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Observation: Photinus obscurellus
Primary Observer:
Richard Joyce
Event Date:
2025-06-19
Status:
Unreviewed
Survey
Site Name:
Dwelly Farm Conservation Area - Back Field West
Province/State:
Massachusetts
Event Date:
2025-06-19
Time of Day:
Night-Time
Start Time:
20:41
End Time:
22:15
Number of Observers:
10
Primary Observer:
Richard Joyce
Additional Observers:
Anna W., Ian W., Corey W., Mike B., Christy B., Christy B., Kayla K., Derek C., Jessica S.
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:
Wet field with sensitive fern, goldenrod, red maple and red oak seedlings, grasses, sedges, steeplebush, and yarrow.
Elevation (meters):
306
Area Searched (hectares):
0.1
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): 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:
Only ALAN was sky glow.
Observation
Observation Type:
Flashing
Number Observed:
11-50
Genus:
Photinus
Species:
obscurellus
Observation Notes:
About 10 mm long. Composite long exposure taken at 9:42 PM shows multiple species, including some triplet patterns that may be Photinus obscurellus.
Specimen Voucher Number:
Flash Behavior
First Flash Time:
21:07
Last Flash Time:
22:00
First Flash Temp (F):
73
Last Flash Temp (F):
73
Flashes in Pattern:
3
Flash Color:
Yellow
Flash Pattern Period:
Not recorded
Flash Duration:
Brief, not recorded.
Flash Interval:
0.15 - 0.3
Male Height Zone:
Low (0-3 ft), Moderate (3-8 ft)
Flash Location:
Over herbaceous vegetation in the field, some quite low over the field.
Male Flash Behavior:
Flash patterns of three very quick flashes, with about 0.1-0.3 seconds between pulses. Flash pattern period was not recorded, but was several seconds (3 or more).
Female Flash Behavior:
Not observed.
