Native SpeciesGiant water bug

FOUND by flyfishing622
ID Confirmed
Quality checked by Jenny B.
Peer reviewed by Jenny B.
Field Notes
We found bigger macroinvertebrates in the calm water than in the rougher conditions. Two people collected for 25 minutes and found 12 mayfly nymphs,2 crane fly larvae,1 Dragonfly nymph,1 giant water bug and 4 stonefly nymphs.
A sketch of our study site.
Supporting Evidence
Photo of my evidence.
This water bug has one pair of forelegs that are wide set and elbowed as Giant water bugs are known to have.
Photo of my evidence.
Wings overlap to form an x-shape. We know that Giant water bugs have this feature.
Photo of my evidence.
Has a pair of appendages at the end of its abdomen. This distinguishes it from other species of water bug.
Species Observation: Species Looked For
Did you find it?: 
I think I found it
Scientific name:
Common name:
Giant water bug
Count of individuals: 
How big is it?: 
2 - 5 cm
Is it male or female?: 
Can't tell
Sampling method: 
Photo of our sampling method.
Place Studied
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Map this species
N 44.153500 °
W -70.603050 °
Observation Site Information
A photo of our study site.
Freshwater - In a stream or river
Trip Information
Crooked River 1
Trip date: 
Wed, 2017-11-15 15:00
Town or city: 
Type of investigation: 
Species and Habitat Survey
Crooked River
MIDAS Code: 
Habitat Observations
Species diversity: 
5 different species
Evidence of vectors: 
Paved road
Dirt road
Water temperature: 
Dissolved oxygen: 


I didn't know there was giant water bugs. That bug looks sleek!

This is such a cool observation. Please make sure you post the correct coordinates so your post lives on.


Hi! Thanks for your comment; I thought the GPS coordinates had already been corrected! I'll try to get them fixed, but just fyi they are N 44.09.210
W 070.36.183

Great pics again! I have only seen one of these- looks like this will be a site to visit for fly fishing in the spring! I appreciate that you included where you were finding your macros- why do you think you found bigger species in the calm water?

I think it's probably because they don't have the right equipment to latch onto the rocks in moving water. In the case of the Giant Water Bug, it needs to come to the surface to breathe so that might affect it's habitat choice too.

Thanks for your comment!

Hi again,

It looks like your coordinates are off on this observation as well. Please comment below with the correct coordinates (in decimal degrees) and we will update your observation.

-The VS Team-

Hello! The correct coordinates are N44.09.210 W070.36.183. I thought they had already been changed until someone told me otherwise. Thank you!

Having a hard time interpreting your coordinates. For Vital Signs, the coordinates must be decimal degrees. I think what you have shared might actually be degrees + decimal minutes. Plugging those into this website ( - I put your updated coordinates in as Latitude degrees: 44, minutes: 9.210 and longitude degrees: -70, minutes: 36.183). When I did that I got the following decimal degrees and have updated your coordinates to that point 44.153500, -70.603050.

Can you please zoom way way in on the map and confirm that your data is now in the correct location?

The various formats for latitude and longitude can be confusing, but make a big difference in where your data lands on the map. Thank you for helping us make sure we get you in the correct spot.

-The VS Team

We checked the map and the coordinates are correct. Thank you for helping us to fix our mistake. We were using a new GPS device and were still getting used to it. Hopefully next time we'll get it right the first time!

Great! Glad we could get you in the correct spot.

You should be able to adjust the settings on your GPS unit for decimal degrees (the option might look something like "ddd.ddddd" in the drop down menu of options).