Currently viewing the category: "Caddisflies"
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Subject: Stick looking bug in a stream
Location: Bridgeport, CA
August 21, 2016 10:48 am
I found this bug crawling in the water in a stream near Bridgeport, CA.
Signature: Leonard Powell

Caseworm

Caseworm

Dear Leonard,
This is a Caddisfly Larva, commonly called a Caseworm.  Each species of Caseworm constructs a case for protection that looks distinctly different from the cases of other species of Caddisfly.  The cases may be constructed of sticks, shells, sand, or other debris.

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Subject: What is this?
Location: Calgary Alberta Canada
June 20, 2016 9:10 pm
Hi, I live in Calgary Alberta Canada and now noticed the follow fly, which generally appears in swarms around the house or spruce trees. Flies are out from June to August/September. The only come out I the late afternoon or evening when the temperature begins to cool. During the day they rest on the side of the house or along the soffits. House backs onto a green space and is roughly 100 yards from the bow river. Swarms have become larger in recent years and I’d love to know what they are. They do not bite or sting. Just very annoying and unsightly.
Thanks for your help!
Signature: Angela

Caddisfly

Caddisfly

Dear Angela,
This is a Caddisfly, a member of the order Trichoptera.  Caddisflies are often described as “mothlike” and the fact that you are so close to the river explains why you have so many Caddisflies in your yard.  Immature Caddisflies, sometimes called Caseworms, are aquatic, frequently used as live bait by anglers, and according to BugGuide:  “Most caddisfly larvae are intolerant of pollution; therefore, their presence is an indication of good water quality, and their absence in areas where they previously occurred may be an indication of polluted water.”  Caseworms make cases from a variety of materials, including sticks, sand, pebbles, snail shells, bits of leaves and many other materials, however, each species is very specific about the material used and the shape of the case.  BugGuide also notes:  “Adults rest on nearby vegetation during the day; flight activity begins at dusk. Adults are attracted – sometimes in great numbers – to artificial light” and that agrees perfectly with your account.  More information on Caddisflies can be found on Aquatax where it states:  “Probably the most interesting feature to the non-fishing general public regarding this group is the cases that many of the larvae construct out of various materials. Caddisflies are found in all types of aquatic habitats throughout Saskatchewan. The majority are intolerant of pollution and, as such, are valuable tools for monitoring organic and chemical contamination of habitats.”

Caddisfly

Caddisfly

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Subject: Help!
Location: Central Texas
March 26, 2016 4:48 pm
Can you please help us identify this bug?
Signature: Abby

Possibly Scorpionfly

Possibly Scorpionfly

Dear Abby,
We believe this is a Scorpionfly in the order Mecoptera, but we cannot find any images of individuals with black wings and an orange body on BugGuide other than
Panorpa lugubris, which is definitely not your species.  We are requesting assistance from Eric Eaton.  If possible, can you send additional images showing the insect from a lateral view that would show details of the head and mouthparts?  Thanks.

Eric Eaton poses another possibility
Daniel:
I am thinking this is a caddisfly of some kind.
Eric

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Subject: Water hermit insect
Location: British Columbia, Canada
April 8, 2016 5:34 pm
Hi,
Found this bug in the water. It likes to flap it’s long body to get around as if someone tied it to a chair. It’s quite hilarious. Wondering what it’s diet is as well. It seems to have a long body and white (mini legs) along its body which is noticeable when it comes out to swing itself around. Kind of reminds me like a wormlike-roach in water but I really don’t have an idea what this creature is. Thanks!
Signature: R.

Caseworm

Caseworm

Dear R.,
This is a Caseworm, the aquatic larva or naiad of a Caddisfly, a mothlike insect from the order Trichoptera.  According to BugGuide:  “The aquatic larvae have three pairs of legs and a soft, elongate, segmented abdomen usually hidden inside a case; head well-developed with chewing mouthparts in most species.  Most species live in a mobile case constructed from plant material, algae, grains of sand, pieces of snail shells, or entirely of silk. The case is held together with strands of silk secreted by the larva. In some species the case is attached to a rock, log, or other underwater surface; a few species have no case and are free-living.  The case’s particular shape and construction material is distinctive of the family and/or genus, and can be used in identification. Example: Helicopyschidae larvae use sand grains to build spiral cases that resemble small snail shells.”

Caseworm

Caseworm

Wow, neat. Thanks for your response Daniel!

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Subject: Garden bug
Location: Dorset uk
April 8, 2016 4:15 am
Found this in Dorset UK , it’s spring
Signature: Karen

Caddisfly

Caddisfly

Dear Karen,
This is a Caddisfly, a member of the insect order Trichoptera, a group of mothlike insects with aquatic larvae known as Caseworms.  Because their larvae are aquatic, and because Caddisflies are not strong fliers, they are generally found not far from a source of fresh water.

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Subject: Moth?
Location: Vermilion County, Illinois
September 3, 2015 9:41 am
Hello Bugman,
I found this insect on my office window – I work at a park in East Central Illinois. At first, I thought it could have been a species of snout butterfly, but realized after getting up close – they were antennae. But I don’t know if I’ve ever noticed moths/butterflies having their antennae closed together. It was a cool morning, dew on the grass, light low-laying fog, but he appeared dry and content on my window. Any idea what this could be so I can learn more about this species? Thanks so much!!!
Signature: Lara the NatureNerd

Caddisfly

Caddisfly

Dear Lara the NatureNerd,
Though you were wrong about the identification, you were quite astute to notice the morphological similarities between this Caddisfly and some moths.  Caddisflies begin life as aquatic Caseworms.  Though it is not in a natural setting, we really love your Caddisfly image because of its simplicity, but we did adjust the levels and rotate.

What's That Bug? does not endorse extermination