Anthobium, Leach, 1819

Shavrin, Alexey V., 2024, Review of the genus Anthobium Leach, 1819 (Coleoptera: Staphylinidae: Omaliinae) of Western Palaearctic region, Zootaxa 5537 (4), pp. 451-474 : 470-471

Key to Western Palaearctic species of Anthobium

1 Body elongate. Pronotum relatively narrow, about one and a half as broad as long. Elytra distinctly longer than broad. Median lobe and apical portions of parameres significantly broadened ( Fig. 23 in Shavrin (2022a)). Habitus as in Fig. 1 in Shavrin (2022a). Body reddish-brown to dark brown. Body large: 4.30–5.50 mm. Middle Europe....................... algidum

- Body wide, somewhat shortened. Pronotum transverse, about twice as broad as long or slightly narrower. Median lobe and apical portions of parameres narrower. Body smaller......................................................... 2

2 Forebody less elevated, somewhat flattened. Middle potion of pronotum evenly elevated, sometimes with indistinct longitudinal impression. Aedeagus as in Fig. 62 in Shavrin (2022a). Habitus as in Fig. 2 in Shavrin (2022a). Body brown to reddish-brown. Body length: 2.70–4.50 mm. Transpalaearctic species.................................................... tectum

- Forebody distinctly elevated, convex. Middle portion strongly elevated, usually with distinct longitudinal and/or mediobasal impressions......................................................................................... 3

3 Lateral edges of pronotum with distinct crenulation, sometimes forming indistinct mediolateral angles................. 4

- Lateral edges of pronotum without crenulation.............................................................. 5

4 Pronotum about twice as broad as long, with anterior angles relatively strongly protruded anteriad, from widest middle slightly more narrowed anteriad than posteriad, with slightly concave latero-apical margin and lateral edges, sometimes forming indistinct mediolateral angles; median impressions usually indistinct. Aedeagus as in Figs. 29–30 . Habitus as in Fig. 24 . Body paler, yellow-brown to brown. Body length: 3.05–4.10 mm. South-eastern Europe, Turkey, Caucasus......... ganglbaueri

- Pronotum smaller, distinctly less transverse, with anterior angles slightly protruded anteriad, from widest middle relatively evenly narrowed both anteriad and posteriad, without concave latero-apical margin and mediolateral angles; median impressions deep. Aedeagus as in Figs. 38–43 in Shavrin & Smetana (2018). Habitus as in Fig. 1 in Shavrin & Smetana (2018). Body darker, brown to black. Body length: 2.10–3.40 mm. Palaearctic species....................................... fusculum

5 Anterior angles of pronotum strongly protruded anteriad...................................................... 6

- Anterior angles of pronotum slightly protruded anteriad...................................................... 7

6 Laterobasal margins of pronotum strongly narrowed posteriad; median pronotal impressions deep. Apical part of median lobe moderately narrow; parameres significantly longer than apex of median lobe ( Figs 10–11 ). Habitus as in Figs 4–5 . Body brown to reddish brown. Body length: 3.20–4.07 mm. Europe, Turkey, Caucasus........................... melanocephalum

- Laterobasal margins of pronotum slightly narrowed posteriad; median pronotal impressions shallow.Apical part of median lobe wide; parameres indistinctly exceeding apex of median lobe ( Figs 14, 16 ). Habitus as in Fig. 6 . Body reddish-brown. Body length: 3.55–4.10 mm. North Africa.............................................................. longicorne

7 Body yellowish or yellow-brown. Aedeagus as in Fig. 34h in Zanetti (2012). Body length: 3.00– 3.50 mm. Europe, Caucasus.............................................................................................. unicolor

- Body darker......................................................................................... 8

8 Pronotum without or with indistinct longitudinal impressions. Apical part of median lobe wide....................... 9

- Pronotum with distinct longitudinal impression. Apical part of median lobe moderately narrow...................... 10

9 Punctation of pronotum and elytra moderately fine. Parameres slightly exceeding apex of median lobe, with distinctly broadened preapical parts ( Fig. 27 ). Habitus as in Fig. 22 . Body length: 2.60–3.70 mm. Caucasus........................... tenue

- Punctation of pronotum and elytra large and deep. Parameres significantly longer than apex of median lobe, with narrow apical parts ( Fig. 25 ). Habitus as in Fig. 20 . Body length: 3.50–4.90 mm. Portugal, Spain......................... moczarskii

10 Apical angles of pronotum not or slightly protruded anteriad. Aedeagus elongate, with relatively narrow apical part of median lobe ( Figs. 7–9 and Figs 2, 4–6 in Shavrin (2020)). Habitus as in Figs 1–3 and Fig. 1 in Shavrin (2020). Body length: 2.40–3.60 mm. Palaearctic species...................................................................... atrocephalum

- Apical angles of pronotum distinctly protruded anteriad. Aedeagus short, with slightly broadened apical part of median lobe ( Fig. 17 ). Habitus as in Fig. 21 . Body length: 3.20–4.15 mm. Syria, Lebanon, Turkey....................... metallicum

Figures

FIGURES 19–23. Habitus of Lathrimaeum (types) and Anthobium: 19–L. moczarskii (holotype), 20–L. metallicum (holotype), 21–L. tenue (lectotype), 22–L. laterale (holotype), 23–A. ganglbaueri (Turkey, Ulu Dað). Scale bar: 1.0 mm.

FIGURES 1–6. Habitus of Lathrimaeum (types) and Anthobium: 1–L. gracilicorne (holotype), 2–L. abantense (holotype), 3–L. urgelense (holotype), 4–L. hamatum (holotype), 5–A. melanocephalum (Georgia: Svaneti), 6–L. longicorne (lectotype). Scale bar: 1.0 mm.

FIGURES 24–30. Aedeagus of Anthobium (Figs 24–25: A. moczarskii (Spain, Pinilla del Valle), Figs 26–27: A. tenue (Georgia, Surami Pass), Fig. 28: A. ganglbaueri (Turkey, Bademli), Figs 29–30: A. ganglbaueri (Turkey, Kastamonu): 24, 26, 28–29– parameral view, 25, 27, 30–lateral view. Scale bar: 0.1 mm.

FIGURES 7–12. Aedeagus of Lathrimaeum (types) and Anthobium (Fig. 7: L. gracilicorne (holotype), Fig. 8: L. abantense (holotype), Fig. 9: A. atrocephalum (Algeria, Adekar), Figs 10–12: A. melanocephalum (Fig. 10: Georgia, Kherkhvashi, Figs 11–12: Karachay-Cherkessia, Malaya Khatipara Mt.): 7–11–parameral view, 12–lateral view. Scale bar: 0.1 mm.

FIGURES 13–17. Aedeagus of Anthobium (Figs 13–14: A. longicorne (Algeria, Tikjida), Fig. 15: L. longicorne (Algeria, Babor Mt.), Figs 16–17: A. metallicum (Turkey, Isparta): 13, 15–16–parameral view, 14, 17–lateral view. Scale bar: 0.1 mm.