Observation: Pyractomena angulata
Primary Observer:
Katie Hietala-Henschell
Event Date:
2026-06-28
Status:
Survey
Site Name:
Pembina River Route 55 Bridge
Province/State:
North Dakota
Event Date:
2026-06-28
Time of Day:
Night-Time
Start Time:
21:44
End Time:
00:13
Number of Observers:
3
Primary Observer:
Katie Hietala-Henschell
Additional Observers:
Shelby Bjornstad, Jared Farris
target_species_genus:
photuris
target_species_species:
tasunkowitcoi
Location and Habitat
Location Accuracy (meters):
0-25
Habitat Type:
Riparian - Areas Along lake or stream
Habitat Type Notes:
Type locality for Photuris tasunkowitcoi. Willow and box elder were present along the banks of Pembina River creating shrubby conditions. Tall grasses and other herbaceous vegetation along roadside and upslope of riparian corridor.
Elevation (meters):
253
Area Searched (hectares):
1
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:
Moon created bright conditions when not blocked by clouds.
Observation
Observation Type:
With Flash Data
Number Observed:
11-50
genus:
pyractomena
Species:
angulata
Observation Notes:
10:39 pm: 13 mm
10:40 pm: 12 mm
10:50 pm: 12 mm
11:17 pm: 11 mm
11:51 pm: 11 mm
Specimen Voucher Number:
Flash Behavior
First Flash Time:
22:09
Last Flash Time:
00:49
First Flash Temp (F):
73
Last Flash Temp (F):
72
Flashes in Pattern:
1
Flash Color:
Orange
Flash Pattern Period:
2.75
Flash Duration:
0.75
Flash Interval:
2
Male Height Zone:
Low (0-3 ft), Moderate (3-8 ft)
Flash Location:
Flashing occurred in vegetation along river and in field adjacent to river.
Male Flash Behavior:
10:39 pm: orange dim flicker
10:40 pm: orange dim flicker
10:50 pm: 0.5 second flicker flash repeated every 2 seconds (yellow-orange)
11:17 pm: 0.75 second flicker flash repeated every 2 seconds (orange)
11:51 pm: 1 second flicker flash repeated every 2 seconds (orange)
