Microedus, LeConte, 1874

Shavrin, Alexey V., 2024, Microedus LeConte, 1874 (Coleoptera: Staphylindae: Omaliinae: Anthophagini), a new genus for the Palaearctic Region, Zootaxa 5443 (2), pp. 205-223 : 210-211

Key to species of Microedus of the Palaearctic Region

1 Antennomeres 4–10 slightly elongate, but less than three times as long as broad................................... 2

- Antennomeres 4–10 markedly elongate, distinctly more than three times as long as broad............................ 4

2 Interocellar impression distinct, U-shaped; anteocellar fovea narrow. Pronotum narrow, indistinctly broader than head.Aedeagus with narrow basal portion and elongate median lobe, without internal structures ( Fig. 16 ). Body smaller: 3.00 mm. Habitus as in Fig. 2 . India............................................................................ M. brevitarsis

- Interocellar impression shallow, indistinct; anteocellar foveae very deep and moderately wide. Pronotum wide, distinctly broader than head. Aedeagus with wide basal portion, with short median lobe and distinct internal structures. Body larger.. 3

3 Punctation of pronotum indistinct, especially in median portion. Median lobe narrow; internal sac without large sclerotized structures ( Figs 18, 20–21 ). Body length: 3.15–4.60 mm. Habitus as in Fig. 4 . Russia, Kazakhstan......... M. schilenkovi

- Punctation of pronotum distinct. Median lobe moderately wide; internal sac with large sclerotized structures ( Fig. 22 ). Body length: 3.40–4.95 mm. Habitus as in Fig. 3 . Kazakhstan....................................... M. kastcheevi sp. n.

4 Pronotum moderately convex, without microsculpture. Aedeagus as in Figs. 21–26 in Shavrin & Makarov (2019). Body length: 4.30–5.10 mm. Habitus as in Fig. 6 in Shavrin & Makarov (2019). Russia, Japan....................... M. puncticollis

- Pronotum somewhat flattened, with distinct microsculpture.................................................... 5

5 Body blackish. Head and pronotum with dense and moderately large punctation. Aedeagus as in Fig. 403 in Watanabe (1990). Body length: 4.10–5.20 mm. Japan................................................................ M. pullus

- Body paler, usually reddish-brown. Head and pronotum with moderately sparse fine punctation....................... 6

6 Eyes small, with longitudinal diameter less than 1.3 times as long as postocular part. Aedeagus as in Fig. 405 in Watanabe (1990). Body length: 4.00– 4.50 mm. Japan..................................................... M. yamanakai

- Eyes larger, with longitudinal diameter more than 1.5 times as long as postocular part.............................. 7

7 Punctation of head and pronotum distinct. Parameres slightly longer than apex of median lobe ( Fig. 34 ). Body length: 3.70–4.60 mm. Habitus as in Fig. 33 . Russia, Japan.......................................................... M. subtilis

- Punctation of head and pronotum finer, indistinct. Parameres significantly longer than apex of median lobe............. 8

8 Elytra moderately narrow, slightly broadened posteriad. Median lobe short and wide, as in Fig. 410 in Watanabe (1990). Body length: 3.50–3.90 mm. Habitus as in Fig. 409 in Watanabe (1990). Japan.............................. M. flavipennis

- Elytra slightly more transverse and more strongly broadened posteriad. Median lobe elongate and moderately narrow, as in Fig. 412 in Watanabe (1990). Body length: 3.80–4.50 mm. Japan........................................... M. suzukii

Figures

FIGURES 14–17. Aedeagus of Microedus austinianus (Figs 14–15: Canada, Quebec, Riviere-a-Claude) and M. brevitarsis (Figs. 16–17: holotype): 14, 16—parameral view, 15, 17—lateral view. Scale bar: 0.1 mm.

FIGURES 1–5. Habitus of Microedus: 1—M. austinianus (USA: New Hampshire), 2—M. brevitarsis (holotype), 3—M. kastcheevi (paratype, Kazakhstan: Dzhungar Mts.), 4—A. schilenkovi (Russia: Altai, Korgon Mts.), 5—M. sp. (Kashmir). Scale bar: 1.0 mm.

FIGURES 18–23. Aedeagus of Microedus schilenkovi (Figs 18–19: Russia, Altai, Aygulakskiy Mts.; Fig. 20: Russia, Altai, Teletskoye Lake; Fig. 21: Kazakhstan, Tauchilik River) and A. kastcheevi (Figs. 22–23: paratype, Dzhungar Mts.): 18, 20–22— parameral view, 19, 23—lateral view. Scale bar: 0.1 mm.

FIGURES 6–13. Mouthparts (dorsal view) of M. austinianus (Figs. 6, 8, 10, 12) and M. schilenkovi (Figs. 7, 9, 11, 13): 6–7— labrum, 8–9—mandibles (left and right), 10–11—maxilla (right), 12–13—labium. Scale bars 0.1 mm.

FIGURES 34–42. Aedeagus (Figs. 34–36: Japan: Honshu, Mt. Hotaka) and abdominal segments (Figs. 37–42) of Microedus subtilis: 34—aedeagus, parameral view, 35—aedeagus, apex of median lobe, 36—aedeagus, lateral view, 37—male tergite VIII, 38—male sternite VIII, 39—male genital segment, 40—female tergite VIII, 41—female sternite VIII, 42—female genital segment. Scale bars 0.1 mm.

FIGURES 31–33. Lectotype labels (Fig. 31–32) and habitus (Fig. 33) of Microedus subtilis: 31–32—lectotype, with type labels, 33—Japan: Honshu: Mt. Hotaka. Scale bar: 1.0 mm.