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

Subject: What is this bug
Location: NE Pennsylvania l
May 24, 2017 5:26 pm
Is this a giant waterbug? The bug pictured is almost 3in in length.
Signature: Mike


Dear Mike,
This is indeed a Giant Water Bug, commonly called a Toe-Biter.

What's That Bug? does not endorse extermination

Subject: Large Army Green Beetle
Location: Terlingua Ranch, West Texas
May 5, 2017 2:37 pm
We found this guy on top of our water catchment barrel in West Texas, next to Big Bend National Park. He was big enough to fit in a teaspoon, which I used to get him out. He sprang off the spoon with those powerful back legs. He didn’t attempt to fly, but it looks as if it has wings of some sort under that hard exterior. I am certainly curious about this one. We see so many unique insects out there, but this one is a mystery. I love his little eyes….
Yes, I did take this photo and you can use it if you would like.
Thank you for any info you could give.
Signature: Jo

Giant Diving Beetle

Dear Jo,
This is a Predaceous Diving Beetle in the genus Dytiscus, and it is an aquatic species that can also fly from one watery environment to another, so finding it on the water catchment barrel makes perfect sense.  At first we thought it must be the Giant Green Water Beetle,
Dytiscus marginicollis, but that species is only reported from the far west, and according to BugGuide:  “posterior yellow band of pronotum broad especially in the middle” and your individual is lacking that band.  Based on this BugGuide image, we now suspect it might be Dytiscus carolinus, though other images of the species show strong grooves in the elytra.  It is described on BugGuide as being “Abdominal sterna colouration reddish to black and elytra with no yellow subapical transverse fascia.”  But for the coloration, that description does fit.  This FlickR image also resembles your individual.  So though we cannot commit to a species, we are confident that this is a Predaceous Diving Beetle in the genus Dytiscus.  Perhaps mardikavana who frequently writes in with identifications might be able to provide a species identification, however we have a previous comment from mardikavana that states:  “I can’t definitely ID it because when you are dealing with dytiscus sp. you need to see the underside as well. “

Correction:  May 14, 2017
Thanks to a comment from Zach Bruder, we learned this is a Giant Diving Beetle,
Cybister fimbriolatus, and according to BugGuide:  “Similar to Dytiscus, but metatarsal claws different. Elytra and pronotum smooth in male. Dilated male protarsus differs in details from that of Dytiscus. Female Cybister has fine furrows on pronotum.”  Here is a BugGuide image of a greenish individual.

What's That Bug? does not endorse extermination

Subject: blood worms
Location: Mount Washington, Los Angeles, California
May 1, 2017 9:18 pm
Though it might make us unpopular with the neighbors, we keep standing water in the yard for wildlife, and we skim with a net daily to feed Mosquito Larvae to the Angelfish, and Boris is still thriving alone in his tank since killing Medea Luna several years ago.  This week the Mosquito Larvae have been replaced by Blood Worms, the larvae of non-biting Midges, and Boris has been greedily eating everyone put in the tank.

Blood Worms



What's That Bug? does not endorse extermination

Subject: Spikey Black inch long larvae/caterpillars?
Location: Sydney, Australia, NSW
April 4, 2017 4:41 am
So a friend of mine found these larvae(?) in his fish pond, dozens of them, they breathe through a snorkel and are almost an inch long. I have yet to see them in person, but I don’t seem to be able to find anything that fits closely and hes never had them before. Maybe of note is that we have had a lot of rain lately so perhaps they are thriving because of all of the fresh rainwater and his pond only has floating duckweed and salvinia. Does he need to be worried about his smaller baby fish if these are carnivorous?
Signature: Ashton

Mosquito Larvae

Dear Ashton,
What kind of fish does your friend have?  We would think fish would gobble up these Mosquito Larvae.  Your friend might want to consider adding some Mosquito Fish to the pond to help eliminate these aquatic larvae that will eventually become blood-sucking, flying Mosquitoes.   Here is a Getty Images image to support our identification.  Here is a larval comparison image from NSW Arbovirus Surveillance & Vector Monitoring Program.  Mosquito Larvae are commonly called Wrigglers.

Thank you for the photo references.
He has koi fish which logically should be eating them.
Its weird though ive never seen wrigglers as large as he was telling me as i personally collect them to feed to my aquarium fish at home. What he explained was that they were the size of grubs. Hes collected wrigglers for his smaller fish for years and has never had ones like these so maybe theyre from a different species of mosquitoe to usual.

Update:  April 10, 2017
On second look, they look a lot like the culex variety. Will have to research mosquitoe varieties in my local sydney area.

What's That Bug? does not endorse extermination

Subject: Beetle ??
Location: London UK
January 24, 2017 4:28 am
Found this gem ( not ) in my fruit from the supermarket. Never seen anything like it. Because it was in with imported fruit I’m guessing it’s not from here ( United Kingdom ). I thought it was a Cockroach, but no antennae . It’s almost 2 inches long.
Signature: Kd

Giant Water Bug

Dear Kd,
This is not a Beetle nor is it a Cockroach.  It is a True Bug and we feel quite certain it is a predatory Giant Water Bug in the family Belostomatidae.  You may be correct that it was imported with fruit as the family is not listed on the British Bugs site.

Thank you Daniel,
Was a bit of a shock finding it.  After receiving your email, I googled it and now know that the one I found is only half size  (( shudders )).
Thanks again

What's That Bug? does not endorse extermination

Subject: Weird insect in NC Linville Gorge
Location: 3050 ft, Shortoff Mountain, Linville Gorge Wilderness, North Carolina.
January 21, 2017 12:19 am
My name is Tyler Goulet. I am in “The Linville Gorge Facebook Group”. One of the members posted a picture and video of what I believe to be some sort of nymph. My friend is a fly fisherman who has taught me a little. Yet even he can’t identify it. We believe it may have been carried in by a bird. The insect was found in the pond on Shortoff Mountain in the Linville Gorge Wilderness. Which is 3050 ft in elevation.
Attached are two pictures of the insect. One in someones hands, it located closer to the edge of water near his thumb and index finger on the left hand. Also a screenshot of the gps coordinates.
Thank you in advance for your services
Signature: Signed by you and to me.

Fairy Shrimp

Dear Tyler,
This appears to be the aquatic nymph or naiad of a Damselfly.  Adults Damselflies are winged and they will frequently lay eggs in temporary ponds.

Correction:  Fairy Shrimp
Thanks to a comment from Black Zarak, we took a closer look and we are inclined to agree that this is a Fairy Shrimp.  The quality of the image is not great, but upon extreme magnification we are able to make out the swimming appendages.  This reminds us that with all the rain we have experienced in Los Angeles the past week, Fairy Shrimp may be hatching in the Rio de Los Angeles State Park in the Cypress Park neighborhood of Los Angeles.

Thank you for the reply.    The group also agreed that it is a fairy shrimp.    But I can’t find any information that would say they’re native to North Carolina.     I could only find states like Oregon, California and Arizona.     Thank you so much again.

Good morning Tyler,
During the 1960s, our editorial staff remembers caught Fairy Shrimp from the order Anostraca in Ohio in seasonal, vernal ponds that dried out in the summer.  BugGuide has data on sightings from nearby Georgia, Kentucky and Massachusetts, but the lack of reports from North Carolina just means no images have been posted from that state.  The Vernal Pools site has some nice information on Fairy Shrimp in Massachusetts and contains this statement:  “Winter eggs can be carried from pools to pool by traveling animals, or, in the case of pools that dry out completely, picked up in the wind and be blown to other pools. For reasons currently unknown to scientists, there is an uneven level of population in a pool from year to year. In a single pool, fairy shrimp may be abundant for several consecutive years and absent the next.”  The Pennsylvania Natural Heritage Program site states:  “Two species of fairy shrimp found in Pennsylvania are the eastern fairy shrimp (
Eubranchipus holmani) and the springtime fairy shrimp (E. vernalis). The most frequently encountered species in Pennsylvania is the springtime fairy shrimp. E. vernalis has straight, smooth antennae, while E. holmani has longer antennae with medial serrations. The image to the right is a close-up view of male Eubranchipus vernalis second antennae. ”

What's That Bug? does not endorse extermination