Omalus aeneus ♀︎♂︎

Last update: 3 January 2020
SPECIES: Omalus aeneus
GENUS: OMALUS
FAMILY: Cuckoo wasps (CHRYSIDIDAE)



OBSERVATION:
2019-VI-16

YEARS:
2019

MONTHS:
JanFebMarAprMayJunJulAugSepOctNovDec


Omalus aeneus ♀︎

1. DISTRIBUTION

O. aeneus [1,2] is an uncommon wasp that occurs in the middle and South of the Netherlands [3,4].

2. BEHAVIOUR

2.1. ACTIVITY

The species is active from May up into August [3].

2.2. DEVELOPMENT

O. aeneus hunts for small digger wasps of the genera Passaloecus and
Pemphredon [2,3]:

  • Passaloecus turionum
  • Passaloecu gracilis
  • Passaloecus eremita

3. IDENTIFICATION

The male and female are 3 – 7 mm [2] in length.

The characteristics of the species are [2,3]:

1. Female is entirely deep blue, violet or green
2. Male is dorsally black, with blue or green reflections on the side.

3. Base radial vein frontwing curved
4. Medial veins frontwing slightly curved, ie. has an angle larger then 90° (a strongly curved vein makes an angle of about 90°)

Omalus aeneus ♀︎, base radial vein (R) curved and medial vein (M) lightly curved

5. Head and mesosoma with short hairs (not visible in photos)
6. Temples angular when seen from above

Omalus aeneus ♀︎, angular temples

7. Fine punctuation on mesoscutum
8. Sparser and finepunctuation op pronotum (sometimes coarser)

Omalus aeneus ♀︎, Mesoscutum (Ms) and pronotum (P) with very fine punctuation

7. Metascutellum not elevated
8. Side thorax, mesopleuron, weakly projecting
9. Margins of mesopleuron tip shape an obtuse angle

Omalus aeneus ♀︎, side thorax protrudes weakly (dotted line is reference), tip sides create obtuse angle

10. Margin of abdomen without enlargement or thickening, rounded and relatively straight
11. Shallow notch on tip tergite III (not visible on photo)

12. Tergite III without teeth and pit row

Omalus aeneus ♀︎, edge tergite III smooth, without teeth and thickening

 

4. PARASITIC RELATIONS

The following hosts of O. aeneus are present in the garden:

Wasps (HYMENOPTERA)


References

1 Nederlands Soortenregister

2 SCHMID-EGGER, C. H. Bestimmungsschlüssel für die deutschen Arten der solitären Faltenwespen (Hymenoptera: Eumeninae). Deutscher Jugendbund für Naturbeobachtung, 1994, 54: 90.

3 Peeters, T.M.J., C. van Achterberg, W.R.B. Heitmans, W.F. Klein, V. Lefeber, A.J. van Loon, A.A. Mabelis, H. Nieuwen-huijsen, M. Reemer, J. de Rond, J. Smit, H.H.W. Velthuis, 2004. De wespen en mieren van Nederland (Hymenoptera: Aculeata). – Nederlandse Fauna 6. Nationaal Natuurhistorisch Museum Naturalis, Leiden, knnv Uitgeverij, Utrecht & European Invertebrate Survey – Nederland, Leiden.

4 Waarneming.nl

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