Discover the World of Dobsonflies: 10 Fascinating Facts

Did you know that DC comics launched a whole villain named after the larvae of dobsonflies? Read on to learn more such interesting facts about these insects.

The insect world never fails to amaze us with its diversity. If you are into nature and love to learn about insect species, the dobsonfly should pique your interest like no other moth.

The dobsonfly is one of the largest members of the insect world. It starts its life out as an aquatic bug and ends it flying in the skies.

It is most common in the Western Hemisphere, although you may also come across them in Central and North America.

Currently, there are30 species of dobsonflies around the world, but only one is common in the United States: the eastern dobsonfly (Corydalus cornutus)

Dobsonfly Interesting Facts

So, of all insects in the world, why would you want to learn more about dobsonflies? Let’s have a quick look at some dobsonfly facts:

They live their entire lives as larvae.

The life cycle of a dobsonfly is one of the most intriguing details about this species. The bug gets to spend only a tiny fraction of its life cycle as a mature adult.

The larval stage alone lasts three to four years, making the total lifespan of a dobsonfly quite impressive.

After this, the pupal stage lasts a few months, from winter to spring. Once the adults emerge, they live only up to a week at most – just enough to reproduce.

Hence, despite having a total lifespan of several years, these moths live only a few days as adults.

The adult stage is so short that at this point, they don’t even eat! They use their food stores from the pupae stage to find a mate and bring the next generation forward.

These bugs are hard to find: they only live near running water.

Dobsonflies are quite common, and you can find them all over the world. However, they’re especially abundant in Africa and Asian countries like Vietnam and China.

You can also find dobsonflies in Australia, Central America, and North America, although their subspecies aren’t as diverse in the western part of the world.

In the US, you will mostly find the eastern dobsonfly. In total, there are nine genera of dobsonflies, comprising dozens of species in total.

Their habitat is limited to places that are near rivers or running streams of water, where they live their lives as larvae, and then even as moths, they don’t go very far.

Some of them are large enough to cover your face.

Remember we mentioned that the dobsonfly is one of the world’s largest insects? You might be wondering exactly how big they are.

Well, these bugs can grow up to five inches long, and their wingspan may reach up to eight inches.

To give you a more visual example, a dobsonfly is large enough to cover most of your face. Don’t try to imagine it, or else you will have nightmares for the rest of the week!

However, not all species of dobsonflies are equally large. The five-inch-long ones are more predominant in Asian countries, especially China and Vietnam.

Some dobsonfly species are only two to three inches long. Moreover, the females are significantly shorter, not the least because they don’t have large mandibles in the front.

Regardless, this doesn’t rule out the fact that the dobsonfly has impressive dimensions.

They look like something out of a horror movie.

Dobsonflies share quite a resemblance with dragonflies, especially with their wings spread apart. Like dragonflies, they have four veined and translucent wings.

However, dobsonflies cannot fly as well as dragonflies.

The color of these soft-bodied insects varies between yellow and dark brown. The exoskeleton comprises three segments, and like most insects, dobsonflies have three pairs of legs.

The mandibles of a dobsonfly are easily noticeable due to their large size and sickle-like shape.

Although the adult forms vary from one subspecies to another, the basic shape and structure mostly remain the same.

Despite their appearance, they are mostly harmless.

The large size of a male dobsonfly, together with their sickle-shaped mandibles, can make them quite scary, but those mandibles are all bark and no bite. The real biters are the females.

The males cannot bite – the mandibles are mostly used to defend against mating rivals. Even if a male dobsonfly bites you, it would just feel like a strong poke because the mandibles don’t have enough leverage to do any serious harm.

However, we can’t say the same about female dobsonflies.

Although the female dobsonflies have smaller jaws, their mandibles are strong, and they have sharp pincers capable of dealing powerful bites.

If you handle one of them carelessly, you might even end up with a bleeding wound. However, you can breathe a sigh of relief since they won’t bite you deliberately agitate them.

Thankfully, neither the males nor the females are venomous, and the pain from the bite doesn’t last very long.

The larvae form of dobsonflies is called hellgrammite – and these critters are also strong biters. However, you would be hard-pressed to find one around since they live in the water.

They don’t like flying, but they aren’t bad at it either.

Despite having large wings similar to dragonflies, these bugs are nowhere as good as dragonflies when it comes to flying.

Although their exact flight speed is still unknown, they fly in a rather shaky and trembling manner.

However, they can still cover a significant distance when looking for a new water body.

Hellgrammite Interesting Facts

Now that you gathered some interesting knowledge about dobsonflies let’s learn about the larvae of dobsonflies – the hellgrammites.

The insect spends most of its time in the larval stage: this article would be incomplete if it didn’t cover hellgrammites as well.

They live their lives underwater.

Unlike adult dobsonflies, which move to land after pupation, hellgrammites are completely aquatic.

They prefer to live in shallow and fast-flowing parts of rivers, streams, and creaks, usually hiding under logs or rocks.

One of the most interesting things about hellgrammites is that they prefer to live in clean waters with well-balanced pH levels.

If you find these larval bugs in your backyard pond or dobsonflies near it, that means your pond is quite clean.

Even trace amounts of pollutants cause these insects to seek a different water body.

They eat a lot of aquatic pests and are great for keeping water bodies clean.

While dobsonflies don’t feed as adults, their larvae are aggressive predators in the water.

Hellgrammites hunt and feed on a variety of other aquatic insects, mayflies, immature chironomid midges, stoneflies, and even small fish.

Also, you should note that hellgrammites are fish food themselves. Anglers often use these larval insects as fish bait.

DC named a comic villain after them.

This insect looks a tad gross in their larval stage, somewhat resembling a centipede. They are so ugly; DC actually made a comic villain named after them!

They are generally black, tan, or dark brown, with flattened and elongated bodies.

In addition to the three pairs of legs, the abdomen also has eight pairs of leg-like appendages on the sides. Each of these appendages has a hairy or cottony gill tuft at the tip.

Each of the actual legs has a tiny pair of pincers beside the mandibles in front of the thorax.

Hellgrammites also have a pair of hooked leg-like appendages at their rear end that allows them to anchor to the surface and prevent themselves from getting washed away in the current.

They are usually two to four inches long.

They live their lives in the water, but that’s not where they lay eggs

Although hellgrammites are aquatic, adult dobsonflies don’t lay eggs in water.

Instead, they lay eggs in shady vegetated areas adjacent to water bodies or rocks poking out of the water’s surface.

Female dobsonflies can lay up to 3,000 eggs in the form of large egg masses. These egg masses resemble bird droppings which often get overlooked by predators.

The eggs take about two weeks to hatch. Once it’s time, the egg mass turns liquid. The hatchlings can now drop into the water and continue their lifecycle.

Wrap Up

We hope by now we have been able to pique your interest in dobsonflies! These insects look really scary, but they are actually gentle creatures who can’t do you much harm.

Thank you for reading, and keep on exploring the amazing world of insects!

]