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

Subject:  Strange(r) thing(s)
Geographic location of the bug:  Burgundy france
Date: 06/08/2018
Time: 01:05 PM EDT
Your letter to the bugman:  This bug had large pincers at the front, legs on his front half and moved like someone dancing the worm. It was about an inch long and very aggressive. If provoked it would curl up back on itself.
How you want your letter signed:  C. McCarthy

Water Tiger

Dear C. McCarthy
Was it found near or in water?  It looks to us like an aquatic beetle larva, commonly called a Water Tiger.

Hi Daniel,
Yes, it was near a small pond. Thanks for the quick positive identification, it helped solve a little debate with the family 🙂

What's That Bug? does not endorse extermination

Subject:  found in water
Geographic location of the bug:  Minnesota
Date: 02/11/2018
Time: 01:55 AM EDT
Your letter to the bugman:  Found this bug came up my ice fishing hole looks like it is connected to a stick
How you want your letter signed:  any


Dear Any,
This is the aquatic larva of a Caddisfly, commonly called a Caseworm because the larva constructs a shelter from twigs, pebbles, shells or other materials as a means of protection.  Each species of Caddisfly constructs a different looking shelter.

What's That Bug? does not endorse extermination

Subject:  Bug in freshwater fountain
Geographic location of the bug:  Victoria Australia
Date: 02/07/2018
Time: 05:00 PM EDT
Your letter to the bugman:  Hello,
We have a fresh water pond with running water along a pot. This is at the top of the pot and these hanging in the water. Fixed by their back end, hanging down, and with two antennae like.
They are 6-8mm in length and in a group of about 20!
They seem the wrong shape for the mosquito larvae I have seen, but not sure if they are!
Thanks for your help
How you want your letter signed:  Julien

Black Fly Larvae

Dear Julian,
Your query has us quite intrigued.  We concur that these are NOT Mosquito Larvae.  Mosquito Larvae breathe through a siphon and they congregate at the surface of generally stagnant water.  We suspect these are larvae and that they are members of the Fly order Diptera.  We also suspect that in their natural environment, they affix themselves to rocks in flowing streams.  We located this image on SlideShare of some aquatic Dipteran larvae and several resemble your individuals.  At this point, we suspect this might be a member of the Black Fly family Simulidae, and according to BugGuide:  “Larva: brown, gray, or black with light brown head; body cylindrical, somewhat club-shaped; head with prominent pair of mouth brushes used for filtering food from the water” and “larvae develop in running water of all types, from the smallest seepages and streams to the largest rivers and waterfalls; they attach themselves to underwater rocks and other objects by means of small hooklets in a sucker-like disc at the tip of the abdomen.”  Bug Eric has some very similar looking images.  Though they are not Mosquitoes, female Black Flies are blood suckers.  According to BugGuide:  “Black flies attack most severely about sunrise and at sunset — either massively and viciously or in such small numbers that they are scarcely noticeable. They bite painlessly so that you may not be aware of having been attacked until small droplets of blood start oozing from your skin. Black flies often crawl into your hairline or through openings in your clothes before they bite you. Therefore, the bites are usually behind your ears, around your neck and beltline, and on the lower parts of your legs. A typical bite consists of a round, pink, itchy swollen area, with a droplet of fresh or dried blood at the center. When the blood is rubbed away, a minute subcutaneous hemorrhage is visible. This hemorrhage and the surrounding pink area become diffuse and larger, and then disappear within a few days. Itching may continue intermittently for weeks, whenever the bitten area is rubbed. Scratching may cause severe secondary skin infections. Toxins injected during an extended severe attack can cause a general illness sometimes called black-fly fever, characterized by headache, fever, nausea, and swollen, painful neck glands. Attacks occur throughout late spring and early summer (sometimes throughout the summer). (Fredeen 1973)  often ranked third worldwide among arthropods in importance as disease vectors, but only ~10-20% of the world’s spp. are pests of humans/livestock.” According to Atlas of Living Australia:  “Most black flies gain nourishment by feeding on the blood of mammals, including humans, although the males feed mainly on nectar.”

Black Fly Larvae

Dear Daniel,
Thank you so much for looking into that!! Your suggestion and pictures are very convincing. We do have these flies around as well. I have taken pictures again and I think that we can see the one in their cocoon on the bottom and the other one on top!
Your site is a great help!
Best wishes

Black Fly larvae and pupae

What's That Bug? does not endorse extermination

Subject:  Multiple tiny bugs wriggling like crazy in pool
Geographic location of the bug:  Victoria, Australia
Date: 01/10/2018
Time: 01:21 AM EDT
Your letter to the bugman:  Hello Bugman! As it’s summer we set up a blow up pool in our back yard and today as I was having a dip I saw multiple tiny little wormy bugs aggressively writhing around in the water. I started feeling slightly itchy on my back so freaked out and jumped out, but I managed to grab one of the little guys and take a photo (sorry about the quality my iPhone struggled to get a clear photo).  I also have redness around where I’m itchy but I could just be paranoid and it have been a mosquito. If you could let me know what bug this is I would very much appreciate it 🙂
How you want your letter signed:  Jess

Wriggler: Mosquito Larva

Dear Jess,
This is a Mosquito Larva, commonly called a Wriggler.  The female Mosquito lays her eggs in a floating raft, and the young quickly hatch and develop, molting and growing, and the exact time depends on the temperature.  Controlling aquatic Mosquito Larvae is the best way to reduce the numbers of flying, and biting, Mosquitoes.

What's That Bug? does not endorse extermination

Subject:  Larva of some sort??
Geographic location of the bug:  Perth, Western Australia
Date: 01/02/2018
Time: 09:56 PM EDT
Hi! The weirdness of this situation compelled me to look online for information. This tiny little creature was found in the cistern water of a toilet that had been unflushed for a while. I apologise profusely for the blurry nature of the photos but as you can see from the mm markers it is a tiny little thing, and I took its photo through a magnifying glass with my phone. Thank you 🙂
How you want your letter signed:  Curiously Confused

Mosquito Larva

Dear Curiously Confused,
This looks like an aquatic Mosquito larva or pupa, or some other immature stage of a Fly to us, so finding it in an unused toilet makes sense, but it is puzzling there was only one.  The Department of Medical Entomology site has some images.

What's That Bug? does not endorse extermination

Subject:  Underwater centipede??
Geographic location of the bug:  Alta, CA
Date: 12/08/2017
Time: 12:29 AM EDT
So, our house wraps around the remnants of a historic gold mine with access to the mine from a back door. There is a fresh water spring that flows from miles back, with several small, dammed pools about a quarter mile in. Today while spelunking, we crossed the path of a peculiar centipede looking insect below the water in a pool about 8 to 10 inches deep! He had a sort of swim/crawl movement and I’d say about 3 inches long and a half inch thick. Wondering if he’s a native ethereal dweller or some sort of astral crosser come to us from The Upsidedown.
How you want your letter signed:  the good people of InnerEarth

Aquatic Larva, probably Dobsonfly

Dear good people of InnerEarth,
This is an aquatic larva of a flying insect, and we are relatively certain it is a member of the family Corydalidae, which includes Dobsonflies and Fishflies.  The similar looking larva of the Eastern Dobsonfly is known as a Hellgrammite.  Here is a BugGuide image of a Fishfly larva.  Your larva might be that of a California Dobsonfly,
Neohermes californicus


What's That Bug? does not endorse extermination