Review of the Afrotropical species of Deleaster Erichson, 1839 (Coleoptera, Staphylinidae, Oxytelinae) Author Cuccodoro, Giulio Muséum d’histoire naturelle, Case postale 6434, CH- 1211 Genève 6, Switzerland. giulio.cuccodoro@ville-ge.ch Author Makranczy, György Hungarian Natural History Museum, Baross utca 13, H- 1088 Budapest, Hungary. makranczy@zoo.nhmus.hu text Revue suisse de Zoologie 2013 2013-12-31 120 4 537 547 journal article 229100 10.5281/zenodo.5823328 932553c8-43a5-44db-ad85-82584347e691 0035-418X 5823328 39B4166A-2503-425D-B4D3-BDABDF42032D Deleaster gibbosus new species Figs 3, 6-7, 11, 14-20 HOLOTYPE ( ♂ ): DEMOCRATIC REPUBLIC OF CONGO ( ZAIRE ) : North Kivu , Northern face of Ruwenzori , camp de Kilindera [ 0°23'N , 29°55'E ], 2750 m , VII-VIII.1974, [leg.] R.P.M. Lejeune , à la lampe U.V. ( MRAC ). PARATYPES (7): same data as holotype, 1♂ ( MRAC ); UGANDA : Western Region , Kasese District , 8km NWW Nyakalengija , Rwenzori Mts. National Park , main trail from John Matte Hut to Nyabitaba Hut , Mubuku River , 0°21.481'N , 29°58.331'E , 2538m , 17.VIII.2008 , [leg.] V.I. Gusarov (3551), river banks near bridge 1♂ , 3ex. [DNA sample barcodes 10073492, 10073493, 10073495] ( ZMUN ), 1♀ ( MHNG ), 1♂ ( NHMW ). DESCRIPTION: Measurements (n = 5; unit = mm): HW = 1.22 (1.16-1.29); TW = 1.05 (0.99-1.09); PW = 1.17 (1.08-1.22); SW = 1.72 (1.61-1.78); AW = 1.95 (1.80- 2.10); HL = 0.82 (0.75-0.87); EL = 0.45 (0.44-0.47); TL = 0.14 (0.12-0.16); PL = 0.96 (0.91-1.00); SL = 2.14 (2.02-2.26); SC = 1.97 (1.83-2.08); FB = 4.21 (3.94-4.40); BL = 6.64 (6.20-7.11). Similar to D. pectinatus , from which it may be distinguished as follows: habitus as in Fig. 3; scape and pedicel almost concolorous with flagellum; head as in Figs 6-7; clypeus slightly trapezoid; frontoclypeal (epistomal) suture marked as a slightly impressed transversal groove; vertex with markedly curved, broad grooves (with the remnants of the ocelli in their middle) extending anterolaterally from middle of neck margin to middle of inner eyes margin, forming together a rather U-shaped impression surrounding disc, filled with dense granulose microsculpture unlike the imbricate microsculpture filling most of the groove delineating dorsal part of neck; pronotum (Figs 6-7) with hind angles rather blunt; lateral portions of posterior pronotal margin broadly arcuate; presence of two rather strongly protruding knob-like elevations near posterior pronotal angles; presence of deep, curved pronotal subbasal impression; medial pronotal groove shallow, distinct on entire length, including in subbasal impression; pronotal disc filled with conspicuous medium/fine substrigulate microsculpture, in directionality surrounding centre, latter with scattered, fine and inconspicuous punctation; elytra with posterior portion of disc conspicuously swollen; posterior portion of sutural margin markedly below level of disc; posterior elytral margin subangulate (Fig. 15); abdomen with pubescence on laterobasal parts of tergites (Fig. 14) directed only slightly outwards; pectinate middle (comb) of apical margin of abdominal tergite VIII as in Fig. 11. FIGS 4-7 SEM of head and pronotum. (4) Deleaster pectinatus Fauvel ; (5) D. negus sp. n. ; (6, 7) D. gibbosus sp. n. , N Kivu (6) and W Uganda (7). Scale bar = 0.5 mm . FIGS 8-11 (8-9) Deleaster pectinatus Fauvel , elytral apex and abdomen (8), apex of tergite VIII (9). (10) D. negus sp. n. , abdominal apex. (11) D. gibbosus sp. n. , abdominal apex. All in dorsal view, SEM in “Compo” mode. Scale bar = 0.25 mm for (9), 0.35 mm for (10), 0.40 mm for (11) and 1.00 mm for (8). FIGS 12-16 (12-13) Deleaster pectinatus Fauvel , antenna (12) and lateral part of abdomen (13), dorsal view. (14-16) D. gibbosus sp. n. lateral part of abdomen (14), elytral apex with abdomen (15) and abdominal apex (16), dorsal views. All SEM in “3D mode”. Scale bar = 0.35 mm for (16), 0.80 mm for (15), 1.00 mm for (12-14). FIGS 17-24 (17-20) Deleaster gibbosus sp. n. , male, aedeagus frontal (17) and lateral (18) views, tergites IX (19) andX (20). (21-24) D. negus sp. n. , male, aedeagusinfrontal (21) andlateral (22) views, tergitesIX (23) andX (24). Scalebar = 0.34 mmfor (17-18), 0.40 mmfor (19-24). Sexual characters: Female abdominal sternite VIII sinuate subapically, broadly rounded and very finely serrate on apical margin. Male abdominal tergite IX as in Fig. 19; tergite X as in Fig. 20; sternite VIII broadly produced on apex, with membranous edge; aedeagus as in Figs 17-18. ETYMOLOGY: The Latin name of the new species means “humped” and refers to the conspicuously swollen posterior part of the elytra. DISTRIBUTION: The species is known only from the Ruwenzori range in the Democratic Republic of Congo ( Zaire ) and Uganda . COMMENTS: Within Afrotropical Deleaster , the presence of conspicuously swollen posterior portion of elytral disc is diagnostic for D. gibbosus . The species shares with D. negus the presence on abdominal tergite VIII of a comb with a minute mesal denticle, but the two species have very distinctive aedeagi.