Observation: Photinus obscurellus
Primary Observer:
Brandie Dunn
Event Date:
2026-06-15
Status:
Unreviewed
Survey
Site Name:
Glacial Park
Province/State:
Illinois
Event Date:
2026-06-15
Time of Day:
Night-Time
Start Time:
20:30
End Time:
22:00
Number of Observers:
2
Primary Observer:
Brandie Dunn
Additional Observers:
Sylvia Dunn
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:
Grasses, Restored prairie neighboring wetland including cattails.
Elevation (meters):
235
Area Searched (hectares):
3.7
Artificial Light Sources
Vehicles: Yes
Street Lights: Yes
Buildings: No
Street Lights: Yes
Buildings: No
Artificial Light Types
Sky Glow (diffuse illumination in the sky): Yes
Light Trespass (light cast on surfaces beyond its intended target): Yes
Glare (bright light causing visual discomfort): Yes
Light Trespass (light cast on surfaces beyond its intended target): Yes
Glare (bright light causing visual discomfort): Yes
Artificial Light Notes:
There is one very bright street light at end of road. There were occasional vehicles that passed by, with noticeable interference in the courtship display.
Observation
Observation Type:
With Flash Data
Number Observed:
11-50
genus:
photinus
Species:
obscurellus
Observation Notes:
11 mm, observed as we approach wetland area.
Specimen Voucher Number:
Flash Behavior
First Flash Time:
21:26
Last Flash Time:
22:00
First Flash Temp (F):
64
Last Flash Temp (F):
63
Flashes in Pattern:
3
Flash Color:
Yellow
Flash Pattern Period:
1.5
Flash Duration:
.5
Flash Interval:
0
Male Height Zone:
Moderate (3-8 ft)
Flash Location:
Observed on/above vegetation alongside mowed area near roadside
Male Flash Behavior:
Most of the time 2 -3 flashes observed.
