Triomicrus, Sharp

Shen, Jia-Wei, Yin, Zi-Wei & Li, Li-Zhen, 2015, Triomicrus Sharp of Eastern China (Coleoptera: Staphylinidae: Pselaphinae), Zootaxa 4007 (4), pp. 509-528 : 528

Key to male Triomicrus in eastern China.

1 Elytral subhumeral sulci absent........................................................................... 2

- Elytral subhumeral sulci present......................................................................... 5

2 Protibiae with apical protuberance ( Fig. 8 E); Mesotibiae with apical denticle ( Fig. 8 F); Antennomere XI lacking protuberance; apical lamina of abdominal sternite VII stout, widest near middle, posterior margin obliquely narrowed ( Fig. 8 D). (Zhejiang).......................................................................... T. gutianensis Shen & Yin , sp. n.

- Protibiae and mesotibiae lacking protuberance or denticle...................................................... 3

3 Antennomere XI with large impression, as long as one-fourth of segmental length ( Fig. 5 B–C); Apical lamina of abdominal sternite VII broadest near middle and arcuate toward apex ( Fig. 5 D). (Zhejiang and Jiangxi)... T. contus Shen & Yin , sp. n.

- Antennomere XI with small impression at about one-sixth of segmental length................................... 4

4 Antennomere III wider than long, antennomere XI lacking impression near base ( Fig. 3 A), Apical lamina of abdominal sternite VII stout, widest near middle, posterior margin obliquely narrowed ( Fig. 3 D). (Anhui and Zhejiang)................................................................................................ T. anfractus Shen & Yin , sp. n.

- Antennomere III longer than wide ( Fig. 2 A), antennomere XI with impression near base ( Fig. 2 B–C); apical lamina of abdominal sternite VII slender, apex slightly curved laterally ( Fig. 2 D). (Zhejiang)................ T. aculeus Shen & Yin , sp. n.

5 Elytral subhumeral sulci short, barely reaching half of elytral length............................................. 6

- Elytral subhumeral sulci long, reaching level of metacoxae................................................... 8

6 Protibiae with projection................................................................................ 7

- Protibiae lacking apical projection; apical lamina of abdominal sternite VII narrowed near base and pointed at apex ( Fig. 7 D). (Zhejiang).................................................................. T. frondosus Shen & Yin , sp. n.

7 Protibiae with apical denticle ( Fig. 10 D); antennomere XI with impression near middle ( Fig. 10 B–C), apical lamina of abdominal sternite VII strongly transverse, pointed at apex of lateral margin ( Fig. 10 E). (Jiangxi)..... T. hamus Shen & Yin , sp. n.

- Protibiae with distinct long apical projection ( Fig. 14 D); apical lamina of abdominal sternite VII slender, narrowed at base and pointed at apex ( Fig. 14 E). (Zhejiang and Fujian)........................... T. rougemonti Löbl, Kurbatov & Nomura

8 Head with median vertexal carina....................................................................... 9

- Head lacking median vertexal carina.................................................................... 10

9 Pronotum entirely covered with dense and coarse punctation ( Fig. 1 A). (Zhejiang)....... T. abhorridus Shen & Yin , sp. n.

- Pronotum partially, finely and sparsely punctate ( Fig. 6 A), apical lamina of abdominal sternite VII short, with rounded apex ( Fig. 6 D). (Zhejiang)....................................................... T. damingensis Shen & Yin , sp. n.

10 Profemora distinctly enlarged......................................................................... 11

- Profemora normal; mesotibiae with triangular apical marginal projection ( Fig. 13 E); antennomere XI with strongly prominent protuberance ( Fig. 13 B–C); apical lamina of abdominal sternite VII transverse, strongly curved and pointed at apex ( Fig. 13 D). (Zhejiang).................................................................... T. tibialis Shen & Yin , sp. n.

11 Protrochanters with long spine ( Fig. 11 D); apical lamina of abdominal sternite VII ( Fig. 11 E). (Anhui)............................................................................................. T. inaequalis Shen & Yin , sp. n.

- Protrochanters unmodified; antennomere XI with impression near middle ( Fig. 12 B–C); apical lamina of abdominal sternite VII ( Fig. 12 D). (Anhui)......................................................... .. T. mirus Shen & Yin , sp. n.

Figures

FIGURE 1. Diagnostic characters of Triomicrus abhorridus, male. A. Habitus. B. Antennal club, in dorsal view. C. Same, in lateral view. D. Abdominal sternites VII – VIII. E. Aedeagus, in dorsal view. Scale bars: A = 0.5 mm; B, C = 0.2 mm; D, E = 0.1 mm.

FIGURE 2. Diagnostic characters of Triomicrus aculeus, male. A. Habitus. B. Antennal club, in dorsal view. C. Same, in lateral view. D. Abdominal sternites VII – VIII (population from Fengyang Shan). E. Same (population from mountain near Liyang Village). F. Aedeagus, in dorsal view (population from Fengyang Shan). G. Same (population from mountain near Liyang Village). Scale bars: A = 0.5 mm; B, C = 0.2 mm; D – G = 0.1 mm.

FIGURE 3. Diagnostic characters of Triomicrus anfractus, male. A. Habitus. B. Antennal club, in dorsal view. C. Same, in lateral view. D. Abdominal sternites VII – VIII. E. Aedeagus, in dorsal view. Scale bars: A = 0.5 mm; B, C = 0.2 mm; D, E = 0.1 mm.

FIGURE 5. Diagnostic characters of Triomicrus contus, male. A. Habitus. B. Antennal club, in dorsal view. C. Same, in lateral view. D. Abdominal sternites VII – VIII (population from Majian Town). E. Same (population from Mingyue Shan). F. Aedeagus, in dorsal view (population from Majian Town). G. Same (population from Mingyue Shan). Scale bars: A = 0.5 mm; B, C = 0.2 mm; D – G = 0.1 mm.

FIGURE 6. Diagnostic characters of Triomicrus damingensis, male. A. Habitus. B. Antennal club, in dorsal view. C. Same, in lateral view. D. Abdominal sternites VII – VIII. E. Aedeagus, in dorsal view. Scale bars: A = 0.5 mm; B, C = 0.2 mm; D, E = 0.1 mm.

FIGURE 7. Diagnostic characters of Triomicrus frondosus, male. A. Male habitus. B. Antennal club, in dorsal view. C. Same, in lateral view. D. Abdominal sternites VII – VIII (Longwang Shan). E. Same (West Tianmu Shan). F. Aedeagus, in dorsal view (Longwang Shan). G. Same (West Tianmu Shan). Scale bars: A = 0.5 mm; B, C = 0.2 mm; D – G = 0.1 mm.

FIGURE 8. Diagnostic characters of Triomicrus gutianensis, male. A. Male habitus. B. Antennal club, in dorsal view. C. Same, in lateral view. D. Abdominal sternites VII – VIII. E. Protibia in dorsal view. F. Mesotibia in dorsal view. G. Aedeagus, in dorsal view. Scale bars: A = 0.5 mm; B, C = 0.2 mm; D – G = 0.1 mm.

FIGURE 10. Diagnostic characters of Triomicrus hamus, male. A. Habitus. B. Antennal club, in dorsal view. C. Same, in lateral view. D. Protibia in dorsal view. E. Abdominal sternites VII – VIII. F. Aedeagus, in dorsal view. Scale bars: A = 0.5 mm; B, C = 0.2 mm; D – F = 0.1 mm.

FIGURE 11. Diagnostic characters of Triomicrus inaequalis, male. A. Habitus. B. Antennal club, in dorsal view. C. Same, in lateral view. D. Protrochanter. E. Abdominal sternites VII – VIII. F. Aedeagus, in dorsal view. Scale bars: A = 0.5 mm; B, C = 0.2 mm; D – F = 0.1 mm.

FIGURE 12. Diagnostic characters of Triomicrus mirus, male. A. Habitus. B. Antennal club, in dorsal view. C. Same, in lateral view. D. Abdominal sternites VII – VIII. E. Aedeagus, in dorsal view. Scale bars: A = 0.5 mm; B, C = 0.2 mm; D, E = 0.1 mm.

FIGURE 13. Diagnostic characters of Triomicrus tibialis, male. A. Habitus. B. Antennal club, in dorsal view. C. Same, in lateral view. D. Abdominal sternites VII – VIII. E. Mesotibia in dorsal view. F. Aedeagus, in dorsal view. Scale bars: A = 0.5 mm; B, C = 0.2 mm; D – F = 0.1 mm.

FIGURE 14. Diagnostic characters of Triomicrus rougemonti Löbl, Kurbatov & Nomura. A. Habitus. B. Antennal club, in dorsal view. C. Same, in lateral view. D. Protibia in dorsal view. E. Abdominal sternites VII – VIII. F. Aedeagus, in dorsal view. Scale bars: A = 0.5 mm; B, C = 0.2 mm; D – F = 0.1 mm.