Anotylus Thomson, 1859

Wang, Lin-Fei, Zhou, Hong-Zhang & Lü, Liang, 2017, Revision of the Anotylus sculpturatus group (Coleoptera: Staphylinidae: Oxytelinae) with descriptions of seven new species from China, Zootaxa 4351 (1), pp. 1-79 : 7

Key to species groups of the genus Anotylus Thomson, 1859 from China

1. Anterior portion of the head with circular impression, pronotum with lateral portion expanded, aliform, tergites IX with ventral struts enlarged to a broad, rounded plate, almost as large as the main parts of these plates ( Fig. 2-O ) (body size 2.9–5.4 mm)....................................................................................... cimicoides group

- Without the above mentioned characteristics................................................................2

2. Pronotum lateral margins strongly crenate, without a continuous edge or border along margins, antenna IV stretched, longer than width ( Fig. 2-P ) (body size 3.6–4.8 mm).................................................... rugosus group

- Pronotum lateral margins not crenate, or partly crenate, or completely crenate, with a continuous edge or border along lateral margins.............................................................................................3

3. Male head with greatly enlarged temples, with hind angles expanded posteriorly, scutellum with elongate lateral grooves, equal in length to mid-longitudinal sulcus ( Fig. 2-R ) (body size 2.0– 5.5 mm)................................ gibbulus group

- Male head with developed temples but hind angles never expanded posteriorly, scutellum with short lateral grooves and their tips rounded.......................................................................................... 4

4. Head and pronotum with surface sculptures composed of wrinkled striae and rides, clypeus squared and limited by a complete sharp suture. Tergite X with “rhomboid fusion” ( Makranczy, 2006, 2011), i.e. basolateral parts of tergite X separated and fused to tergites IX (body size 3.0–4.0 mm)........................................................ exasperatus group

- Not like above description...............................................................................5

5. Head with post-ocular furrow absent, vertex with two longtitudinal furrows from clypeal area to occipital groove, pronotum lateral margins completely crenate, scutellum with median lobe of trilobed impression open behind ( Fig. 2-Q ) (body size 2.9– 5.4 mm).............................................................................. crassicornis group

- Not like above description...............................................................................6

6. Forebody more shinning, coriaceous, without fine longtitudinal striae............................................7

- Forebody not very much shining or dull, coarse, with fine longtitudinal striae.....................................10

7. Head without occipital furrow (body size 3.6–4.8 mm)................................................ rufus group

- Head with at least part of occipital furrow..................................................................8

8. Male clypeus depressed, anterior margin with two tubercle-like or horn-like projections, head convex, forebody sparely punc- tured, temples slightly dilated (body size 1.5–3.0 mm).............................................. micans group

- Male clypeus not depressed, or depressed but anterior margin without obvious tubercle-like or horn-like projections.......9

9. Head with complete occipital furrow, eyes large, pronotum with mid-longitudinal sulcus deep and straight, paramedial sulci short and shallow, aedeagal paramere arm-like (body size 2.4–4.0 mm).............................. nitidifrons group

- Parameres broad and contorted clockwise at apex 1/2, other characteristics not distinct, but with the following character com- bination: forebody with large and round punctuation, head as broad as pronotum (males), pronotum with paramedial sulci shal- low and broad, unobvious................................................. A. amicus Bernhauer ( amicus group)

10. Epistomal suture complete............................................................................. 11

- Epistomal suture not complete.......................................................................... 12

11. Pronotum lateral margins crenate (body size 2.0–3.0 mm)........................................... nitidulus group

- Pronotum lateral margins not crenate (body size 1.0– 2.8 mm)................................... tetracarinatus group

12. Sternite VII with anterior angles obviously produced ( Figs. 2-S ) (body size 2.5–2.7 mm)................. intricatus group

- Sternite VII with anterior angles not produced, at least not as sharp-angles....................................... 13

13. Scutellum with median lobe of trilobed impression open behind ( Figs. 2-Q ), head and pronotum with much more microsculp- ture, abdomen with thick setae, body lager (body size 2.5–4.0 mm)............................... complanatus group

- Scutellum with median lobe of trilobed impression closed behind, head and pronotum with less microsculpture, abdomen with fine setae (body size 3.5–4.7 mm)........................................................... sculpturatus group

Figures

FIGURE 2. Head and prontoum (A – N). A, amicus group (A. granadillae); B, cimicoides group (A. chinensis); C, complanatus group (A. complanatoides); D, crassicornis group (A. flavipennis [from Makranczy, 2013]); E, gibbulus group (A. megacephalus); F, tetracarinatus group (A. tetracarinatus); G, intricatus group (A. intricatus); H, micans group (A. uncifer); I, nitidulus group (A. nitidulus); J, rufus group (A. rufus); K, rugosus group (A. rugosus); L, sculpturatus group (A. cognatus); M, exasperatus group (A. fraternus); N, A. nitidifrons group (A. nitouensis); O, tergites IX with enlarged platelike ventral strut (Anotylus sp.); P. antenna segment IV; Q – R, scutellum; S, male Sternite VIII (A. intricatus). Scales: D = 0.55 mm; rest, 0.5 mm.