REMYELLA MONTENEGRINA, A NEW TROGLOBITIC LEIODID BEETLE (COLEOPTERA: LEIODIDAE: LEPTODIRINI) FROM NORTHEASTERN MONTENEGRO

A new leiodid beetle species, Remyella montenegrina sp. n., from a cave in northeastern Montenegro is described and diagnosed. Both male and female genitalia and other taxonomically important characters are illustrated. The new species is clearly distinct from the closest congeners. It is of Tertiary or pre-Tertiary age and originated during the Alpine Orogeny, which affected vast areas of the Balkan Peninsula, including the Dinarides, its terra typica. The new species is both an endemic and a relict form inhabiting northeastern Montenegro.

elytral width/length ratio in males and females (0.43 and 0.44 vs. 0.41 and 0.42 vs. 0.34-0.45and 0.39-0.47 vs. 0.42 and 0.45), elytral length/height ratio in males and females (3.19 and 2.76 vs. 3.24 and 3.16 vs. 3.23-4.27and 2.86-3.90 vs. 3.17 and 2.89), maximum elytral width (slightly above the half-way point vs. level to the half-way point vs. about level to the half-way point vs. at level of the half-way point), form and setation of the apical part of male abdominal sternite IX (urite) (rounded and more setose vs. rounded and less setose vs. flattened/rounded and more setose vs. rounded and more setose), form of the median lobe (widened below apex and gradually narrowing apically in dorsal view, strongly narrowing apically in lateral view, its apex not dragged, and its lateral sides slightly concave apically vs. widened below apex and abruptly narrowing sub-apically in dorsal view, strongly narrowing apically in lateral view, its apex not dragged, and its lateral sides more concave apically vs. widened below apex/with sub-parallel sides and mostly abruptly narrowing sub-apically in dorsal view, strongly/gradually narrowing apically in lateral view, its apex sub-acute and dragged, its lateral sides mostly straight apically vs. widened below apex and abruptly narrowing sub-apically in dorsal view, strongly narrowing apically in lateral view, its apex not dragged, and its lateral sides more concave apically), length of the median lobe (reaching the level of the proximal dorsal parameral seta vs. not reaching the level of the proximal dorsal parameral seta vs. mostly reaching the level of the proximal dorsal parameral seta vs. reaching the level of the proximal dorsal parameral seta), form of the paramerae (curved medially vs. curved medially vs. mostly curved sub-apically vs. curved sub-apically), distribution of the parameral setae (ventral seta closer to proximal dorsal seta vs. all setae equidistant vs. ventral seta situated mostly at the level between two dorsal setae/closer to pre-apical dorsal seta, rarely closer to proximal dorsal seta vs. all setae equidistant), form of the inner sac (with sclerotized phanerae, its outer part carrying two weak sclerifications sub-apically vs. with well-sclerotized phanerae, its outer part carrying two weak sclerifications sub-apically vs. mostly with weakly sclerotized phanerae, its outer part rarely with two weak sclerifications sub-apically vs. with well-sclerotized phanerae, its outer part carrying two weak sclerifications sub-apically), form of the tegumen (rounded vs. relatively elongated vs. relatively elongated/rounded vs. relatively elongated), position of the outer gonostyl seta (situated at level of the first inner seta vs. situated at level of the first inner seta vs. situated at level between the first and second inner setae vs. situated at level of the first inner seta), and species distribution (Pešter Polje, northeastern Montenegro vs. Pešter Polje, southwestern Serbia vs. Pešter Polje, southwestern Serbia and northeastern Montenegro vs. Mt.Javor, southwestern Serbia) (Jeannel, 1931(Jeannel, , 1934;;Winkler, 1933;Giachino and Etonti, 1995;Ćurčić et al., 2008) (Figs. 1-4).
Pronotum sub-bell-shaped, longer than wide, barely wider in female, its width/length ratio: 0.81 in holotype male and 0.815 in paratype female.Pronotal maximum width at level of its halfway point, much narrower than elytra, covered with sparsely distributed short yellowish hairs (Fig. 1).With finely margined lateral sides, which are gradually narrowing anteriorly and sinuated posteriorly.Hind angles obtuse.Pronotal base finely margined, straight, shorter than slightly convex anterior margin.Disk regularly convex, with a sparse puncturation.Mesothoracic epimera and episterna coalesced.Mesocoxal cavities closely positioned.Mesosternal intercoxal apophysis not reaching anterior border of metasternum.Without mesosternal carina.Metasternal intercoxal apophysis wide, with separate posterior processes.
Elytra scaphoid, elongate, convex, larger in female than in male; the width/length ratio: 0.43 in male and 0.44 in female; the length/height ratio: 3.19 in male and 2.76 in female; with maximum width slightly above the half-way point (Fig. 1).Scutellum well developed.Sutural striae absent.Elytral apices not covering the pygidium in male.Disk covered with densely distributed relatively deep punctures and long recumbent yellowish hairs.
Legs very long and thin, with the femora strongly dilated basally (Fig. 1).Protibiae apically curved exteriorwards, with a setose apical border and an inner polydentate spine each.Meso-and metatibiae straight.Male protarsi pentamerous and not dilated, while female protarsi tetramerous.
Abdomen with seven visible segments in male and six in female.Male abdominal sternite IX (urite) complete, in form of a weakly sclerotized pleurotergite with a membranous area ventrally, carrying a few setae apically (Fig. 2).
Aedeagus small, weakly sclerotized, with straight median lobe in lateral view, narrowing distally, with a flattened apex curved dorsally.Median lobe wide and stout dorsally, gradually narrowing distally, somewhat impressed sub-apically, with a sub-acute apex distally (Fig. 2).Paramerae somewhat curved exteriorwards in the middle portion and narrowing distally, slightly longer than median lobe (Fig. 2).Parameral setae sub-equal.The distance between pre-apical dorsal seta and ventral seta is somewhat longer than the distance between ventral seta and proximal dorsal seta (Fig. 3).Tegumen well-sclerotized, rounded, with a hyaline rounded ventral lamina.Inner sac leaving median lobe ventrally and exceeding its length, carrying two weak sclerifications sub-apically.Endophallus in form of two sclerified phanerae and a basal phanera at the place of ductus insertion in the inner sac.
Gonostyli straight.Each stylus with an apical seta, three inner setae, and an outer seta (Fig. 4).Two inner setae close-set, while the third inner seta well distanced.Outer seta situated about the level of the first inner seta.
Bionomy and distribution -The new species was found on walls in the middle, totally dark part of the Đalovića Pećina Cave (= Pećina nad Vražjim Firovima Cave) near Bijelo Polje, Pešter Polje, northeastern Montenegro (Sirotek, 2006).The new species prefers wet cave walls and floor, where it feeds on filtrated organic matter from trickling water (Fig. 5).
The new species probably belongs to an old phyletic lineage of Tertiary or even pre-Tertiary origin.The species is both relict and endemic to northeastern Montenegro and the Pešter Polje, like other known Remyella taxa inhabiting some cave habitats in a limited area of the Dinarides in the Western Balkans (Guéorguiev, 1977;Ćurčić et al., 2008).The endemic differentiation of Remyella and the related genera on the Balkan Peninsula was facilitated by the great Alpine Orogeny, paleoclimatic events, and subsequent evolution of the underground karstic relief, which yielded numerous new epigean and hypogean niches suitable for the preservation of the old and autochthonous fauna (Ćurčić et al., 2012).

A
field trip organized by the second author (D.A.) in northeastern Montenegro (the Pešter Polje) resulted in the discovery of a new Remyella species: R. montenegrina sp.n.A description and diagnosis of the new Remyella species is given in the present study.The diagnosis of Remyella montenegrina sp.n. is based on a thorough analysis of the type series of a male and a female collected during 2012 in the Đalovića Pećina Cave (= Pećina nad Vražjim Firovima Cave) near Bijelo Polje, Pešter Polje, northeastern Montenegro.MATERIALS AND METHODS The specimens of Remyella montenegrina sp.n. were collected by hand from walls in the middle, totally dark part of the Đalovića Pećina Cave (= Pećina nad Vražjim Firovima Cave) near Bijelo Polje, Pešter Polje, northeastern Montenegro.The type specimens were analyzed in laboratories of the Institute of Zoology, University of Belgrade -Faculty of Biology, Belgrade, Serbia.These were dissected, thoroughly studied, and illustrated.Dry specimens were stuck onto paper labels.Both male and female genital structures were fixed in a medium composed of Canada balsam and xylol.All taxonomically important morphological characters were studied for comparison.A Carl Zeiss -Stemi 2000 binocular stereomicroscope and Carl Zeiss -Axioskop 40 microscope with a Canon Pow-erShot A80 digital camera attached were used.Additionally, Canon PowerShot SX 130 IS and Canon EOS 400D digital cameras were used for photographing whole specimens of the new species.RESULTS AND DISCUSSION FAMILY LEIODIDAE FLEMING, 1821 SUBFAMILY CHOLEVINAE KIRBY, 1837 TRIBE LEPTODIRINI LACORDAIRE, 1854 GENUS REMYELLA JEANNEL, 1931 REMYELLA MONTENEGRINA, SP.N. (Figs. 1-5) Etymology -After Montenegro, its terra typica.Material examined -Holotype male, from the Đalovića Pećina Cave (= Pećina nad Vražjim Firovima Cave), Đalovića Gorge, village of Đalovići near Bijelo Polje, Pešter Polje, northeastern Montenegro, 05.08.2012, leg.D. Antić; paratype female, same data as for the holotype.The type specimens are deposited in the collection of the Institute of Zoology, University of Belgrade -Faculty of Biology, Belgrade, Serbia (IZFB-13/30-31).