Incredible Adaptations: Diving Beetles’ Astonishing Survival Strategies

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Diving Beetle

In this article, we look at some amazing diving beetle adaptations that help them to survive their lives on both land and water.

Beetles are the largest number of insects found on earth (forming around 1/3rd of all insects) and are, by far, the oldest.

Over the years, they have developed some interesting adaptions that allow them to survive in various conditions, from the hot deserts to the still waters of lakes.

The diving beetle is one such type of beetle that can live on both land and water while preying on smaller insects and larvae.

Unlike amphibians, the diving beetle can only breathe atmospheric air, which it carries along with itself underwater.

It also comes in various colors, such as olive, yellow, black, and leathery brown. Let’s learn more about these small yet fascinating creatures.

Diving Beetle Adaptations
Predaceous Diving Beetle

What is a Diving Beetle?

Diving beetles are a type of fresh water-dwelling insects that thrive in the waters of North America, Europe, and Asia.

They are commonly found in slow-moving waters, mostly with lots of vegetation.

Despite being aquatic, they do have wings and mostly fly at night to new waterbodies.

Their navigation relies on reflected moonlight to identify waterbodies – hence they often grass into glass facades.

Like all beetles, they have strong, crushing jaws.

They feed on aquatic life, such as invertebrates, small tadpoles, and other fish and dead insects.

Using their jaws, they incapacitate the prey, tear them into pieces, and finally suck out their juices.

Adaptations of the Diving Beetle

Among the entire beetle family, only 4% are aquatic beetles.

This means that over time, the diving beetle has evolved a number of adaptations that allow them to live and thrive in aquatic environments.

Here are some things that are different:

Diving Beetle

Breathing Under Water

Diving beetles are often referred to as nature’s “scuba divers.” Their bodies are adapted to breathing air.

Before entering the water, they create bubbles underneath their wings (elytra), which they breathe in through their spiracles.

The elytra have two rows of punctures for breathing, which helps distinguish this species from others, such as the water scavenger beetles (which have only 1 row of punctures).

They also have a siphon-like structure which they elongate out of their body and above the water to breathe oxygen from the air.

Wings & Flight

These aquatic insects belong to the order Coleoptera, meaning insects with “sheath-wings.”

This refers to the strong and leathery front wings these insects have called the elytra. These hard wings help protect their softer hindwings in water.

Only adults develop flight wings and can thrive on both land and water.

Eggs are laid on the land (under leaves), and larvae grow up in the water without wings. They pupate near the shore, and finally, adults with wings emerge.

Diving Beetle
Boreal Diving Beetle

Adult beetles can fly long distances in search of new water bodies. Males have wings with shiny surfaces, whereas female wings have grooves running along them.

While swimming underwater, they will surface, holding only their abdomen upto the water’s surface to collect more air under their wings for another dive.


Being great predators, they rely on their superb vision and crushing jaw system. Larvae have simple lens eyes called stemmata, with six on each side of their head.

Adults have a total of 14 compound eyes, with each eye having two overlaid retinas. Despite all these eyes, all beetles simply have a dark and light-based vision comprising tiny dots.

Paddle Like Legs

To adapt to swimming in the water, adult diving beetles’ back legs are paddle-shaped.

These legs are more suited for wading through water than walking on land – giving them an awkward gait on solid ground.

Along with the paddles, their entire body is smooth and streamlined to allow for the least water friction while propelling themselves ahead.

Males also have an adhesive section on their forelegs, which they attach to the back legs of the female beetle during mating.

Diving Beetle

Cleaning Their Surroundings

Diving beetles are great aquarium pets as they help keep them clean.

With a good balance of algae, beetles, and plants, one can even set up a self-cleaning ecosystem in a garden pond.

Overall, they are considered to be top predators in many freshwater ecosystems and play an important role in controlling the population of other organisms.

Because of this, they are a preferred addition to fisheries, where they feast on the smaller fish, which are considered pests, and also get rid of mosquito larvae that can grow in stagnant water. The diving beetle larvae are an even voracious predator.

Frequently Asked Questions

How long can a diving beetle stay underwater?

While there’s not been any specific research on this question, there are a few sources that mention that diving beetles can stay underwater for as long as 36 hours.
It won’t be surprising, considering all the adaptations that they have evolved in order to stay in the water.
This includes the ability to “breathe” underwater, paddle-like feet, and a streamlined body.
They have even evolved special eyesight to tackle underwater viewing. 
In fact, as larvae, they live entirely underwater and only come out once they become adults.

What is the Behaviour of the great diving beetle?

Diving beetles are one of the few species of beetles in the world that can live inside water for long periods of time.
They do so by a special adaptation – they can carry oxygen under their wings when they dive.
In their early years, these beetles are voracious eaters and known for being ferocious regarding the hunt – so much so that they are called “water tigers”.
They can take on and eat much larger organisms than themselves.
When they grow into adults, diving beetles do not lose out on their appetite – they eat everything from small pests to tadpoles to frogs and more.

What are the adaptations of the great diving beetle?

 Some of the key adaptations that help adult great diving beetles include:
Ability to breathe underwater by capturing air under their wings.
Paddle-like feet to help move in the water.
Compound eyes with a specialized vision that lets them see things clearly when in the water 
Cleaning up their surroundings by eating up all the pests and bugs in their water sources.
The ability to fly when on land

How do diving beetles move?

Diving beetles have tiny paddle-like features on their feet, which they use to propel themselves forward in the water.
This is one of the unique adaptations that has helped them live both on land and for a long time in the water. 
Their body is also much more streamlined than other insects. This helps them move along smoothly when in water.
When they are on land, they can both walk and fly. They fly with the help of their hind wings.

Wrap Up

Diving beetles are a great companion addition to garden ponds—hatcheries and freshwater habitats alike.

They do inject a toxin into their prey; however, it is not enough for humans or even smaller pets like cats to show any symptoms.

They’re a very safe pet for aquariums, especially if your kid is interested in studying the life cycle and adaptions of insects.

Thank you for reading!


  • Bugman

    Bugman aka Daniel Marlos has been identifying bugs since 1999. is his passion project and it has helped millions of readers identify the bug that has been bugging them for over two decades. You can reach out to him through our Contact Page.

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  • Piyushi Dhir

    Piyushi is a nature lover, blogger and traveler at heart. She lives in beautiful Canada with her family. Piyushi is an animal lover and loves to write about all creatures.

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6 Comments. Leave new

  • also looks like Hydrophilus triangularis

  • what kind of bug is this…in S. California, Big, Round, Fast flying and fast turns, buzz like a bee when it flys by and very Black. Kinda looks like a bubble bee but faster, bigger and black. They seem to follow me when i’m smoking cig outside. Do they bite or sting?

  • Hello
    I’ve lived in Sacramento, CA for 13 years. Not until a few years ago did I even know what a Giant Water Beetle was. Until one summer night I ran into them hanging out by our apartment pool. Since then I’ve moved into a house and this year they’ve moved into my garage. Wat can I do to drive them out without killing them!?

  • Hello
    I’ve lived in Sacramento, CA for 13 years. Not until a few years ago did I even know what a Giant Water Beetle was. Until one summer night I ran into them hanging out by our apartment pool. Since then I’ve moved into a house and this year they’ve moved into my garage. Wat can I do to drive them out without killing them!?


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