Hedychrum

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Taxonavigation

Ordo: Hymenoptera
Familia: Chrysididae

Name

Hedychrum Latreille, 1802 – Wikispecies link – Pensoft Profile

• Hedychrum Latreille, 1802: 317.

Note

The genus consists of robust species with a body length ranging from 4 to 10 mm. Characteristic morphological features include the meso- and metatibial pits (Figs 56–58), the enlarged metafemur (Figs 54–55), the apically bifid tarsal claw (Fig. 4) and, in some species the apicomedial tubercle on S4 of the female (Figs 59–60). Many species show sexual dimorphism, in which the mesosoma is strikingly bicoloured in the female (Fig. 47), but uniformly green, blue or violet in the male. The hosts are crabronid wasps of the subfamily Philanthinae. About 150 species are known worldwide, the majority of which occur in the Palearctic Region and Africa (Kimsey and Bohart 1991). The European fauna consists of 17 species and several subspecies, some of which probably would deserve species rank (Rosa and Soon 2012). Five species have been found in the Nordic and Baltic countries (Paukkunen et al. 2014).

Key to Hedychrum species of the Nordic and Baltic countries

Key to Hedychrum species of the Nordic and Baltic countries — J. Paukkunen , A. Berg , V. Soon , F. Ødegaard , P. Rosa

1		Male. Anterior surface of metafemur non-metallic black or brown, covered entirely by short adpressed pubescence (Fig. 54). Head and mesosoma dorsally with long and erect pubescence, setae longer than diameter of mid-ocellus    2
–		Female. Anterior surface of metafemur metallic shiny, not entirely covered by short adpressed pubescence (Fig. 55). Head and mesosoma dorsally with short inclined pubescence, setae shorter than diameter of mid-ocellus    6
2		Head and mesosoma dorsally on pronotum, mesoscutum and mesoscutellum with coppery to greenish colour, contrasting with remaining part of the mesosoma, and light brown setae    Hedychrum rutilans Dahlbom
–		Head and mesosoma completely green-bluish, with dark setae    3
3		Entire body green-blue    Hedychrum chalybaeum Dahlbom
–		Head and mesosoma green-blue, metasoma dorsally metallic red or golden    4
4		Groove on inner surface of mesotibia at least half of tibial length (Fig. 56). Mandible pale brown medially. Punctation of T3 coarse (Fig. 61)    Hedychrum gerstaeckeri Chevrier
–		Groove on inner surface of mesotibia shorter or indistinct (Figs 57, 58). Mandible usually not pale brown medially. Punctation of T3 finer (Figs 62, 63)    5
5		Groove on inner surface of mesotibia shallow and narrow, indistinctly delimited (Fig. 57). Punctation of T3 relatively sparse (Fig. 62). Digitus longer than cuspis (Fig. 64)    Hedychrum nobile (Scopoli)
–		Groove on inner surface of mesotibia deep and oval, distinctly delimited (Fig. 58). (May be indistinct in small specimens.) Punctation of T3 dense (Fig. 63). Digitus not longer than cuspis (Fig. 65)    Hedychrum niemelai Linsenmaier
6		S3 with apicomedial tubercle (Figs 59, 60)    7
–		S3 without apicomedial tubercle    9
7		Head dorsally, pronotum, mesoscutum and mesoscutellum anteriorly bright red    Hedychrum chalybaeum Dahlbom
–		Head and mesoscutellum blue-green, pronotum and mesoscutum reddish or golden    8
8		Tubercle of S3 larger, apically slightly rounded, not divided (Fig. 59). Punctation of T3 sparser. Body usually larger, 6–10 mm    Hedychrum nobile (Scopoli)
–		Tubercle of S3 smaller, apically divided in the middle (Fig. 60). Punctation of T3 denser. Body usually smaller, 5–8 mm    Hedychrum niemelai Linsenmaier
9		Head and mesosoma dorsally with coppery red colour. Head with light brown pubescence    Hedychrum rutilans Dahlbom
–		Head and mesosoma entirely blue-green or blue-violet. Head with dark brown pubescence    Hedychrum gerstaeckeri Chevrier

Taxon Treatment

• Paukkunen, J; Berg, A; Soon, V; Ødegaard, F; Rosa, P; 2015: An illustrated key to the cuckoo wasps (Hymenoptera, Chrysididae) of the Nordic and Baltic countries, with description of a new species ZooKeys, (548): 1-116. doi

Images

Figures 2–10. Tarsal claw: 2 Pseudomalus triangulifer 3 Holopyga generosa 4 Hedychrum nobile 5 Hedychridium roseum 6 Chrysis longula. Forewing: 7 Holopyga generosa 8 Hedychridium ardens 9 Pseudospinolia neglecta 10 Chrysis impressa, a and c radial sector vein, b medial vein, d medial cell.  Figure 47. Holopyga generosa ♂. Scale 1 mm. (Photo: Pekka Malinen)  Figure 53. Hedychrum niemelai ♀. Scale 1 mm.  Figures 54–65. Left hindleg, ventral view: 54 Hedychrum nobile ♂ 55 Hedychrum nobile ♀. Left mesotibia: 56 Hedychrum gerstaeckeri ♂ 57 Hedychrum nobile ♂ 58 Hedychrum niemelai ♂. S2, ventral view: 59 Hedychrum nobile ♀ 60 Hedychrum niemelai ♀. T3, dorsal view: 61 Hedychrum gerstaeckeri ♂ 62 Hedychrum nobile ♂ 63 Hedychrum niemelai ♂. Genital capsule, ventral view: 64 Hedychrum nobile ♂ 65 Hedychrum niemelai ♂, d digitus, c cuspis. Scale 0.5 mm.