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Observation: Not_a_firefly_na Not a firefly (N/A)
Primary Observer:
Marnie Sadri
Event Date:
2025-08-03
Status:
Unverified
Survey
Site Name:
Lower Rio Grande vacation
Province/State:
Texas
Event Date:
2025-08-03
Time of Day:
Night-Time
Start Time:
20:33
End Time:
22:00
Number of Observers:
3
Primary Observer:
Marnie Sadri
Additional Observers:
MARNiE SADRi, Harper Sadri, Kian Sadri
Target Species Genus:
unknown
Target Species Species:
unknown
Location and Habitat
Location Accuracy (meters):
0-25
Habitat Type:
Developed - Sub/urban areas; parks/gardens
Habitat Type Notes:
This subdivision has been here since the 1940s but each house seems to be on at least least 3 acres. (We've rented this cottage for a few days)
Elevation (meters):
7.925
Area Searched (hectares):
1.61
Artificial Light Sources
Street Lights: Yes
Buildings: Yes
Buildings: Yes
Artificial Light Types
Light Trespass (light cast on surfaces beyond its intended target): Yes
Artificial Light Notes:
The fireflies were more abundant in the darker areas
Observation
Observation Type:
Non-Flashing
Number Observed:
50+
Genus:
not_a_firefly_na
Species:
Not a firefly (N/A)
Observation Notes:
There were hundreds of species next door at 141 North Valencia. I am fairly certain that herbicides and insecticides have been used at this location where we stayed (143 n Valencia) but I have no idea about their use of pesticides or other chemicals next door where we saw the most abundant number of fireflies 100's As opposed to a few fireflies here at 143 n Valencia. Some of the fireflies would come through the fence so we could observe them up close. They were landing in the grass. It appeared there were multiple species as some had a very long flash while others flashed on and off. This location is directly next to water.
Specimen Voucher Number:
Flash Behavior
First Flash Time:
Last Flash Time:
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Last Flash Temp (F):
Flashes in Pattern:
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Male Height Zone:
Flash Location:
Male Flash Behavior:
Female Flash Behavior:
1 thought on “Observation: Not_a_firefly_na Not a firefly (N/A)”
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Thanks for submitting this observation! The beetle you photographed is actually not a firefly, but rather a firefly “cousin” called the Texas glowing click beetle. See this observation on iNaturalist: https://www.inaturalist.org/observations/303764494
While fireflies light up from the bottom of their abdomen, glowing click beetles light up from two spots on the top of their thorax and one on the bottom of their abdomen.