Observation: Photinus marginellus
Primary Observer:
Mary Patterson
Event Date:
2026-07-13
Status:
Unreviewed
Survey
Site Name:
Mill Creek Falls Nature Preserve #3
Province/State:
Pennsylvania
Event Date:
2026-07-13
Time of Day:
Night-Time
Start Time:
20:25
End Time:
21:41
Number of Observers:
2
Primary Observer:
Mary Patterson
Additional Observers:
Ross Patterson
target_species_genus:
unknown
target_species_species:
unknown
Location and Habitat
Location Accuracy (meters):
25-50
Habitat Type:
Grassland/Meadow - Meadow, open, grasses dominant
Habitat Type Notes:
Woodland edge of meadow and trail head were all those areas meet. Some of the meadow area surveyed is a power line cut with woods on either side creating a 'edge' habitat
Elevation (meters):
155
Area Searched (hectares):
2
Artificial Light Sources
Vehicles: No
Street Lights: No
Buildings: No
Street Lights: No
Buildings: No
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:
There was one very small light quite far away, far enough away that it did not shine on survey area but could be seen through woods. It was a light on a sign
Observation
Observation Type:
With Flash Data
Number Observed:
2-10
genus:
photinus
Species:
marginellus
Observation Notes:
Specimen Voucher Number:
Flash Behavior
First Flash Time:
21:20
Last Flash Time:
21:41
First Flash Temp (F):
74
Last Flash Temp (F):
72
Flashes in Pattern:
1
Flash Color:
White
Flash Pattern Period:
3
Flash Duration:
.5
Flash Interval:
3
Male Height Zone:
Moderate (3-8 ft)
Flash Location:
above meadow
