-shaped, and a lateral spiniform part, vs. that same outgrowth being broad, unipartite, collar-shaped and dentate at the margins in the latter species.

Descriptive notes.

Promere rather slender, significantly outreaching the opisthomere, with a narrowly rounded apex; distolaterally micro-papillate. Opisthomere (Fig. 17A ) short and stout; basoposterior process massive, with a micro-spiculate mesal side, and an apical outgrowth consisting of three parts: a mesal and a median one, both being fan-like and partly fused, and a lateral spine-like one (very similar to aol in Fig. 17C ); an anterior process absent or vestigial; mesomeroidal lobe moderately developed; mesal side with a relatively large, but not freely protruding lobe (presumably gonocoxal gland), and a very large and deep anteromesal sinus; two rows of very long, erect, spiniform filaments parabasally at flagellum channel; solenomere unipartite, very fine and rod-like.

Previous records from the Caucasus.

Georgia: AR Abkhazia, Sukhum Botanical Garden (type locality).

General distribution.

COLC-SWGC.

Figures

Figure 17. A Omobrachyiulus hortensis (Golovatch, 1981), ♂ from near Poti, Georgia (ZMUM) B, C O. cf. hortensis from Mestia, Georgia (ZMUM) B right promere, caudal view A, C right opisthomere, mesal view. Scale bars: 0.1 mm. Abbreviations: aod median part of basoposterior process' apical outgrowth, aol lateral part of basoposterior process' apical outgrowth, aos mesal part of of basoposterior process' apical outgrowth, ap anterior process, bpp basoposterior process, fc flagellum channel, g (supposed) gonocoxal gland, ml mesomeroidal lobe, s solenomere, sf spiniform filaments, si anteromesal sinus.