Perilampus stygicus
Provancher, 1888
Perilampus stygicus is a small parasitic in the , measuring 1.3–5.5 mm in length. It is a , with that parasitize other parasitic such as , ichneumon wasps, or wasps living inside or other insect larvae. The exhibits a distinctive triangular or inverted pyramid-shaped and short, strongly that help distinguish it from similar-looking ().
Pronunciation
How to pronounce Perilampus stygicus: //ˌpɛrɪˈlæmpəs ˈstɪdʒɪkəs//
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Identification
Distinguished from () by the triangular or inverted pyramid-shaped with sharp corners, versus the oval or rounded abdomen of cuckoo wasps. Has short, strongly . Many are metallic green or , 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 . are deposited on leaves, , 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 - parasitize larvae
- Ichneumonidae - parasitize ichneumon larvae
- Braconidae - parasitize larvae
- Caterpillars - indirectsecondary containing hosts
Life Cycle
Female on vegetation, laying up to 500 eggs on leaves, , bark cracks, and under lichens. First is a flattened, mobile that attaches to moving objects with its . Upon finding a secondary (typically a or other 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 molts into a -like larva that feeds externally. Passes through two or three additional instars before pupating inside the host 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 and sweet from stems. Female exhibits -laying strategy rather than -targeted . First actively seek hosts by attaching to any moving object.
Ecological Role
that regulates of , 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
- PteromalidaeHistorically lumped with in some ; separation requires detailed examination of morphological characters
More Details
Classification History
has been unstable; the has been variously treated as its own family or lumped with . Members of Chrysolampinae are often placed in Pteromalidae by some authorities.
Larval Adaptation
The represents a rare among for location, functioning as a mobile stage that actively seeks hosts rather than relying on female .