Orsunius, Assing, 2011

Assing, V., 2011, Orsunius gen. nov. from the Oriental region (Coleoptera: Staphylinidae: Paederinae: Medonina), Linzer biologische Beiträge 43 (1), pp. 221-244 : 242-243

Key to the species of Orsunius

1 Pronotum small in relation to head ( Fig. 28 ), at most as broad as head. Punctation of head and pronotum very fine and sparse ( Figs 29, 35 ). Lateral margins of pronotum visible only in posterior half of pronotum when viewed from above. Gular sutures very narrowly separated ( Fig. 34 ). Ƌ: sternites VII-VIII as in Figs 38-39 ; aedeagus as in Figs 36-37 . N-India, Malaysia......................................................... O. immsi (BERNHAUER)

- Pronotum larger in relation to head. Punctation of head and pronotum coarser and/or denser. Lateral margins of pronotum visible in posterior two thirds of pronotum when viewed from above. Gular sutures more broadly separated. Male primary and secondary sexual characters different..................................................................................2

2 Head with dense punctation ( Figs 3 , 21 , 42 ). Ƌ: sternite VIII not distinctly oblong, except in O. securifer .........................................................................................................3

- Head with sparse and rather coarse punctation ( Figs 52 , 58 ). Ƌ: sternite VIII distinctly oblong ( Figs 54 , 66 )............................................................................................................8

3 Head and pronotum with fine punctation ( Fig. 42-43 ). Pronotum narrowly impunctate in the middle ( Fig. 43 ). Ƌ: male sternite VIII shallowly excised posteriorly ( Fig. 45 ); aedeagus with symmetric ventral process ( Figs 47-49 ). SW-India; Nepal. .......................... .......................................................................................................... O. parvexcisus nov.sp.

- Head and pronotum with distinctly coarser punctation ( Figs 3, 9 , 21-22 ). Ƌ: male sternite VIII either deeply excised or truncate posteriorly; aedeagus with distinctly asymmetric ventral process.................................................................................................4

4 Pronotum narrowly impunctate in the middle ( Fig. 22 ). Ƌ: sternite VIII with deep and broad posterior excision ( Fig. 24 ); aedeagus with ventral process not laterally compressed ( Figs 25-26 ). SE-Taiwan ...................................................... O. excisus nov.sp.

- Pronotum broadly impunctate in the middle ( Fig. 9 ). Ƌ: sternite VIII truncate posteriorly; ventral process of aedeagus laterally compressed............................................5

5 Species from China (Yunnan) and Thailand.......................................................................6

- Species from Burma...........................................................................................................7

6 Head and pronotum reddish to dark-brown; elytra dark-brown, with the anterior margins, the suture, and the posterior margins reddish, rarely uniformly reddish; abdomen reddish to reddish-brown, with the middle of tergite VII infuscate. Ƌ: sternite VIII as in Fig. 17 ; aedeagus with ventral process of characteristic shape ( Figs 18-19 ). China: Yunnan ..................................................................................... O. yunnanus nov.sp.

- Head and pronotum reddish; elytra reddish-yellow to reddish, with the anterior half often slightly and diffusely darker; abdomen reddish to dark-reddish, tergite VII not infuscate. Ƌ: sternite VIII as in Fig. 14 ; aedeagus with ventral process of different shape ( Figs 10-11 ). N-Thailand............................................................ O. wunderlei nov.sp.

7 Body broader ( Figs 70-71 ). Coloration of head and pronotum dark-reddish. Ƌ: sternite VIII not distinctly oblong ( Fig. 73 ); aedeagus with ventral process of distinctive shape ( Figs 74-76 ).................................................................................... O. discipennis (FAUVEL)

- Body more slender ( Figs 77-78 ). Coloration of head and pronotum bright reddish. Ƌ: sternite VIII distinctly oblong ( Fig. 80 ); ventral process of aedeagus conspicuously long and massive, its apex of distinctive shape ( Figs 81-83 ) ................ O. securifer nov.sp.

8 Eyes larger, approximately as long as postocular region of head in dorsal view. Protarsomeres I-IV moderately dilated. Ƌ: sternite VIII less oblong and posteriorly with pubescence ( Fig. 52 ); ventral process of characteristic shape, somewhat asymmetric in ventral view ( Figs 55-56 ). NW-Thailand........................... O. pravus nov.sp.

- Eyes smaller, distinctly shorter than postocular region in dorsal view. Protarsomeres IIV strongly dilated. Ƌ: sternite VIII more oblong and posteriorly without pubescence ( Fig. 66 ); ventral process of aedeagus of completely different shape, not distinctly asymmetric in dorsal view ( Figs 67-69 ); internal sac with distinctly sclerotized apical structures of characteristic shape. Indonesia: Bali ............................ O. prolongatus nov.sp.

Figures

Figs 27-37: Orsunius immsi (BERNHAUER) (lectotype of Medon rubicundus CAMERON): (27) habitus; (28) forebody; (29) median dorsal portion of head; (30) antenna; (31) labrum; (32) maxillary palpus; (33) ligula; (34) ventral aspect of head; (35) median dorsal portion of pronotum; (36- 37) aedeagus in lateral and in ventral view. Scale bars: 27: 1.0 mm; 28, 30: 0.5 mm; 29, 31-32, 34- 37: 0.2 mm; 33: 0.1 mm.

Figs 38-40: Orsunius immsi (BERNHAUER) (lectotype of Medon rubicundus CAMERON): (38) posterior median portion of male sternite VII; (39) male sternite VIII; (40) male abdominal segments IX-X in dorsal view. Scale bar: 0.2 mm.

Figs 1-11: Orsunius wunderlei nov.sp.: (1) habitus; (2) forebody; (3) median dorsal portion of head; (4) antenna; (5) labrum; (6) maxilla; (7) labial palpus; (8) ligula; (9) median dorsal portion of pronotum; (10) aedeagus in lateral view; (11) apical portion of aedeagus in ventral view. Scale bars: 1: 1.0 mm; 2, 4: 0.5 mm; 3, 9-11: 0.2 mm; 5-8: 0.1 mm.

Figs 20-26: Orsunius excisus nov.sp.: (20) forebody; (21) posterior median portion of head in dorsal view; (22) median dorsal portion of pronotum; (23) median portions of abdominal tergites VI and VII; (24) male sternite VIII; (25-26) aedeagus in lateral and in ventral view. Scale bars: 20: 0.5 mm; 24-26: 0.2 mm; 21-23: 0.1 mm.

Figs 41-49: Orsunius parvexcisus nov.sp.: (41) forebody; (42) median dorsal portion of head; (43) median dorsal portion of pronotum; (44) male sternite VII; (45) male sternite VIII; (46) male sternite IX; (47-48) aedeagus in lateral view; (49) ventral process of aedeagus in ventral view. Scale bars: 41: 0.5 mm; 44-45, 47-49: 0.2 mm; 42-43, 46: 0.1 mm.

Figs 50-56: Orsunius pravus nov.sp.: (50) habitus; (51) forebody; (52) anterior median portion of head in dorsal view; (53) median portion of pronotum; (54) male sternite VIII; (55-56) aedeagus in lateral and in ventral view. Scale bars: 50: 1.0 mm; 51: 0.5 mm; 52-56: 0.2 mm.

Figs 57-69: Orsunius prolongatus nov.sp.: (57) forebody; (58) median dorsal portion of head; (59) labrum (paratype); (60-61) left and right mandible; (62) maxillary palpus; (63) labium; (64) ligula; (65) median dorsal portion of pronotum; (66) male sternite VIII; (67) aedeagus in lateral view; (68) apical portion of aedeagus in ventral view; (69) apex of ventral process in lateral view. Scale bars: 57: 0.5 mm; 58, 65-68: 0.2 mm; 59-64: 0.1 mm; 69: 0.05 mm.

Figs 12-19: Orsunius wunderlei nov.sp. (12-14) and O. yunnanus nov.sp. (15-19): (12) left mandible; (13) right mandible; (14, 17) male sternite VIII; (15) habitus; (16) forebody; (18) aedeagus in lateral view; (19) apical portion of ventral process in lateral view. Scale bars: 15: 1.0 mm; 16: 0.5 mm; 12-14, 17-19: 0.2 mm.

Figs 70-76: Orsunius discipennis (FAUVEL), lectotype: (70) habitus; (71) forebody; (72) male sternite VII; (73) male sternite VIII; (74-75) aedeagus in lateral and in ventral view; (76) apex of ventral process of aedeagus in lateral view. Scale bars: 70-71: 1.0 mm; 72-75: 0.2 mm; 76: 0.1 mm.

Figs 77-83: Orsunius securifer nov.sp.: (77) habitus; (78) forebody; (79) male sternite VII; (80) male sternite VIII; (81) aedeagus in lateral view; (82) ventral process of aedeagus in ventral view; (83) apex of ventral process of aedeagus in lateral view. Scale bars: 77: 1.0 mm; 78: 0.5 mm; 79- 83: 0.2 mm.