Insect
Photuris pennsylvanica
Photuris pennsylvanicaAlso known as Pennsylvania Firefly, Dot-dash Firefly, Lightning Bug, Glowworm
Pennsylvania fireflies illuminate eastern summer nights with a distinctive flash pattern featuring a short dot followed by a longer dash. Adult females are aggressive mimics that imitate the courtship flashing signals of male fireflies from other genera to lure them in as prey. Their luminescent larvae hunt snails, slugs, and soft-bodied soil organisms among damp leaf litter before metamorphosing.
BioluminescentNocturnalPredatory
—observations
—countries
—peak records
VulnerableConservation statusIUCN Red List categoriesLCNTVUENCREWEXVulnerableRed List categories, explained →
Diet & preyPhotinus Fireflies, Snails, Earthworms
Predators
- Toads
- Spiders
- Bats
ThreatsLight pollution, habitat loss, and pesticide application
HabitatsHumid forests, meadows, wetlands, and suburban yards
Life span1–2 years
Classification
- FamilyLampyridae
- SpeciesPhoturis pennsylvanica
Range data is not available yet.
Interaction riskLow
- Low
- Moderate
- High
- Very high
- Why interaction risk is low
- Safe to observe at a normal distance.
Responsible observation
- Observe at Dusk: Look for yellow-green flashes near damp trees or forest edges in early summer.
- Minimize Artificial Light: Turn off outdoor lighting to allow fireflies to signal and find mates.
- Avoid Trapping: Watch flashing displays outdoors without capturing beetles in airtight containers.
Prey (c) Katja Schulz, some rights reserved (CC BY) · cc-by
Close Relative Jacy Lucier / CC BY-SA 4.0 · cc-by-sa
Image unavailableClose Relative
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