Currently viewing the category: "Water Beetles"
What's That Bug? does not endorse extermination

Subject: aquatic nymph as prey?
Location: Alexandria, VA
July 30, 2016 5:18 pm
Hi, I observed and photographed a Green Heron capture what I think might be a dragonfly naiad or some other aquatic nymph today at Huntley Meadows in Alexandria, Virginia. I wouldn’t expect a species ID, but do you think this is even an insect? I can’t think of another possibility…. Thanks!
Signature: Seth

Green Heron Eats Water Tiger

Green Heron Eats Water Tiger

Dear Seth,
What marvelous images you have submitted.  This larva appears to be a Water Tiger, the predatory, aquatic larva of a Predaceous Diving Beetle in the genus
Dytiscus.  This posting is a marvelous addition to our Food Chain tag.

Green Heron Eats Water Tiger

Green Heron Eats Water Tiger

Green Heron Eats Water Tiger

Green Heron Eats Water Tiger

What's That Bug? does not endorse extermination

Subject: WHATS THIS BUG??
Location: Northern wisconsin forest (grass)
July 16, 2016 1:41 pm
Hello bugman, my name is jacob, and i found a bug in northern wisconsin that i cant identify. Date is july 15. Translucent head, six legs, large pincers, and maybe a stinger? Found at 2pm. Thanks
Signature: Jacob

Water Tiger

Water Tiger

Dear Jacob,
This is a Water Tiger, the predatory aquatic larva of a Predaceous Diving Beetle.  Since they are aquatic, we don’t understand why you found it on grass in a forest.  See BugGuide for verification of our ID.

Water Tiger

Water Tiger

What's That Bug? does not endorse extermination

Subject: What’s this bug?
Location: Connecticut
July 12, 2016 7:20 pm
Found crawling in yard in CT today, July 12, 2016. Can you help identify? I’m thinking some kind of beetle.
Signature: Rich P

Diving Beetle

Predaceous Diving Beetle

Dear Rich,
This is a Predaceous Diving Beetle in the genus Dytiscus, possibly Dytiscus harrissii that is pictured on BugGuide.  Its range, according to BugGuide, is “transcontinental in Canada, also in the northeastern US and Alaska; most common in the east (in the Great Lakes region), rare in the west.”  Of the entire genus, as this might be a different species, BugGuide notes the habitat is “permanent or temporary freshwater ponds and pools …, plus streams and rivers; usually found on or among aquatic plants” and “adults fly from March to November (varies by species).”  Though this is an aquatic predator, they are capable of flying from pond to pond.  

What's That Bug? does not endorse extermination

Subject: Mystery bug in Maine
Location: Minot, ME
June 4, 2016 3:18 pm
Hello!
Our five year old son was recently catching frogs in the pond at our house and was “bit” by this strange bug. We then noticed that the pond was full of them. They have six legs, are aggressive, swim, also walk on land, two pinchers on the head as well as two small pinchers on the tail.
Signature: Colbath Family

Water Tiger

Water Tiger

Dear Colbath Family,
This is a Water Tiger, a common name for the larva of the Predaceous Diving Beetles in the family Dytiscidae, and it is most likely in the genus
Dytiscus, based on this BugGuide image.

Water Tiger

Water Tiger

What's That Bug? does not endorse extermination

Subject: Green pool bug or shrimp?
Location: Tampa, Florida
April 8, 2016 3:49 pm
Hello,
We came across this “thing” and what we believe to be 100s, if not 1000s, of what we assume to be it’s babies? Because it looks like them, just really smaller. Thank you for identifying this, hopefully, for us.
Signature: Nicole and Jeff

Aquatic Beetle Larva

Aquatic Beetle Larva

Dear Nicole and Jeff,
This is the larva of an Aquatic Beetle, but there is not enough detail for us to be more specific.

What's That Bug? does not endorse extermination

Subject: Swimming pool bug
Location: Canberra Australia
October 22, 2015 9:58 pm
Hi Bugman.
I left my above ground swimming pool uncovered for approx. 6 months over winter. I didnt clean it nor did I add any chlorine. Now that its getting warmer I thought time to clean it out and start getting it healthy again. When doing so I caught 11 of these swimming bugs and I just needed to know more.
They swim to the water surface and sit there facing downwards (with the backsides toward the top).
When I stir the water they dive to the bottom (approx. 600mm) where I can’t see due to the leaves and other garbage – then do not come up for at least 5 minutes.
They appear to have 6 legs, two tails (split) and two clippers or claws on their face. They are very good at staying absolutely still, but when they swim they have a fish like turning movement. It should be noted that when I pulled them out of the water, they had no troubles walking around, moving almost like a scorpion.
I have attached a video and some pics.
This is in Canberra, Australia. Currently October (middle of spring) and heading towards summer.
Appreciate if you had any ideas on what these are?
Signature: thank you

Water Tigers

Water Tigers

These are Water Tigers, the aquatic larvae of Predaceous Diving Beetles in the family Dytiscidae.  There is a nice simple explanation of the life cycle of the Predaceous Diving Beetles on the Australian Museum website where it states:  “Larvae have a siphon (like a snorkel) coming out the end of their body. They stick this siphon out of the water to get oxygen to breathe.”  According to the Missouri Department of Conservation site:  “Larvae, called ‘water tigers,’ are elongated, flattened and can be 2 inches long. They commonly come to the surface to draw air into spiracles (like snorkels) located at the hind end of the body. There are 3 pairs of legs, and the jaws are strong pincers that are used to grasp prey.”  The Natural History of Orange County, California site has some nice images of Water Tigers.  As you can tell by our links, Predaceous Diving Beetles are found in many places on the globe.

What's That Bug? does not endorse extermination