Observation: Photinus marginellus
Primary Observer:
Lacie Baker
Event Date:
2026-06-25
Status:
Unreviewed
Survey
Site Name:
Red Mill County Park
Province/State:
Indiana
Event Date:
2026-06-25
Time of Day:
Night-Time
Start Time:
20:15
End Time:
21:00
Number of Observers:
40
Primary Observer:
Lacie Baker
Additional Observers:
Other observers were part of a public park program.
target_species_genus:
photinus
target_species_species:
pyralis
Location and Habitat
Location Accuracy (meters):
25-50
Habitat Type:
Riparian - Areas Along lake or stream
Habitat Type Notes:
Open, mowed grass area surrounded by oak forest on 2 sides and lightly wooded lake edge on 1 side. Near a nature preserve for the Calumet Headwaters. Third side is parking lot and building.
Elevation (meters):
228
Area Searched (hectares):
1.9721
Artificial Light Sources
Vehicles: Yes
Street Lights: No
Buildings: Yes
Red flashlights of observers.
Street Lights: No
Buildings: Yes
Red flashlights of observers.
Artificial Light Types
Sky Glow (diffuse illumination in the sky): No
Light Trespass (light cast on surfaces beyond its intended target): Yes
Glare (bright light causing visual discomfort): No
Light Trespass (light cast on surfaces beyond its intended target): Yes
Glare (bright light causing visual discomfort): No
Artificial Light Notes:
The observation area was fairly close to the building and parking lot. Vehicle lights were minimal, but may have been present at times.
Observation
Observation Type:
With Flash Data
Number Observed:
2-10
genus:
photinus
Species:
marginellus
Observation Notes:
Very small, perhaps the size of arborio rice grain. Single flash pattern.
Specimen Voucher Number:
Flash Behavior
First Flash Time:
20:20
Last Flash Time:
21:00
First Flash Temp (F):
68
Last Flash Temp (F):
65
Flashes in Pattern:
1
Flash Color:
Yellow
Flash Pattern Period:
Not measured
Flash Duration:
Not measured
Flash Interval:
Not measured
Male Height Zone:
Moderate (3-8 ft)
Flash Location:
At about eye level, between 3-5 feet off the ground, several feet away from trees in mowed, grassy area.
Male Flash Behavior:
Single flash repeated every few seconds at roughly eye level, never very far from the trees.
