Lobrathium species

Assing, Volker, 2010, On the Lathrobiina of Taiwan (Coleoptera: Staphylinidae: Paederinae), Beiträge Zur Entomologie = Contributions to Entomology 60 (2), pp. 301-361 : 324-327

Key to the named Lobrathium species of Taiwan

The key does not not account for L. taiwanense (Taichung Hsien ), since the type material was not examined. For illustrations of the male sexual characters see WATANABE (1998) .

1. Elytra with more or less distinct reddish-yellow to reddish spot near posterior margin (sometimes weakly pronounced in L. sibynium ). ..........................................................B

- Elytra without spot near posterior margin. ...................................................................G

2. Elytra conspicuously short, at most 0.7 times as long as pronotum ( Fig. 135 ). ♂: sternite VIII with median impression with approximately 15-20 peg-setae anteriorly and without pubescence posteriorly, on either side of impression with numerous long dark setae, posterior excision large, deep, and U-shaped ( Fig. 139 ); aedeagus approximately 1.1 mm long, ventral process of distinctive shape, slender, apically curved, and with subapical tooth in ventral view ( Figs 140-141 ). ♀: tergite IX strongly emarginate anteriorly ( Fig. 144 ). Ilan and Hualien Hsien (NE- and E-Taiwan). ................................................. L. pedes sp. n .

- Elytra longer, at least 0.8 times as long as elytra. Sexual characters different. ................C

3. Slender species with long appendages. Antennae slender (Fig.A 09), approximately 2.5 mm long. Pronotum approximately 1.35 times as long as broad ( Fig. 108 ). ♂: median impression of sternite VIII with two oblong clusters of numerous peg-setae, posterior excision broadly U-shaped ( Fig. 111 ); segments IX-X remarkably long and slender ( Fig. 112 ); aedeagus 1.95 mm long, conspicuously long and slender ( Figs 113-114 ). ♀: segments IX-X conspicuously long and slender ( Fig. 117 ). Taichung Hsien : Anmashan. ......................... ........................................................................................................... L. extensum sp. n .

- Habitus less slender. Antennae at most approximately 2.0 mm long. Pronotum in most species less oblong. Sexual characters different. .............................................................D

4. ♂: sternite VIII on either side of median impression with conspicuous tuft of long black setae ( Figs 121 , 128 ). ................................................................................................... E

- ♂: sternite VIII without such tufts of long black setae. ................................................. 6

5. Small species, body length 4.8-6.0 mm. Coloration: body blackish-brown to black, elytra without bluish hue. ♂: median impression of tergite VIII large, without pubescence (except posterior portion) or peg-setae, posterior excision large, deep, and broadly V-shaped ( Fig. 121 ); aedeagus small, approximately 0.9 mm long, ventral process of very distinctive morphology, slender and furcate apically (lateral view) ( Figs 122-123 ). ♀: anterior margin of tergite IX emarginate in the middle. Ilan Hsien (NE-Taiwan). .................................... .................................................................................................. L. bipeniculatum sp. n.

- Larger species, body length 5.5-7.0 mm. Coloration darker: body blackish, elytra sometimes with weak bluish hue. ♂: median impression of sternite VIII with a cluster of numerous peg-setae, posterior excision large, deep, and U-shaped ( Fig. 128 ); aedeagus approximately 1.1 mm long, with very broad and apically bifid ventral process in ventral view ( Figs 129- 130 ). ♀: anterior margin of tergite IX not emarginate in the middle ( Fig. 133 ). Nantou Hsien (central Taiwan). ................................................................ L. penicillatum sp. n.

6. Elytra of very variable length, 0.8-1.0 times as long as pronotum. ♂: aedeagus approximately 1.3 mm long, ventral process separated into two long and slender lobes (ventral view), in lateral view with distinct tooth approximately in the middle ( Figs 102-104 ); median impression of sternite VIII narrow and with 25-40 peg-setae, posterior excision moderately large and U-shaped ( Fig. 101 ). Widespread in Taiwan. .................... L. bilobatum sp. n .

- Elytra approximately as long as pronotum. ♂: aedeagus approximately 1.1 mm long; ventral process undivided and apically acute in ventral view, without tooth in lateral view ( Figs 93-94 ); median impression of sternite VIII broad and with much more numerous peg-setae, posterior excision smaller ( Fig. 92 ). China: Sichuan; Taiwan: Chiai , Taichung, Hualien Hsien. ............................................................................... L. sibynium ZHENG

7. Elytra long, approximately as long as pronotum; hind wings fully developed ( Fig. 86 ). Body smaller, barely 6.0 mm long. Coloration of body black. Head slender, not unusually large. Pronotum slender, approximately 1.35 times as long as broad ( Fig. 86 ). ♂: sternite VII with posterior margin broadly and rather deeply concave in the middle, in posterior median area with impression, on either side of this impression with approximately seven peg-setae ( Fig. 87 ); sternite VIII oblong, along the middle with oblong impression, this impression with numerous peg-setae, posterior excision concave, its depth approximately 1/10 the length of sternite ( Fig. 88 ); aedeagus with ventral process not bilobed ( Figs 89- 90 ). Known only from the Alishan (Chiai Hsien), but probably more widespread. ......... ........................................................................................................ L. nigripennenigripenne sp. n.

- Elytra much shorter, at most approximately 0.8 times as long as pronotum; hind wings of reduced length or completely reduced. Body larger, 6.0-11.0 mm long. Coloration usually dark-brown to blackish-brown. Head large. Pronotum compact, approximately 1.2 times as long as broad. ♂: sternite VII without peg-setae (e.g., Figs 110 , 120 ); sternite VIII of different shape and chaetotaxy; aedeagus usually with distinctly bilobed ventral process (secondarily fused in L. coalitum ). ................................................................................ H

8. Elytra with fine submarginal line of variable length (lateral view). ................................ I

- Elytra without submarginal line. ................................................................................ 15

9. Elytra with moderately marked humeral angles, at least 0.7 times as long as pronotum, and usually approximately as broad as abdomen, at most only slightly narrower (e.g., Figs 164- 165 , 172-173 ). ♂: sternite VIII without peg-setae. ♀: posterior margin of tergite VIII in most species acutely produced in the middle (e.g., Fig. 170 ) (exception: L. smetanai ). .... ................................................................................................................................... 10

- Elytra with almost obsolete humeral angles, at most 0.7 times as long as pronotum, and distinctly narrower than abomen ( Figs 179-180 , 187-188 , 195-196 ). ♂: sternite VIII with peg-setae in median impression. ♀: posterior margin of tergite VIII not acutely produced in the middle. ............................................................................................................ 13

10. ♂: sternites V-VI without impressions; aedeagus as in Figs 175-176 . ♀: posterior margin of tergite VIII weakly angled in the middle ( Fig. 177 ); lateral sclerites of tergite IX anteriorly broadly separated; tergite X anteriorly very broad and reaching anterior margin of tergite IX, more convex in cross section. Kaohsiung Hsien : Peinantashan. ............ L. smetanai sp. n .

- ♂: sternites V-VI often with shallow impressions; aedeagus of different morphology. ♀: posterior margin of tergite VIII acutely produced in the middle ( Figs 152 , 161 , 170 ). .... ................................................................................................................................... 11

11. Body on average larger, 9.5-11.0 mm. Eyes relatively smaller ( Fig.A65 ). Punctation of elytra arranged in irregular series ( Fig. 165 ). ♂: aedeagus as in Figs 168-169 . Nantou Hsien. ... ................................................................................................. L. duplehamatum sp. n .

- Body length 8.0-10.0 mm. Eyes larger ( Figs 146 , 156 ). Punctation of elytra not arranged in series (e.g., Fig. 146 ). ............................................................................................. 12

12. ♂: posterior margin of tergite VIII angled in the middle ( Fig. 154 ); aedeagus with shorter and stouter apical lobes (FigsA50-151). ♀: posterior projection of tergite VIII more slender, abruptly narrowed towards apex ( Fig. 152 ); sternite VIII posteriorly distinctly produced ( Fig. 153 ). Kaohsiung Hsien : Peinantashan. ....................................... L. stimulansstimulans sp.n .

- ♂: posterior margin of tergite VIII convex; aedeagus with longer and more slender apical lobes ( Figs 159-160 ). ♀: posterior projection of tergite VIII broader, less abruptly narrowed ( Fig. 161 ); posterior margin of sternite VIII less distinctly produced in the middle ( Fig. 162 ). Kaohsiung Hsien : Kuanshan. ............................................ L. sororium sp. n .

13. Head and pronotum with coarser and less dense punctation ( Fig. 196 ). Elytra narrower, more coarsely punctate, and more glossy ( Fig. 196 ). Abdomen slender, only slightly (approximately 1.05 x) broader than elytra ( Fig. 195 ). ♂: posterior margin of tergite VIII in the middle with small, but compicuous narrow and acute process ( Fig. 198 ); sternite VIII with long and moderately narrow median impression, this impression with two long clusters of numerous peg-setae, posterior excision not very deep and broadly V-shaped ( Fig. 199 ); aedeagus of highly characteristic morphology ( Figs 200-202 ). ♀: unknown. N-Taiwan: Ilan and Taoyuan Hsien .. ............................................................. L. bisagittatum sp. n .

- Head and pronotum with much less coarse and denser punctation. Elytra broader, less coarsely punctate, and less glossy. Abdomen distinctly (approximately 1.15 x) broader than elytra. ♂: posterior margin of tergite VIII without acute process in the middle; sternite VIII of different shape and chaetotaxy; aedeagus of different morphology. ......................... 14

14. ♂: sternite VIII with distinctly more than 40 peg-setae, posterior excision deep and almost V-shaped ( Fig. 182 ); aedeagus as in Figs 183-184 . ♀: sternite VIII as in Fig. 186 . Pingtung Hsien: Peitawushan. ....................................................................... L. furcillatum sp. n .

- ♀: sternite VIII with approximately 40 peg-setae; posterior excision moderately deep and U-shaped ( Fig. 189 ); aedeagus with longer and more slender apical lobes ( Figs 190-191 ). ♀: sternite VIII as in Fig. 193 . Kaohsiung Hsien : Peinantashan. ..................................... .................................................................................................. L. cornutissimum sp. n .

15. ♂: sternite VIII without peg-setae. ............................................................................. 16

- ♂: sternite VIII with peg-setae. .................................................................................. 17

16. ♂: aedeagus with slender, acute and subapically hooked apical lobes ( Figs 231-232 ). ♀: posterior margin of tergite VIII strongly and convexly produced in the middle ( Fig. 233 ). Kaohsiung Hsien : Kuanshan. ........................................................... L. kuanicum sp. n .

- ♂: aedeagus of completely different morphology, much broader in ventral view, apical lobes apically truncate and hooked ( Figs 223-224 ). ♀: posterior margin of tergite VIII obtusely angled posteriorly ( Figs 225 ). Taichung Hsien : Hsuehshan.. ............. L. spoliatum sp. n .

17. ♂: sternite VIII posteriorly broadly impressed, this impression with subcircular to hexagonal cluster of peg-setae, posterior excision broadly concave ( Fig.B37 ); aedeagus of characteristic morphology, apical lobes fused apically (FigsB38-240). ♀: posterior margin of tergite moderately convexly produced ( Fig.B41 ); sternite VIII not oblong, posterior margin moderately produced and in the middle briefly concave ( Fig. 242 ). Nantou Hsien: Nenkaoshan. ..... ........................................................................................................... L. coalitum sp. n .

- ♂: sternite VIII of different morphology and chaetotaxy; apical lobes of aedeagus not fused apically. ♀: posterior margin of tergite VIII indistinctly to obtusely angled in the middle; sternite VIII of different shape. .................................................................................. 18

18. ♂: apical lobes of aedeagus shorter, stouter, and more narrowly separated, subapical portion of ventral process projecting laterad ( Figs 207-208 ); sternite VIII as in Fig. 206 . Chiai and Nantou Hsien: Yushan, Alishan , Kuanshan. ...................................... L. digitatum sp. n .

- ♂: apical lobes of aedeagus slightly longer, more slender, and more broadly separated, and subapical portion of ventral process not projecting laterad ( Fig. 214 ); sternite VIII as in Fig. 213 . Kaohsiung Hsien : Peinantashan. .................................... L. bidigitatum sp. n .

Figures

Figs 134-144: Lobrathium pedes sp. n.: habitus (134); forebody (135); antenna (136); male tergite VIII (137); male sternite VII (138); male sternite VIII (139); aedeagus in lateral and in ventral view (140-141); female tergite VIII (142); female sternite VIII (143); female tergites IX-X (144). Scale bars: 134-135: 1.0 mm; 136-144: 0.5 mm.

Figs 107-117: Lobrathium extensum sp. n.: habitus (107); forebody (108); antenna (109); male sternite VII (110); male sternite VIII (111); male tergites IX-X (112); aedeagus in lateral and in ventral view (113- 114); female tergite VIII (115); female sternite VIII (116); female tergites IX-X (117). Scale bars: 107-108: 1.0 mm; 109-117: 0.5 mm.

Figs 118-123: Lobrathium bipeniculatum sp. n.: forebody (118); male tergite VIII (119); male sternite VII (120); male sternite VIII (121); aedeagus in lateral and in ventral view (122-123). Scale bars: 118: 1.0 mm; 119-123: 0.5 mm.

Figs 124-133: Lobrathium penicillatum sp. n.: habitus (124); forebody (125); antenna (126); male sternite VII (127); male sternite VIII (128); aedeagus in lateral and in ventral view (129-130); female tergite VIII (131); female sternite VIII (132); female tergites IX-X (133). Scale bars: 124-125: 1.0 mm; 126-133: 0.5 mm.

Figs 97-106: Lobrathium bilobatum sp. n.: habitus (97); forebody (98); antenna (99); male tergite VIII (100); male sternite VIII (101); aedeagus in lateral and in ventral view (102-104); female tergite VIII (105); female sternite VIII (106). Scale bars: 97-99: 1.0 mm; 100-106: 0.5 mm.

Figs 86-96: Lobrathium nigripenne sp. n. (86-90) and L. sibynium ZHENG (91-96): forebody (86); male sternite VII (87, 91); male sternite VIII (88, 92); aedeagus in lateral view (89, 93), aedeagus in ventral view (90); ventral process of aedeagus in ventral view (94); female tergite VIII (95); female sternite VIII (96). Scale bars: 86: 1.0 mm; 87-96: 0.5 mm.

Figs 164-171: Lobrathium duplehamatum sp. n.: habitus (164); forebody (165); antenna (166); male sternite VIII (167); aedeagus in lateral and in ventral view (168-169); female tergite VIII (170); female sternite VIII (171). Scale bars: 164-166: 1.0 mm; 167-171: 0.5 mm.

Figs 172-177: Lobrathium smetanai sp. n.: habitus (172); forebody (173); male sternite VIII (174); aedeagus in lateral and in ventral view (175-176); female tergite VIII (177). Scale bars: 172-173: 1.0 mm; 174-177: 0.5 mm.

Figs 178-186: Lobrathium duplehamatum sp. n. (178) and L. furcillatum sp. n. (179-186): female sternite VIII (178, 186); habitus (179); forebody (180); male sternite VII (181); male sternite VIII (182); aedeagus in lateral and in ventral view (183-184); female tergite VIII (185). Scale bars: 179-180: 1.0 mm; 178, 181- 186: 0.5 mm.

Figs 187-192: Lobrathium cornutissimum sp. n.: habitus (187); forebody (188); male sternite VIII (189); aedeagus in lateral and in ventral view (190-191); female tergite VIII (192). Scale bars: 187-188: 1.0 mm; 189-192: 0.5 mm.

Figs 193-202: Lobrathium cornutissimum sp. n. (193-194) and L. bisagittatum sp. n. (195-202): female sternite VIII (193); female tergites IX-X (194); habitus (195); forebody (196); male abdominal segments VII-VIII in dorsal view (198); male sternite VIII (199); aedeagus in lateral and in ventral view (200-202). Scale bars: 195-197: 1.0 mm; 193-194, 198-202: 0.5 mm.

Figs 145-153: Lobrathium stimulans sp. n.: habitus (145); forebody (146); antenna (147); male sternite VII (148); male sternite VIII (149); aedeagus in lateral and in ventral view (150-151); female tergite VIII (152); female sternite VIII (153). Scale bars: 145-147: 1.0 mm; 148-153: 0.5 mm.

Figs 154-163: Lobrathium stimulans sp. n. (154) and L. sororium sp. n. (155-163): male tergite VIII (154); habitus (155); forebody (156); male sternite VII (157); male sternite VIII (158); aedeagus in lateral and in ventral view (159-160); female tergite VIII (161); female sternite VIII (162); apices of female tergites IX and X (163). Scale bars: 155-156: 1.0 mm; 154, 157-163: 0.5 mm.

Figs 58-66: Lathrobium nenkaoicum sp. n.: habitus (58); forebody (59); male sternite VII (60); male sternite VIII (61); aedeagus in lateral view (62); female tergite VIII (63); female tergite VIII in ventral view (64); female sternite VIII (65); female tergites IX-X (66). Scale bars: 58-59: 1.0 mm; 60-61, 63-66: 0.5 mm; 62: 0.2 mm.

Figs 228-233: Lobrathium kuanicum sp. n.: habitus (228); forebody (229); male sternite VIII (230); aedeagus in lateral and in ventral view (231-232); female tergite VIII (233). Scale bars: 228-229: 1.0 mm; 230-233: 0.5 mm.

Figs 219-227: Lobrathium spoliatum sp. n.: habitus (219); forebody (220); antenna (221); male sternite VIII (222); aedeagus in lateral and in ventral view (223-224); female tergite VIII (225); female sternite VIII (226); female tergites IX-X (227). Scale bars: 219-220: 1.0 mm; 221-227: 0.5 mm.

Figs 32-40: Lathrobium extraculum sp. n.: habitus (32); forebody (33); male sternite VII (34); male sternite VIII (35); aedeagus in lateral view (36-37); female tergite VIII (38); female sternite VIII (39); female tergites IX-X (40). Scale bars: 32-33: 1.0 mm; 34-35, 38-40: 0.5 mm; 36-37: 0.2 mm.

Figs 41-48: Lathrobium follitum sp. n.: habitus (41); forebody (42); male sternite VII (43); male sternite VIII (44); aedeagus in lateral view (45); female tergite VIII (46); female sternite VIII (47); female tergites IX-X (48). Scale bars: 41-42: 1.0 mm; 43-44, 46-48: 0.5 mm; 45: 0.2 mm.

Figs 234-243: Lobrathium kuanicum sp. n. (234) and L. coalitum sp. n. (235-243): female tergites IX-X (234, 243); habitus (235); forebody (236); male sternite VIII (237); aedeagus in lateral and in ventral view (238-239); apex of aedeagus in ventral view (240); female tergite VIII (241); female sternite VIII (242). Scale bars: 235-236: 1.0 mm; 234, 237-243: 0.5 mm.

Figs 203-210: Lobrathium digitatum sp. n.: habitus (203); forebody (204); male sternite VIII (205); aedeagus in lateral and in ventral view (207-208); female tergite VIII (209); female sternite VIII (210). Scale bars: 203-204: 1.0 mm; 205-210: 0.5 mm.

Figs 211-218: Lobrathium bidigitatum sp. n.: habitus (211); forebody (212); male sternite VIII (213); aedeagus in lateral and in ventral view (214-215); female tergite VIII (216); female sternite VIII (217); female tergites IX-X (218). Scale bars: 211-212: 1.0 mm; 213-218: 0.5 mm.