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Observation: Photinus marginellus
Primary Observer:
Brandie Dunn
Event Date:
2025-06-23
Status:
Verified
Survey
Site Name:
Province/State:
Illinois
Event Date:
2025-06-23
Time of Day:
Night-Time
Start Time:
20:40
End Time:
22:00
Number of Observers:
2
Primary Observer:
Brandie Dunn
Additional Observers:
Caity Benkoski
Target Species Genus:
unknown
Target Species Species:
unknown
Location and Habitat
Location Accuracy (meters):
0-25
Habitat Type:
Open Freshwater Wetland - Wetland Bog, fen, freshwater marsh
Habitat Type Notes:
Jewel weed, skunk cabbage, elderberry, joe pye weed, cat-tails
Elevation (meters):
830
Area Searched (hectares):
.084
Artificial Light Sources
Vehicles: Yes
Street Lights: No
Buildings: No
Street Lights: No
Buildings: No
Artificial Light Types
Sky Glow (diffuse illumination in the sky): Yes
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:
Flashing
Number Observed:
50+
Genus:
Photinus
Species:
marginellus
Observation Notes:
9 mm, flashing just above the jewelweed.
Specimen Voucher Number:
Flash Behavior
First Flash Time:
20:49
Last Flash Time:
21:30
First Flash Temp (F):
76.7
Last Flash Temp (F):
76.1
Flashes in Pattern:
1
Flash Color:
Yellow
Flash Pattern Period:
2
Flash Duration:
1
Flash Interval:
1
Male Height Zone:
Low (0-3 ft), Moderate (3-8 ft)
Flash Location:
They were all hovering just above and in the vicinity of the jewelweed, which is about 3 ft high right now.
Male Flash Behavior:
They had a gentle, single, leisurely flash pattern and hovered close to the vegetation. They didn't move fast.
