Dryocoetini

Faccoli, Massimo, Simonato, Mauro & Toffolo, Edoardo Petrucco, 2012, First record of Cyrtogenius Strohmeyer in Europe, with a key to the European genera of the tribe Dryocoetini (Coleoptera: Curculionidae, Scolytinae), Zootaxa 3423, pp. 27-35 : 34

Key to the European genera of the tribe Dryocoetini

This key is intended to facilitate the identification of Cyrtogenius and the other Dryocoetini genera occurring in Europe. The key is modified from Wood (1986) considering only the European genera of the Dryocoetini tribe. The arrangement of the genera in the key is not phylogenetic.

1 Anterior half of pronotum armed by asperities or granules of different sizes randomly distributed or arranged in concentric lines................................................................................................ 4

- Anterior half of pronotum unarmed by asperities or granules, with punctures on the whole surface..................... 2

2 Male mandibles with horn-like processes. Antennal funicle 4-segmented. Smaller species (<1.2 mm). Male frons deeply impressed. In shrubs of Cactus or Euphorbia ............................................... Triotemnus Wollaston

- Male mandible unadorned. Antennal funicle 5-segmented. Larger species (> 1.4 mm). Male frons either deeply impressed or flat................................................................................................. 3

3 Frons of males and females flat or convex, usually with a prominent central ridge. Lateral margin of protibiae linear and armed by 4–5 large socketed teeth. In Euphorbiaceae ............................................. Thamnurgus Eichhoff

- Male frons deeply impressed. Lateral margin of protibiae curved and armed by 5–8 small socketed teeth. In phloem of broadleaves........................................................................... Pseudothamnurgus Egger

4 Elytrae> 2x longer than pronotum. Antennal club flat, lenticular, without basal corneus portion, with procurved sutures visible on both faces of the club................................................................................ 5

- Elytrae <2x longer than pronotum length ( Fig. 1). Antennal club either obliquely truncated with a basal corneus portion and sutures visible only on the anterior face ( Fig. 2 ), or globular with straight sutures................................... 6

5 Antennal funicle 4-segmented. Antennal club with sutures obsolete or hardly visible. Lateral margin of protibiae armed by 5 small socketed teeth. Male frons convex. Scutellum rather large, flat. Mainly in phloem of Corylus or Acer .................................................................................................... Lymantor Lowendal

- Antennal funicle 5-segmented. Antennal club very strongly procurved, clearly visible on both faces. Lateral margin of protibiae armed by 7 or more small socketed teeth. Male frons impressed. Scutellum very small, not flat. Only in phloem of Clematis ...................................................................................... Xylocleptes Ferrari

6 Elytral punctures similar on striae and interstriae. In seeds of palm or Dracaena .................................... 7

- Elytral punctures larger and more deeply impressed on striae than interstriae ( Fig. 4 ). In phloem of European conifers and broadleaves.......................................................................................... 8

7 Lateral margin of protibiae armed by 2–4 large socketed teeth. Antennal funicle 5-segmented. Scutellum flat, rather large. Males smaller than females, dwarfed, different in shape. In Europe only in palm seeds.............. Coccotrypes Eichhoff

- Lateral margin of protibiae armed by 7 or more small socketed teeth. Antennal funicle 4-segmented. Scutellum very small, not flat, reduced to a narrow lamella hardly visible. Males and females similar in size. Both in palm seeds and Dracaena .......................................................................................... Dactylotrypes Eggers

8 Antennal funicle 5-segmented. Anterior margin of segment 1 in the club acutely raised and recurved or transverse. Ventrolateral margin of the declivity never elevated or specially armed.................................. .. Dryocoetes Eichhoff

- Antennal funicle 4-segmented ( Fig. 2 ). Segment 1 in the club distinctly procurved. Ventrolateral margin of the declivity slightly elevated, with small granules ( Fig. 1)............................................ Cyrtogenius Strohmeyer

Figures

FIGURE 2. Antennal funicle 4 - segmented of Cyrtogenius luteus. Note also the antennal club obliquely truncated with a basal corneous portion and sutures visible only on the anterior face.

FIGURE 4. Pronotum of Cyrtogenius luteus. Note also the elytral punctures larger and more deeply impressed along striae than interstriae.