Currently viewing the tag: "Aquatic Bugs"
What's That Bug? does not endorse extermination

Subject:  Found dozens dead by the river
Geographic location of the bug:  Western Massachusetts
Date: 08/14/2019
Time: 08:45 AM EDT
Your letter to the bugman:  Hello bugman-
I was walking by the river this morning and found dozens of these bugs dead on small rocks. I cannot identify them. Do you know what they are? And is it normal to come across what seems like a mass death? Thanks for any insight you can provide and keep up the amazing work!
How you want your letter signed:  Best wishes, Lucy

Stonefly Exuviae

Dear Lucy,
These are not dead insects.  They are the exuviae or shed exoskeletons of Stonefly naiads.  The aquatic larvae of Stonflies are aquatic, and when they approach maturity, they climb out of the water and molt for the final time, emerging as winged adults.  You did not encounter a “mass death” but rather, evidence of a mass emergence.

That is amazing! Thanks so much for letting me know. I’ll read up on this. So cool…
Every day in the woods is a new adventure. So much to learn and be awed by.
Thanks again for taking time to explain. I truly appreciate it.
Warmest regards,
Lucy
What's That Bug? does not endorse extermination

Subject:  biting swimmer in pool
Geographic location of the bug:  Queen Creek, AZ
Date: 06/08/2019
Time: 04:38 PM EDT
Your letter to the bugman:  We have found this type of bug in our Arizona pool (more than once). It swims very fast, it is not a water boatman, the legs are different and all go the same direction. Also it swims belly down. It has 6 legs, 2 small antennae, and it appears to use a bubble on its underside to help it go up to the surface and down again. It also bites (or stings), and if a person is in the pool nearby, it will make a beeline for them. Very aggressive for a little creature. (the 3rd photo is not 2 bugs, but a reflection on the side of the glass it was in).
Nobody seems to be able to identify it. Thank you in advance for your help!
How you want your letter signed:  Zonie Girl

Water Scavenger Beetle

Dear Zonie Girl,
Thank you for pointing out and for having documentary images showing the position of the legs while swimming.  The is a Beetle, and based on information on BugGuide, including “Aquatic forms may superficially resemble Dysticidae but can be easily distinguished by antennae. Many have keeled sterna. The adults come up for air head first, and move hind legs alternately (Dysticidae come up for air tail first and move hind legs together, like oars)”, we conclude this is a Water Scavenger Beetle in the family Hydrophilidae.  Though the bite might be an annoyance, we do not believe it poses any threat to humans.

Water Scavenger Beetle

Thank you for the quick response! I looked these up online, and yes, that is exactly what this bug is.

Water Scavenger Beetle

What's That Bug? does not endorse extermination

Subject:  Found multiple of the same type of Bug in pond.  What is it?
Geographic location of the bug:  Massachusetts
Date: 06/05/2019
Time: 07:57 PM EDT
Your letter to the bugman:  Found this in the pond in my backyard, no idea what it is.
How you want your letter signed:  Alexander

Water Tiger

Dear Alexander,
These are Water Tigers, the predatory larvae of a Predaceous Diving Beetle in the family Dytiscidae.

What's That Bug? does not endorse extermination

Subject:  Freshwater bug
Geographic location of the bug:  East Kootenay, British Columbia
Date: 06/03/2019
Time: 10:44 PM EDT
Your letter to the bugman:  Found this insect floating in a freshwater lake in late May.
6 legs, approximately 2” long.
Found another smaller specimen the next day.
Suspect type of dragon fly larva but never seen one with these mouth appendages
How you want your letter signed:  David

Water Tiger

Dear David,
This is a Water Tiger, the predatory larva of a Predaceous Diving Beetle.  It breathes air through a siphon at the tip of its abdomen which is why you found it floating.  Here is a BugGuide image for comparison.

Water Tiger

What's That Bug? does not endorse extermination

Subject:  Water bugs
Geographic location of the bug:  Arkansas
Date: 05/25/2019
Time: 10:47 PM EDT
Your letter to the bugman:  I was out cleaning the pool because it hasn’t been cleaned since we moved in and I saw some weird looking bugs. I’ve never seen anything like them and I tried googling it but nothing showed up so you’re my last hope. I’m also very sorry that the pictures aren’t well lit but it’s all I have.
How you want your letter signed:  Chloe

Dragonfly Naiads

Dear Chloe,
These are the aquatic larvae of Dragonflies, commonly called naiads.  They are aquatic predators that will help to naturally control populations of Mosquitoes. 

What's That Bug? does not endorse extermination

Subject:  Pool creature?
Geographic location of the bug:  Tennessee
Date: 05/12/2019
Time: 08:17 PM EDT
Your letter to the bugman:  My sister had me come look at her pool over these things eating the tadpole eggs in the filter.
How you want your letter signed:  Kitty

Water Tiger

Dear Kitty,
This is a Water Tiger, the predatory larva of a Predaceous Diving Beetle.  These larvae breathe through a siphon at the tip of the abdomen that breaks the surface of the water.

What's That Bug? does not endorse extermination