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Observation: Photinus alexanderi
Primary Observer:
Rachel Irvin
Event Date:
2025-09-12
Status:
Verified
Survey
Site Name:
Onion Creek
Province/State:
Utah
Event Date:
2025-09-12
Time of Day:
Day-Time
Start Time:
16:00
End Time:
16:15
Number of Observers:
4
Primary Observer:
Rachel Irvin
Additional Observers:
Iris McCulloch, Amanda Barth, Adam Sovinsky
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:
The habitat is wet meadow near a creek. Plants in the area include bog violets, a native form of phragmites, wild rose, showy milkweed (closer to the creek), gentian, rubber rabbitbrush, western white clematis, wildrye, cottonwood trees (closer to the creek), and sumac.
Elevation (meters):
1720
Area Searched (hectares):
0.0051
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:
Was observed in the daytime, but there are not any lights that would obstruct the area in the evening. Aside from natural ones like the moon.
Observation
Observation Type:
Non-Flashing
Number Observed:
2-10
Genus:
Photinus
Species:
alexanderi
Observation Notes:
All fireflies were observed on the uppermost portions of the phragmites leaves. They were either sitting still or crawling upward on the plant. One specimen (the one photographed) was measured and was approximately 1 cm long (not including antennae).
Specimen Voucher Number:
Flash Behavior
First Flash Time:
Last Flash Time:
First Flash Temp (F):
Last Flash Temp (F):
Flashes in Pattern:
Flash Color:
Flash Pattern Period:
Flash Duration:
Flash Interval:
Male Height Zone:
Low (0-3 ft)
Flash Location:
Male Flash Behavior:
Female Flash Behavior:
2 thoughts on “Observation: Photinus alexanderi”
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Photinus alexanderi is the expected species in Utah, and the coloration and size fit.
Thanks!