Observation: Photinus pyralis
Primary Observer:
Negin Almassi
Event Date:
2026-07-06
Status:
Unreviewed
Survey
Site Name:
Undisclosed
Province/State:
Illinois
Event Date:
2026-07-06
Time of Day:
Night-Time
Start Time:
20:22
End Time:
22:15
Number of Observers:
1
Primary Observer:
Negin Almassi
Additional Observers:
NA
target_species_genus:
unknown
target_species_species:
unknown
Location and Habitat
Location Accuracy (meters):
0-25
Habitat Type:
Grassland/Meadow - Meadow, open, grasses dominant
Habitat Type Notes:
Prairie/woodland edge with nearby cattail retention basin and nearby fen
Prairie plants: big bluestem, common dogbane
Woodland plants: bur oak, red dogwood, gray dogwood, goldenglow
Nearby fen plants: marsh marigold, false turtlehead (Chelone glabra), skunk cabbage
Elevation (meters):
183
Area Searched (hectares):
.5
Artificial Light Sources
Vehicles: No
Street Lights: No
Buildings: Yes
Street Lights: No
Buildings: Yes
Artificial Light Types
Sky Glow (diffuse illumination in the sky): No
Light Trespass (light cast on surfaces beyond its intended target): No
Glare (bright light causing visual discomfort): No
Light Trespass (light cast on surfaces beyond its intended target): No
Glare (bright light causing visual discomfort): No
Artificial Light Notes:
Observation
Observation Type:
With Flash Data
Number Observed:
11-50
genus:
photinus
Species:
pyralis
Observation Notes:
1st species out, about 8:40 pm, 6-7 seconds between flash, yellow-green, J shape
Specimen Voucher Number:
Flash Behavior
First Flash Time:
20:40
Last Flash Time:
21:00
First Flash Temp (F):
73
Last Flash Temp (F):
73
Flashes in Pattern:
1
Flash Color:
Yellow
Flash Pattern Period:
6
Flash Duration:
1
Flash Interval:
6
Male Height Zone:
Moderate (3-8 ft)
Flash Location:
Over mowed grass and prairie areas
