Researcher Rediscovers Rare Firefly Species in Delaware

Entomologist Christopher Heckscher found a firefly thought to be lost for over four decades in a state park.

Updated on Oct. 24, 2026 in Botany

A small firefly glowing with soft amber light in a dark, lush forest, representing a rare entomological discovery. — Entomologist Christopher Heckscher rediscovered the rare Pyractomena similis firefly at Delaware's Brandywine Creek State Park, marking the species' first sighting since 1983. AI Illustration. Upload story photo >

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Between May and June 2026, entomologist Christopher Heckscher rediscovered the firefly species Pyractomena similis at Brandywine Creek State Park. This marks the first documented sighting of the insect since 1983.

Why it matters

The species was previously considered lost simply because no researchers had actively searched for it. This finding suggests that many of North America's missing firefly populations may still exist if scientists dedicate resources to locate them.

The discovery involved tracking the insect's amber-colored flash pattern, which consists of 10 to 20 pulses. Confirmation was achieved by examining genitalia under a microscope, distinguishing it from 170 other North American species.

The players

Christopher Heckscher

He is an entomologist and ecologist at Delaware State University who specializes in the study of insect populations.

The details

Christopher Heckscher, an ecologist at Delaware State University, identified the fireflies through their distinct rhythmic pulsing and amber flashes. The discovery of the small group of eight to 12 individuals validates the presence of a species that had been missing from scientific records for 40 years.

The species was last documented in 1983.
The firefly was rediscovered between May and June 2026.

The Big Picture

The rediscovery of Pyractomena similis marks a departure from the assessment that 28 firefly species are considered lost in North America by proving population persistence. This finding suggests that systematic field research could significantly alter current conservation data.

This discovery highlights the importance of maintaining local biodiversity within state parks for future ecological study. It underscores how citizens and researchers can work together to monitor and protect unique insect habitats found in their own backyards.

The takeaway

This discovery demonstrates that the absence of recent sightings does not necessarily mean a species has gone extinct. It serves as a reminder that targeted field searches are essential for updating our understanding of local biodiversity.