Hedychridium

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Taxonavigation

Ordo: Hymenoptera
Familia: Chrysididae

Name

Hedychridium Abeille de Perrin, 1878 – Wikispecies link – Pensoft Profile

• Hedychridium Abeille de Perrin, 1878: 3.
• Euchrum Semenov, 1954: 103.

Note

This genus comprises a heterogeneous group of small colourful species ranging from 2 to 7 mm in length. Characteristic morphological features include the single perpendicular tooth of the tarsal claw and the transverse pronotal carina (Kimsey and Bohart 1991). The posterior margin of T3 is evenly rounded, without any angular projections. The biology of most species is poorly known, but according to published records, the larvae develop as nest parasites of ground-nesting crabronid wasps and solitary bees. Hedychridium is the second largest genus of Chrysididae and includes more than 300 recognised species worldwide. The highest diversity is found in arid parts of the Holarctic Region and southern Africa. A total of 86 species are known from Europe (Rosa and Soon 2012). Of these, seven occur in the Nordic and Baltic countries (Paukkunen et al. 2014). The genus is here divided into three species-groups according to Linsenmaier (1968, 1997).

Key to Hedychridium species of the Nordic and Baltic countries

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

1		Body entirely green or blue-green. Very small species, body length 2–4 mm    Hedychridium zelleri (Dahlbom)
–		Body partially red, golden red or orange. Mostly larger species    2
2		Metasoma non-metallic red or orange, sometimes with weak purple reflections    3
–		Metasoma with strong metallic shine    4
3		Head and pronotum dorsally with coppery red colour. T3 posteriorly with coarse punctures in the male    Hedychridium caputaureum Trautmann & Trautmann
–		Head and pronotum entirely blue-green or dark blue. T3 posteriorly with fine punctures in the male    Hedychridium roseum (Rossi)
4		Punctation of mesoscutum and mesoscutellum sparse, punctures separated with broad smooth interstices (Figs 69, 70). Metasoma red-purple with blue-green reflections (Figs 71, 72)    5
–		Punctation of mesoscutum and mesoscutellum denser, punctures not separated with broad smooth interstices (Figs 67, 68). Metasoma bright red or golden red with greenish reflections (Fig. 66)    6
5		S2 medially with greenish-golden metallic spot (Fig. 73). Pubescence of body relatively short. Setae on metasoma shorter than the third antennal segment (Fig. 72). Punctation of mesoscutum and mesoscutellum relatively dense (Fig. 70). Scapal basin only medially with fine horizontal ridging    Hedychridium purpurascens (Dahlbom)
–		S2 without metallic spot (occasionally with slight metallic sheen). Body with long, erect, whitish pubescence. Setae on metasoma as long as or longer than the third antennal segment (Fig. 71). Punctation of mesoscutum and mesoscutellum sparse (Fig. 69). Scapal basin covered broadly with fine cross-ridging    Hedychridium cupreum (Dahlbom)
6		Pronotum and mesoscutum dull with dense coriaceous punctation (Fig. 68). Mesoscutellum with dense punctation and distinct rugae (Fig. 68). Length of malar space less than basal width of mandible    Hedychridium coriaceum (Dahlbom)
–		Pronotum and mesoscutum shiny with sparser punctation (Fig. 67). Mesoscutellum with shiny interstices between punctures, without distinct rugae (Fig. 67). Length of malar space equal to basal width of mandible    Hedychridium ardens (Coquebert)

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 66. Hedychridium ardens ♀. Scale 1 mm.  Figures 67–74. Pronotum, mesoscutum and mesoscutellum, dorsal view: 67 Hedychridium ardens ♀, 68 Hedychridium coriaceum ♀ 69 Hedychridium cupreum ♀ 70 Hedychridium purpurascens ♀. Metasoma, dorsal view: 71 Hedychridium cupreum ♀ 72 Hedychridium purpurascens ♀. Metasoma, ventral view: 73 Hedychridium purpurascens ♀. Head, dorsal view (arrows indicating temples): 74 Hedychridium roseum ♀. Scale 1 mm.