Omalus iridescens
Omalus iridescens is a of cuckoo wasp in the Chrysididae. Like other members of the Omalus, it is a that exploits the nesting of solitary . The species exhibits the characteristic metallic coloration typical of chrysidid wasps. Based on documented behaviors of closely related Omalus species, females likely oviposit into aphids that are subsequently captured by crabronid wasps and transported to their nests, where the cuckoo wasp larva develops at the expense of the 's offspring.
Pronunciation
How to pronounce Omalus iridescens: /oˈma.lus i.riˈde.skens/
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Host Associations
- Aphids (Hemiptera: Aphididae) - oviposition siteFemales deposit directly into bodies; the parasitized aphid must then be captured by a crabronid and transported to its nest for the cuckoo wasp to complete.
- Crabronidae (solitary wasps, especially Pemphredon and related genera) - The cuckoo wasp larva develops in the crabronid nest, feeding on the food provisions (paralyzed aphids) intended for the larva.
Behavior
Based on observations of related Omalus , females have been documented to oviposit directly into living aphids rather than entering nests. This indirect parasitic strategy relies on the subsequent capture of the parasitized by a crabronid that stocks its nest with aphid prey. The cuckoo wasp larva hatches inside the host nest, kills the crabronid larva, and consumes the stored food provisions.
Similar Taxa
- Omalus puncticollisCongeneric with similar size, metallic coloration, and cleptoparasitic involving aphids and crabronid .
- Omalus violaceusAnother congeneric documented exhibiting the same -oviposition ; identification to species level requires close examination.
- Pseudomalus auratusSimilar small size, metallic coloration, and cleptoparasitic habits in twig-nesting solitary and nests; Pseudomalus often show more contrasting color patterns.
- Holopyga speciesRelated chrysidid with similar indirect cleptoparasitic involving aphids and crabronid .