Triomicrus

Shen, Jia-Wei, Yin, Zi-Wei & Li, Li-Zhen, 2015, Six new species of Triomicrus Sharp from southern China (Coleoptera: Staphylinidae: Pselaphinae), Zootaxa 4044 (4), pp. 585-595 : 594

Key to southern Chinese Triomicrus based on males

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

- Elytral subhumeral sulci present......................................................................... 6

2 Mesotibia with spur.................................................................................... 3

- Mesotibia lacking spur................................................................................. 5

3 Protibia lacking protuberance............................................................................ 4

- Protibia with small apical protuberance ( Fig. 7 E); mesotibia with curved apical protuberance ( Fig. 7 D); apical lamina of abdominal sternite VII transverse, pointed at apex of lateral margin ( Fig. 7 F, 7G). (Southern China: Guangxi).............................................................................. T. cf. punctifrons Löbl, Kurbatov & Nomura

4 Mesotibia with long acute apical spur ( Fig. 1 E); pronotum entirely, densely and coarsely punctate ( Fig. 1 A); apical lamina of abdominal sternite VII transverse, rounded at apex of lateral margin ( Fig. 1 D). (Southern China: Guangdong).......................................................................................... T. acutus Shen and Yin , sp. n.

- Mesotibia with large triangular apical spur ( Fig. 3 D); pronotum entirely, densely and coarsely punctate ( Fig. 3 A); apical lamina of abdominal sternite VII narrowed near base, widest at apex ( Fig. 3 E, 3F). (Southern China: Guangdong, southern Hunan and Guangxi)................................................................ T. cochlis Shen and Yin , sp. n.

5 Head with median vertexal carina ( Fig. 2 A); pronotum partially, finely and sparsely punctate ( Fig. 2 A); apical lamina of abdominal sternite VII narrowed near base, widest near middle, posterior margin obliquely narrowed ( Fig. 2 D). (Southern China: Guangxi)................................................................ T. cavus Shen and Yin , sp. n.

- Head lacking median vertexal carina ( Fig. 6 A); pronotum entirely, densely and coarsely punctate ( Fig. 6 A); apical lamina of abdominal sternite VII widest near base, posterior margin obliquely narrowed, pointed at apex ( Fig. 6 D). (Southern China: Guangdong and southern Hunan)................................................ T. pinnatus Shen and Yin , sp. n.

6 Head with median vertexal carina ( Fig. 5 A); pronotum partially and finely punctate ( Fig. 5 A); apical lamina of abdominal sternite VII composed of two sclerites, left one narrowed near base, rounded at apex of lateral margin, right one relatively small ( Fig. 5 D). (Southern China: Guangdong)....................................... T. nanlingensis Shen and Yin , sp. n.

- Head lacking median vertexal carina ( Fig. 4 A); pronotum smooth ( Fig. 4 A); profemora swollen ( Fig. 4 A); apical lamina of abdominal sternite VII composed of two sclerites, each curved mesally ( Fig. 4 D). (Southern China: Guangxi).......................................................................................... T. longus Shen and Yin , sp. n.

Figures

FIGURE 1. Diagnostic characters of Triomicrus acutus, male. A. Habitus. B. Antennal club, in dorsal view. C. Same, in lateral view. D. Mesotibia 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 2. Diagnostic characters of Triomicrus cavus, 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 3. Diagnostic characters of Triomicrus cochlis, male. A. Habitus. B. Antennal club, in dorsal view. C. Same, in lateral view. D. Mesotibia in dorsal view. E. Abdominal sternites VII – VIII (population from Mao'er Shan). F. Same (population from Nanling). G. Aedeagus, in dorsal view (population from Mao'er Shan). H. Same (population from Nanling). Scale bars: A = 0.5 mm; B, C = 0.2 mm; D – H = 0.1 mm.

FIGURE 4. Diagnostic characters of Triomicrus longus, 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 nanlingensis, 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 6. Diagnostic characters of Triomicrus pinnatus, 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 cf. punctifrons, male. A. Male habitus. B. Antennal club, in dorsal view. C. Same, in lateral view. D. Protibia in dorsal view. E. Mesotibia in dorsal view. F. Abdominal sternites VII – VIII (population from Mao'er Shan). G. Same (population from Daming Shan). H. Aedeagus, in dorsal view (population from Mao'er Shan). I. Same (population from Daming Shan). Scale bars: A = 0.5 mm; B, C = 0.2 mm; D – I = 0.1 mm.