Omalus\according to Paukkunen et al 2015

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Taxonavigation

Ordo: Hymenoptera
Familia: Chrysididae

Name

Omalus Panzer, 1801 – Wikispecies link – Pensoft Profile

• Omalus Panzer, 1801: 13.

Note

Many authors have treated this genus in the broad sense and divide it into several subgenera (see summary by Rosa 2006). We follow the classification of Kimsey and Bohart (1991), whereby Elampus, Philoctetes and Pseudomalus are recognised as valid genera. Omalus sensu stricto is characterised by the following morphological features: pronotum and mesoscutum without or with small punctures which are arranged evenly over the entire surface; mesopleuron projecting ventrally weakly, its lateroventral margin forming an obtuse angle in lateral view (Fig. 19); genal carina bisecting malar space. The larvae develop as parasitoids of crabronid wasps of the subfamily Pemphredoninae. Currently, 26 species are recognised worldwide, most of which are found in the Holarctic Region (Kimsey and Bohart 1991, Wei et al. 2014). A total of eight species are found in Europe (Rosa and Soon 2012), and three are known from the Nordic and Baltic countries (Paukkunen et al. 2014). The status of several European taxa is uncertain, and the genus is in need of taxonomic revision.

Key to Omalus species of the Nordic and Baltic countries

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

1		Mesoscutum wrinkled and dull, without punctures (Fig. 20). Apical notch of T3 deep and triangular (Fig. 21). Body bicoloured with blue, violet or black head and mesosoma, and contrastingly greenish, golden or reddish metasoma    Omalus biaccinctus (du Buysson)
–		Mesoscutum smooth and shining, without punctures or with evenly distributed punctures (Figs 22, 24). Apical notch smaller (Figs 23, 25). Body concolorous green, blue, violet or mostly black    2
2		Mesoscutum mostly with tiny punctures or impunctate (Fig. 22) and only laterally with short pubescence. If punctures coarser, then flagellomeres slightly longer than broad. Setae laterally on pronotum less than twice as long as diameter of mid-ocellus. Apical notch of T3 shallow (Fig. 23). Flagellomeres as long as or slightly longer than broad    Omalus aeneus (Fabricius)
–		Mesoscutum with relatively coarse punctures (Fig. 24) and long pubescence. Setae laterally on pronotum at least twice as long as diameter of mid-ocellus. Apical notch of T3 relatively deep (Fig. 25). Flagellomeres short, not longer than broad    Omalus puncticollis (Mocsáry)

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

Figure 18. Omalus aeneus ♀. Scale 1 mm.  Figures 19–25. Mesosoma, lateral view (arrow indicating mesopleuron): 19 Omalus aeneus ♀. Pronotum and mesoscutum, dorsal view: 20 Omalus biaccinctus ♀ 22 Omalus aeneus ♀ 24 Omalus puncticollis ♀. T3, postero-dorsal view: 21 Omalus biaccinctus ♀ 23 Omalus aeneus ♀ 25 Omalus puncticollis ♀. Scale 1 mm.