Common Eastern Firefly
Photinus pyralis
Spanish: Luciérnaga

Photinus pyralis, known by the common names common eastern firefly and big dipper firefly, is the most common species of firefly in North America. P. pyralis is a flying and light-producing beetle with a light organ on the ventral side of its abdomen. This organism is sometimes incorrectly classified as Photuris pyralis, which likely results from mistaking the similar-sounding genus Photuris.
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Cite as: “Common Eastern Firefly (Photinus pyralis) at La Saladita”, La Saladita Field Guide, lasaladita.com/species/photinus-pyralis/, updated 2026-09-26. Observation counts and months come from iNaturalist research-grade records within about 50 km of 17.8375°N, 101.7606°W (the survey box also takes in Zihuatanejo, Ixtapa and Troncones); summary text from Wikipedia where present.