Notice: Below is a list of 0 important links included on this page.
Please note that while screen readers have made significant strides, they may still lack full support for optimal web accessibility.
Observation: Photinus pyralis
Primary Observer:
Brandie Dunn
Event Date:
2025-08-02
Status:
Verified
Survey
Site Name:
BF
Province/State:
Illinois
Event Date:
2025-08-02
Time of Day:
Night-Time
Start Time:
20:15
End Time:
22:00
Number of Observers:
4
Primary Observer:
Brandie Dunn
Additional Observers:
Tom Simpson, Michael Dunn, Ders Anderson
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:
Jewelweed, Joe Pye weed, cattails, Bog/fen bordering oak woodland that increases in elevation as you enter woodland to north. We followed trail into woodland to the west towards opening to meadowy area, passing a seep along the way. The oaks and tall tree canopy block moonlight for the most part.
Elevation (meters):
820
Area Searched (hectares):
.16
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:
11-50
Genus:
Photinus
Species:
pyralis
Observation Notes:
15mm. Typical single flash, with dip and movement upwards.
Specimen Voucher Number:
Flash Behavior
First Flash Time:
20:25
Last Flash Time:
22:00
First Flash Temp (F):
65.2
Last Flash Temp (F):
64
Flashes in Pattern:
1
Flash Color:
Yellow
Flash Pattern Period:
10
Flash Duration:
1
Flash Interval:
10
Male Height Zone:
Moderate (3-8 ft)
Flash Location:
At forest clearing. Eye level or a bit higher.
Male Flash Behavior:
A suspended light that drifted upwards.
Female Flash Behavior:
1 thought on “Observation: Photinus pyralis”
Leave a Comment
You must be logged in to post a comment.
Thanks for this observation, Brandie! Nicely documentation all around!