Tiny Larvae Hanging From Thread on Bedroom Ceiling

larvae on thread

We received an interesting and highly detailed question from a reader recently who found a few tiny larvae in his room. The reader first noticed the larvae when they were lowering themselves onto his bed using a thread attached to the ceiling. The reader found several larvae, and traced their place of origin to a place in the ceiling, which is where the threads were attached. The reader thought he might have found moth fly larvae, but we actually think he found some sort of inchworm for reasons we will now outline.

The reader sent in a few good photos, but the larvae he found are so tiny that they are difficult to see in every photo. Because of the lighting, the larvae is easiest to see in the following image, which is actually kind of beautiful in its own way:

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larvae on thread

Essentially everything the reader says about what he found suggests he found some sort of inchworm, a creature we have written about a number of times. Indeed, we have written about inchworms hanging from threads in the kitchen, and we have written about an inchworm gathering in the laundry room. We have also written about inchworms on threads outside, which is where most inchworms are observed. (If people know of inchworms at all, they know them as tree pests – species like fall and spring cankerworms are common in North America and often seen feeding on deciduous trees and shrubs, which can damage the plant’s health.) So, we have some experience dealing with inchworms, and we think this is what the reader found. Not only are these larvae capable of rappelling by thread, as the reader observed, but they can also be quite small, and the creatures above are certainly small. The picture also shows a larva in the middle of its characteristic inchworm gait, described in detail in an article about red inchworms. (Essentially, they “inch” along.)

We should note that inchworms are not actually worms, but the larval form of geometer moths. Thus, when the reader speculated that he found moth fly larvae (and, as a side note, he had good reasons for doing so), he was on the right track because he did in fact find a larva – the larval form of a moth, also known as a caterpillar. (Caterpillars are just the larval form of moths and butterflies.) The reader did mention that he thought he saw moth flies around his room, but perhaps these were actually geometer moths. There are tens of thousands of different species, so they come in a variety of shapes and sizes, and some may look like moth flies. (We know that several geometer moths are grey and somewhat small, for example, and these might be mistaken for moth flies.)

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Overall, we think there is a good chance our reader found inchworms. The circumstances imply as much, and the picture above appears to be of an inchworm.

Tiny Larvae Hanging From Thread on Bedroom Ceiling
Article Name
Tiny Larvae Hanging From Thread on Bedroom Ceiling
We received an interesting and highly detailed question from a reader recently who found a few tiny larvae in his room.

5 thoughts on “Tiny Larvae Hanging From Thread on Bedroom Ceiling

  1. hi…

    I found these 2″ to 3″ & another 4″ to 6″ strand of (Have no idea what it is) hanging from the ceiling in my Master Bedroom, and Bathroom. .

    It was thicker than a strand of hair. When I went to grab it with a tissue, it disintegrates down from the ceiling onto the floor. It’s like a ashes from a cigarette. Whatever insect or thing it is, it looks as if it attaches to the ceiling then grows downward, just hanging.

    Noticed there have been small little gnats that I’ve killed hovering on the ceiling… Are they gnats, and do gnats do such things.? It’s not coming from the attic, and growing from inside there, then hanging down thru the sheet rocked ceiling. That theory is out the door.

    Anybody in the Mesa, Arizona had similar problems?

  2. Hi I have just found a bunch of these in my bathroom hanging from the ceiling. I have a pretty good picture and a video of on i put on the counter. I would also like to know how to kill them. If they bite or are dangerous/poisonous and how to prevent them from coming back

  3. Hi! I have a question. So i found the same things, as you said in this article, they are an inch. But the ones i found were not even a centimeter! They also had a black head and i found them crawling on my bathroom mirror. My questions are, how do i kill them? Will they hurt me? And how do i prevent more from coming into my house? I only found them on my bathroom mirror and my dad wshed them out with water. I need some answers, i dont know what theyll do after a while…

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