Perilampus stygicus
Provancher, 1888
Perilampus stygicus is a small parasitic wasp in the Perilampidae, measuring 1.3–5.5 mm in length. It is a hyperparasitoid, with larvae that parasitize other parasitic insects such as tachinid flies, ichneumon wasps, or braconid wasps living inside caterpillars or other insect larvae. The exhibits a distinctive triangular or inverted pyramid-shaped and short, strongly elbowed that help distinguish it from similar-looking cuckoo wasps (Chrysididae).
Pronunciation
How to pronounce Perilampus stygicus: //ˌpɛrɪˈlæmpəs ˈstɪdʒɪkəs//
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Identification
Distinguished from cuckoo wasps (Chrysididae) by the triangular or inverted pyramid-shaped with sharp corners, versus the oval or rounded abdomen of cuckoo wasps. Has short, strongly elbowed . Many perilampids are metallic green or blue, though some are wholly black; specific coloration for P. stygicus is not documented in available sources.
Habitat
Associated with vegetation where occur, including plants with colonies and sunflowers with extrafloral . are deposited on leaves, buds, cracks in bark, and under lichens.
Distribution
Recorded from District of Columbia, Kansas, Louisiana, Maine, Maryland, and North America north of Mexico.
Host Associations
- Tachinidae - hyperparasitoidlarvae parasitize tachinid fly larvae
- Ichneumonidae - hyperparasitoidlarvae parasitize ichneumon larvae
- Braconidae - hyperparasitoidlarvae parasitize braconid larvae
- Caterpillars - indirectsecondary containing primary hosts
Life Cycle
Female broadcasts on vegetation, laying up to 500 eggs on leaves, buds, bark cracks, and under lichens. First instar is a flattened, mobile larva that attaches to moving objects with its . Upon finding a secondary (typically a caterpillar or other insect larva), the planidium penetrates the and searches for the primary host (a within the secondary host). It enters the primary host and waits until that host pupates, then exits and into a -like larva that feeds externally. Passes through two or three additional instars before pupating inside the host cocoon or . Some Perilampus can complete development on the secondary host if no primary host is present, but this flexibility is not specifically documented for P. stygicus.
Behavior
have been observed feeding on extrafloral and sweet from plant stems. Female exhibits broadcast -laying strategy rather than -targeted oviposition. First instar larvae actively seek hosts by attaching to any moving object.
Ecological Role
Hyperparasitoid that regulates of primary , potentially influencing dynamics in agricultural and natural systems.
Similar Taxa
- ChrysididaeSimilar small size and metallic coloration; distinguished by oval or rounded without sharp corners, versus triangular abdomen of Perilampidae
- PteromalidaeHistorically lumped with Perilampidae in some classifications; separation requires detailed examination of morphological characters
More Details
Classification History
Perilampidae classification has been unstable; the has been variously treated as its own family or lumped with Pteromalidae. Members of Chrysolampinae are often placed in Pteromalidae by some authorities.
Larval Adaptation
The larva represents a rare among Hymenoptera for location, functioning as a mobile stage that actively seeks hosts rather than relying on female oviposition .