Machaerites udrzali sp. nov., a new cavernicolous species of the tribe Bythinini from Croatia, Plitvice, Rodićeva pećina is described and illustrated; the systematic position of the species is discussed.U radu se opisuje nova špiljska vrsta Machaerites udrzali sp. nov. iz skupine Bythinini iz Hrvatske (Plitvice, Rodićeva pećina); raspravlja se o položaju vrste u sistematici

J. Lakota

P. Hlaváč

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original scientific paper / izvorni znanstveni radA NEW SPECIES OF CAVERNICOLOUS GENUSMACHAERITES MILLER, 1855 (COLEOPTERA,STAPHYLINIDAE, PSELAPHINAE)FROM CROATIAPETER HLAVÁ^1 & JAN LAKOTA21Na doline 14, SK-040 14, Ko{ice, Slovakia(e-mail: hlavac@shpgroup.net)2Lesná 15, SK-034 01, Ru`omberok, Slovakia(e-mail: jan.lakota@scprbk.sk)Hlavá~, P. & Lakota, J.: A new species of cavernicolous genus Machaerites Miller, 1855 (Co-leoptera, Staphylinidae, Pselaphinae) from Croatia. Nat. Croat., Vol. 13, No. 2., 137–141, 2004,Zagreb.Machaerites udrzali sp. nov., a new cavernicolous species of the tribe Bythinini from Croatia, Plitvice,Rodi}eva pe}ina is described and illustrated; the systematic position of the species is discussed.Key words: Coleoptera, Staphylinidae, Pselaphinae, Bythinini, Machaerites udrzali sp. nov., taxo-nomy, cavernicolous, CroatiaHlavá~, P. & Lakota, J.: Nova vrsta {piljskoga roda Machaerites Miller, 1855 (Coleoptera, Stap-hylinidae, Pselaphinae) iz Hrvatske. Nat. Croat., Vol. 13, No. 2., 137–141, 2004, Zagreb.U radu se opisuje nova {piljska vrsta Machaerites udrzali sp. nov. iz skupine Bythinini iz Hrvat-ske (Plitvice, Rodi}eva pe}ina); raspravlja se o polo`aju vrste u sistematici.Klju~ne rije~i: Coleoptera, Staphylinidae, Pselaphinae, Bythinini, Machaerites udrzali sp. nov.,taksonomija, {piljski, HrvatskaINTRODUCTIONThe genus Machaerites Miller, 1855 is a strictly cavernicolous and endemic genusof Croatia, Slovenia and Italy, and is certainly one of the best studied genera of Pse-laphinae (SCHAUFUSS, 1863; JEANNEL, 1954; POGGI, 1992). Although the first species,Machaerites spelaeus Miller, was described in 1855 and the second one, Machaeritesravasinii Müller, in 1922, we had to wait for 79 years before other species were dis-covered (NONVEILLER & PAVI^EVI], 2001). During a recent biospeleological trip ma-NAT. CROAT. VOL. 13 No 2 137¿141 ZAGREB June 30, 2004Croatian Natural History Museum, Demetrova 1, Zagreb, Croatia138 Hlavá~, P. & Lakota, J.: A new species of cavernicolous genus Machaerites from CroatiaFig. 1. – habitusde by Mr. R. Udr`al to Croatia, another new species was found in Rodi}eva pe}inain Plitvice; the species is described here below. The following abbreviations areused in the text: CNHMZ – Croatian Natural History Museum, Zagreb; CPH – coll.Peter Hlavá~, Ko{ice; CJL – coll. Jan Lakota, Ru`omberok; CRU – coll. RadekUdr`al, Pardubice.Machaerites udrzali sp. nov.Etymology: Patronymic, dedicated to Mr. Radek Udr`al, the collector of the spe-cies.Material examined: Holotype male: CROATIA: Plitvice, Rodi}eva pe}ina, Ro-di}eve Ku}e, 4.9.2002, (CNHMZ); Paratypes: 9 specimens with the same data as theholotype but collected on: 16.10.2001 (2 specimens); 25.6.2002 (3 specimens);4.9.2002 (3 specimens) and 29.4. 2003 (1 specimen), (CRU, CPH, CJL).Description. Body (Fig. 1) shiny, reddish brown, sparsely pubescent, legs, anten-nae, maxillary palpi slightly lighter, length 1.61–1.73 mm, maximal width of elytraNat. Croat. Vol. 13(2), 2004 139Fig. 2. – aedeagus, dorsal aspect; Fig. 3. – aedeagus, lateral aspect0.67–0.75 mm. Head triangular, about as long as wide, with distinct wide neck; eyescompletely atrophied, vertex roundly pointed, vertexal foveae well defined, fronsbetween antennal tubercles with deep excavation, reaching vertexal foveae; maxilla-ry palpi very long, segments II–III granulate, segment IV regularly and densely pu-bescent, about as long as segment II which is pedunculate; antennae long, scapemore that 4.5 times as long as wide, expanded apically, about 3.7 times as long aspedicel, pedicel oval, segment III about 2.5 times as long as wide, segments IV–VIIIslightly elongate, IX globular and twice as large as VIII, segment X globular andtwice as large as IX, apical segment about 1.5 times as short as scape, pointed atapex.Pronotum wider than long (ratio pronotal wide/length: 1.09–1.15) and 1.3–1.4 ti-mes as wide as head, widest in apical third, lateral antebasal foveae well defined.Elytra 1.15–1.20 times as wide as long, broadly widened from base to apex,1.6–1.7 times as long (at suture) as pronotum, two basal foveae present on eachelytron, sutural stria well defined through whole length of elytra.Abdomen slightly narrower than elytra, first visible tergite longest.Legs slender and relatively long, with all tibiae simple, posterior tibiae slightlycurved in apical third.Aedeagus as in figs 2, 3, short, large, elongate, parameres meeting apically, with3 apical setae, endophallous with two equal, sclerotized corpuscles.Sexual dimorphism: None apparentDISCUSSIONMachaerites can be divided according to the structure of aedeagus and by the de-gree of modification of the posterior tibia into two well defined groups (NONVEIL-LER & PAVI^EVI], 2001). The first is characterized by having the aedeagus withparameres meeting apically and posterior tibiae modified: this includes M. spelaeusMiller and M. curvistylus Nonveiller & Pavi~evi}; the second group is characterizedby having the aedeagus with parameres separated at their apices and the posteriortibiae simple: this includes M. mekotiensis Nonveiller & Pavi~evi} and M. novissimusNonveiller & Pavi~evi}. Two species (M. ravasinii and M. udrzali) seem to be inter-mediate species as they have the aedeagus of the first group, but tibiae are simple.M. udrzali will key to couplet 13, »mekotiensis« in the key to species provided byNONVEILLER & PAVI^EVI] (2001: 332). The new species can be easily distinguishedfrom M. mekotiensis by having a scape more than 4.5 times as long as wide (only 4.5as long as wide in M. mekotiensis), a different structure of aedeagus and by its smal-ler size.140 Hlavá~, P. & Lakota, J.: A new species of cavernicolous genus Machaerites from CroatiaACKNOWLEDGEMENTSWe wish to thank Mr. Radek Udr`al, Pardubice, Czech Republic, collector of thenew species, and Jonathan Cooter, Hereford, England for reading the manuscript.Received December 5, 2003REFERENCESJEANNEL, R., 1954: Les Psélaphides troglobies de la Slovénie. Notes Biospéologiques 9, 7–15.NONVEILLER, G. & PAVI^EVI], D. R., 2001: Description d’une sous-espèce nouvelle et de six es-pèces nouvelles du genre Machaerites Miller, 1855 de Slovénie et de Croatie (Coleoptera,Pselaphinae, Bythinini). Nouvelle Revue d’Entomologie, 18(4), 317–333,SCHAUFUSS, L. W., 1863: Monographie der Gattung Machaerites Mill. Verhandlungen der Kaiser-lich-Königlichen Zoologisch-Botanischen Gesellschaft in Wien 13, 1241–1250, pl. 25.POGGI, R., 1992: Forme nuove o poco note di Pselaphidae cavernicoli del Friuli-Venezia Giuliae della Jugoslavia (Coleoptera). Memorie della Società entomologica italiana, 70 (1991) (2),207–224.Nat. Croat. Vol. 13(2), 2004 141

Nova vrsta špiljskoga roda Machaerites Miller, 1855 (Coleoptera, Staphylinidae, Pselaphinae) iz Hrvatske

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