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Thermonectus marmoratus

Thermonectus marmoratus

The Thermonectus marmoratus, also known as the marbled water beetle, is a shiny bug that loves to swim in ponds and lakes. It has a beautiful marbled pattern on its back, making it look special in the water.

Habitat: Freshwater ponds and lakes

Appearance

The Thermonectus marmoratus has a sleek, oval body, typically dark brown to black, adorned with distinctive yellowish or orange marbled patterns across its wing covers. Its streamlined shape and flattened legs are adapted for swift aquatic movement, making it visually distinct from land beetles.

KingdomAnimaliaPhylumArthropodaClassInsectaOrderColeopteraFamilyDytiscidaeGenusThermonectus
Thermonectus marmoratus
camouflaged trait badgecolorful trait badgeinsectivorous trait badgediurnal trait badge
Thermonectus marmoratus

Category

Insects

Rarity

Common

Danger

1/5 · Very low

Snaps

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Interesting facts

Adult beetles can fly surprisingly long distances between ponds to find new homes.

Female marbled diving beetles skillfully lay their eggs inside aquatic plants for safety.

Their larvae are nicknamed "water tigers" because they are such fierce underwater hunters.

They can hang upside down at the surface, using their rear end as a snorkel!

Special abilities

Ability

Underwater Air Tank

Thermonectus marmoratus can breathe underwater by trapping an air bubble under its wing covers that acts like a portable oxygen tank.

Ability

Hydro-Propulsion

Thermonectus marmoratus has powerful, paddle-shaped hind legs that help them propel through water with incredible speed and agility.

Ability

Chemical Defense Shield

Thermonectus marmoratus can release defensive steroids from glands to deter hungry predators when they feel threatened.

Measurements & details

Wingspan
15-20 mm
Size
7-10 mm
Lifespan
180-365 days
Leg Count
6

Diet & Feeding

These beetles are fierce predators, hunting other small creatures in their watery homes.

Age differences: Larvae are also voracious predators, often eating similar or slightly smaller prey.

Primary Foods

  • mosquito larvae
  • tadpoles
  • small fish
  • aquatic worms
  • other insect larvae

Foraging Method

  • Pursuit

Ecological connections

eaten by

Bluegill

Lepomis macrochirus

Hunted by fish in aquatic environments.

eaten by

Mallard

Anas platyrhynchos

A potential food source for various waterfowl.

hunts

Common House Mosquito

Culex pipiens

Preys on mosquito larvae, helping control their numbers.

hunts

Bullfrog

Rana catesbeiana

Adults and larvae hunt tadpoles of various frog species.

Traits

Also known as

Marbled Water Beetle

Collections

Safety

Danger

1/5 · Very low

Be careful near water! Always stay close to an adult when exploring.

Frequently Asked Questions

What is Thermonectus marmoratus's wingspan?

15-20 mm

How big is Thermonectus marmoratus?

7-10 mm

How long does Thermonectus marmoratus live?

180-365 days

What does Thermonectus marmoratus eat?

These beetles are fierce predators, hunting other small creatures in their watery homes.

Where is Thermonectus marmoratus usually found?

Freshwater ponds and lakes

How does Thermonectus marmoratus hunt?

Pursuit

How many legs does Thermonectus marmoratus have?

6

Snap Map

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Where to spot

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