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

Subject: unidentifiable front pincer bug
Location: Northern MN (Grand Rapids)
July 8, 2014 7:06 pm
I have no idea what this is. I live in northern mn, I’m originally from Texas, in saying this all the locals have never seen it either. My friend found it crawling across the parking lot of our church.
Signature: doesn’t matter

Water Tiger

Water Tiger

Dear doesn’t matter,
This is an aquatic Water Tiger, the predatory larva of an aquatic beetle, and we cannot fathom why it was in your church parking lot.  Perhaps one of Minnesota’s 1000 lakes is adjacent to the parking lot.  Perhaps someone captured it in a nearby lake and left it in the parking lot.

What's That Bug? does not endorse extermination

Subject: i found this
Location: Florida
June 8, 2014 3:24 pm
What is it?
Signature: bigchew

Water Tiger

Water Tiger

Dear bigchew,
You didn’t indicate where you found this large beetle larva, and we are guessing it came from some aquatic environment because it looks like the larva of a Predaceous Diving Beetle, sometimes called a Water Tiger.  You can compare your image to this image on BugGuide.

What's That Bug? does not endorse extermination

Subject: Small beetle needs identifying
Location: Midlands, UK
March 13, 2014 5:24 am
Hi,
I founf several of these small beetles in a wheat field in the UK. They have light bodies, ridged/bumpy elytra and a dark head. I can’t seem to identify it though. Do you know what species it is?
Signature: H Watkins

Unknown Beetles

Possibly Water Scavenger Beetles

Dear H Watkins,
We don’t recognize your beetles, which means we must research.  Preparing questions and images for posting takes time, and our time this morning is running short, so we are posting your images and we hope to attempt an identification as well this morning, but we may not be able to provide you with a response immediately.

Unknown Beetles

Unknown Beetles

Eric Eaton provides a very interesting identification:  Water Scavenger Beetles
Daniel:
Two of us are thinking the beetles might be water scavenger beetles (family Hydrophilidae).  Not all of them are strictly aquatic as adults, and as Doug Yanega said:  Haven’t they had a lot of rain in the UK this year?  So, if the wheat fields were flooded, or even just “soggy,” it is a fair bet to say that is what the beetles are.
Eric

Another Update from Eric Eaton:  March 17, 2014
Ok, got a more specific reply from Michael Geiser:  “Yup, I would suspect Helophorus nubilus, a species with costate elytra, well-known from wheat fields in England (even reported as a “pest species”). But I’ll wait for Robert’s reply, as he’s the expert…”
So, yes, a water scavenger beetle!
Eric

Another Update from Eric Eaton:  March 22, 2014
Daniel:
Please meet Clive Turner, a coleopterist interested in the beetles, which turn out to be a different species (not Helophorus nubilus, but a different one).  I will let Clive fill you in…..
He is interested in obtaining the specimens if the person who wrote to WTB still has them.  Thanks!
Sincerely,
Eric

 

What's That Bug? does not endorse extermination

Subject: never seen it before..
Location: Bad Dürkheim, Rhineland Palatinate, Germany
March 9, 2014 3:40 pm
hey bugman!
I am from Germany, exactly from Rhineland Palatinate.
So I opend the trunk of my car yesterday and a huge bug just lay there.. It tried to cover up, I guess.
It was already dead when I found it.
I have never seen something like this! Really big and colour was golden and green, it also got huge eyes.
It would be awesome if you know what kind of bug it is!
thank you!
Sarah
Signature: Sarah

Predaceous Diving Beetle

Predaceous Diving Beetle

Hi Sarah,
This is an aquatic beetle, most likely a Predaceous Diving Beetle in the family Dytiscidae.  Like many aquatic insects, Predaceous Diving Beetles are capable of flying from one body of water to another.  Your individual bears a resemblance to
Cybister laterimarginalis, a European species that is pictured on the Polish website Iconographia Coleopterorum Poloniae and on Wikimedia Commons

Predaceous Diving Beetle

Predaceous Diving Beetle

What's That Bug? does not endorse extermination

Subject: Big beetle in Maine
Location: Small Point, Maine marsh next to ocean
July 27, 2013 5:30 pm
So, I found a bug in the road at a campground and ran it up to my son (since he loves bugs). He didn’t fly and gave my son a good pinch that drew blood. (Two little punctures)
We’re just curious what it was.
He was pretty big (the pic shows my husbands hand for reference.).
Signature: Rebecca

Predaceous Diving Beetle

Predaceous Diving Beetle

Hi Rebecca,
This is a Predaceous Diving Beetle, an aquatic predator.  They are not dangerous, but as you and your son found it, they can bite if carelessly handled.  Though they are aquatic, Predaceous Diving Beetles can fly from pond to pond.

Predaceous Diving Beetle

Predaceous Diving Beetle

awesome. it did give him a good bite, which led to blood (exciting!).  we needed to know what type of bug so we can anticipate which superpowers he can be expecting.  thanks!

What's That Bug? does not endorse extermination

Subject: Predaceous Diving Beetle
Location: CT
June 3, 2013 6:24 am
Recently I sent a pic of this former mystery bug, just wanted to save you some time in that I found the ID. Thank you anyway, and I really enjoy your site.
Signature: Cheryl

Subject: Mystery Bug
Location: CT
May 31, 2013 12:51 pm
Hello, I found this bug close to my fish pond here in CT, at first I thought it was a waterbug, but the front legs look different from what I’ve seen before. It could fly, and it had a ungainly and awkward way of crawling. Never seen one of these before, is it a type of waterbug?
Signature: Cheryl

Predaceous Diving Beetle

Predaceous Diving Beetle

Hi Cheryl,
We just returned to the office to find 100s of identification requests, and we know we cannot ever read them all.  We search for good subject lines, and though you originally requested our assistance, and we failed you, we are happy you did identify your Predaceous Diving Beetle and we are thrilled to be able to post your fine photograph.

Predaceous Diving Beetle

Predaceous Diving Beetle

 

What's That Bug? does not endorse extermination