Lagria (Lagria)

Ruzzier, Enrico & Martínez-Muñoz, Carlos A., 2021, First record of the invasive Lagria villosa (Fabricius, 1781) (Coleoptera Tenebrionidae: Lagriinae) in Europe, Zootaxa 4908 (1), pp. 147-150 : 148-149

Key to species of the subgenus Lagria (Lagria)

1 Antennae filiform, relatively gracile, with the antennomers not closely attached to each other. Body integument usually black or brown; elytra varying in color from light yellow to black-dark brown (species indigenous in the Palaearctic)........... 2

- Antennae moniliform, antennomeres slightly enlarged and close to each other. Body integument dark with strong purple-green metallic reflections, elytra copper-golden colored with faint metallic shine (Alien species of African origin)....................................................................................... Lagria villosa (Fabricius, 1781) *

2 Elytra oblong, slightly enlarged only in the distal part; contour of elytral disc arched in lateral view.................... 3

- Elytra stout, enlarged and almost ellipsoidal in dorsal view; contour of elytral disc almost flat in lateral view............. 5

3 Male: pronotum widest at base, strongly narrowing anteriorly; disc of the pronotum finely punctate to impunctate; relative width of horizontal eye diameter and interocular distance 1:0.3; dorsal part of eye (i.e. in dorsal view, part between deepest point of genal encroachment and inner margin of eye) slightly wider than long; temple (i.e. distance between posterior margin of eye and “neck” of the head) shorter than 0.3× longitudinal eye diameter; relative length of apicale and basale of aedeagus 1:2–2.5. Female : elytra nearly parallel-sided. Body larger: length of male 8.5–9.0, female 10–10.5 mm (Europe to Central Asia)............................................................. Lagria atripes Mulsant & Guillebeu, 1855

- Male: width of pronotum at base and at apex nearly equal, sides virtually not narrowing anteriorly, with slight lateral sinuation before base; disc of pronotum clearly punctate; relative width of horizontal eye diameter and interocular distance 1:0.4–0.7; dorsal part of eye (i.e. in dorsal view, part between deepest point of genal encroachment and inner margin of eye) as long as or slightly longer than wide; temple (i.e. distance between posterior margin of eye and “neck” of the head) about 0.5× longitudinal eye diameter; relative length of apicale and basale of aedeagus 1:4–4.5. Female: elytra widening posteriorly, widest in posterior one-third. Body smaller: length of male 7–7.5, female 8–8.5 mm ................................................ 4

4 Elytra straw yellow to light brown, with more regular punctuation, punctural interspaces not raised, surface not rugose. Male: relative width of horizontal eye diameter and interocular distance 1: 0.4–0.5; pronotum slightly longer than wide, with coarser and deeper punctures. Female: vertex (not frons!) without impression; antennomere 7 nearly 2× longer than wide; pronotum subquadrate; mid longitudinal depression of pronotum shallow, relative width of horizontal eye diameter and interocular distance 1:2 (Europe to Western Siberia and Central Asia, Morocco)......................... Lagria hirta Linnaeus, 1758

- Elytra dark brown, with more irregular punctuation, punctural interspaces partly raised, making surface rugose. Male: relative width of horizontal eye diameter and interocular distance 1: 0.6–0.7; pronotum subquadrate, with finer punctures. Female: vertex (not frons!) with shallow elongate impression; antennomere 7 as long as or barely longer than wide; pronotum slightly wider than long; mid longitudinal depression of pronotum deep, relative width of horizontal eye diameter and interocular distance 1:3 (NE Ukraine and South-eastern Russia to Russian Far East)........................ Lagria laticollis Motschulsky, 1860

5 Pronotum transverse in both sexes. Anterior margin of pronotum wider or as wide as head. Pronotum with scattered fine punctures, glossy; male with two deep impressions on pronotum. Lateral margins of pronotum always visible. 11th antennomere of male as long as four preceding antennomeres combined. Species not sexually dimorphic. Length: 9-12 mm (North-western Africa and Spain).............................................................. Lagria lata (Fabricius, 1801)

- Pronotum of male as long as wide. Anterior margin of pronotum narrower than width of head. Pronotum with deep and coarse punctures. Male without two deep impressions on pronotum. Lateral margins of pronotum not always visible. 11th antennomere of male as long as five preceding antennomeres combined. Species sexually dimorphic: males with narrower and oblong elytra compared to females. Length: 11 mm (Southern France and Iberian Peninsula)...................................................................................................... Lagria grenieri Brisout de Barneville, 1867