A NEW CAVE SPECIES OF THE GENUS hYleoGloMeRis VERHOEFF , 1910 , FROM THE BALKAN

A new troglobitic diplopod, Hyleoglomeris faberi n. sp., is described from a cave in western Serbia. Taxonomic relationships among European members of the genus Hyleoglomeris Verhoeff, 1910 (and some related taxa) and a number of biogeographical data are briefly discussed.


INTRODUCTION
The millipede genus Hyleoglomeris Verhoeff, 1910 is one of the largest taxa in the order Glomerida (Golovatch et al., 2006(Golovatch et al., , 2012)).This genus presently includes 74 species (Golovatch et al., 2012), with a great diversity in Asia (Mikhaljova and Lim, 2006).The western border of its area of distribution lies in Europe, in Greece, with only two described species: Hyleoglomeris epirotica (Mauriès, 1966), and H. beroni Mauriès, 1984.During a field trip in West Serbia, the third author (D. A.) collected from a cave some interesting glomerids.Careful examination showed that these individuals belong to the genus Hyleoglomeris.This paper provides a description of this species, otherwise new to science.The type material is kept in the collection of the Institute of Zoology, Faculty of Biology, University of Belgrade.Terminology used in the description of the new species follows that recently proposed for glomerids by Golovatch et al. (2006, 2012), and Wesener (2012).Head: Labrum with ten labral and four supralabral setae.Head laterally and anteriorly covered with setae.Ocelli absent (Fig. 7).Antennae with 4 large apical cones; antennomere 6 approximately 1.5 time longer than wide (in both sexes; Fig. 8).In holotype male and two paratype males, antennomerae I and II are 1.1-1.3times longer than antennomere III; in allotype female and two paratype females, antennomere III is 1.1 times longer than both antennomerae I and II.Organ of Tömösváry large, transverse-ovoid, in males 1.3-1.4times longer than wide, in female 1.5 time longer than wide (Fig. 7).Lamellae linguales with 3+3 long apical setae and basal field with numerous microsetae (Fig. 9).Stipites with 6+5 long setae.
Thoracic shield (second tergite): With a rounded hyposchism protruding beyond the hind tergal margin.Shield with 10 transverse striae of which eight entirely crossing the dorsum in greater paratype female (Fig. 11): in holotype male and paratype males, only 6-7 striae entirely crossing dorsum.
Following tergites 3-11 covered with numerous short setae, inserting in pits.Male anal shield without modification.
beroni from the Zeus Cave in Naxos Island, Greece.To date, these two species are the only known hyleoglomerids from Europe.
The distribution and structure of relevant body features includes a new species in epirotica-group of species.From both earlier described species, H. faberi differs in the absence of ocelli (both H. epirotica and H. beroni have ocelli) and the presence of a reduced 2-segmented telopodite 17 (3-segmented telopodite 17 in Greek species).In comparison with H. epirotica and H. beroni, H. faberi n. sp.differs in the number of striae on the thoracic shield (10 vs. 4-9), the presence of strongly setose telopodal syncoxal horns (present vs. absent), as well as in a considerably smaller central syncoxital lobe (small, slightly convex vs. great, subovoid or subtrapezoid).On the other hand, it shares the structure of telopod (shape of femoral and tibial processes, or setose syncoxal lobe and horns) and number of striae on the thoracic shield with some Caucasian representatives (awchasica-group).
Biogeographically, the new species is the western-most finding of representatives of the genus Hyleoglomeris.It is interesting to note that the Balkan Peninsula represents an area where the genera Hyleoglomeris and Glomeris Latreille, 1802 overlap.The finding and description of new hyleoglomerids in Europe (the Balkans), as well as similarities which the new species share with some eastern congeners, could probably lead to the actualization of Golovatch's hypothesis about the genesis, diversification and dispersion of both mentioned genera (Golovatch, 1989).