# 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. - **Category:** [Insects](https://www.snappit.app/explore/categories/insect) - **Rarity:** Common - **Danger:** 1/5 · Very low - **Snaps:** 2 - **Habitat:** Freshwater ponds and lakes - **Also known as:** Marbled Water Beetle ![Thermonectus marmoratus](https://commons.wikimedia.org/w/index.php?title=Special:Redirect/file/Sunburst_Diving_Beetle_049.jpg&width=800) Photo: Ltshears, CC BY-SA 3.0 · [Wikimedia Commons](https://commons.wikimedia.org/wiki/File:Sunburst_Diving_Beetle_049.jpg) ## 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. ## Taxonomy - **Kingdom:** Animalia - **Phylum:** Arthropoda - **Class:** Insecta - **Order:** Coleoptera - **Family:** Dytiscidae - **Genus:** Thermonectus ## 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 - **Underwater Air Tank:** Thermonectus marmoratus can breathe underwater by trapping an air bubble under its wing covers that acts like a portable oxygen tank. - **Hydro-Propulsion:** Thermonectus marmoratus has powerful, paddle-shaped hind legs that help them propel through water with incredible speed and agility. - **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](https://www.snappit.app/explore/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 - [Camouflaged](https://www.snappit.app/explore/traits/camouflaged): Camouflaged describes organisms that possess coloring or patterns that allow them to blend into their environment. - [Colorful](https://www.snappit.app/explore/traits/colorful): Colorful describes organisms or objects displaying a wide range of bright and distinct colors. - [Insectivorous](https://www.snappit.app/explore/traits/insectivorous): This trait identifies organisms whose diet primarily consists of insects and other small invertebrates. - [Diurnal](https://www.snappit.app/explore/traits/diurnal): Diurnal animals are primarily active during daylight hours, typically resting or sleeping at night. - [Freshwater](https://www.snappit.app/explore/traits/freshwater): Freshwater habitats include non-saline aquatic environments such as rivers, lakes, ponds, and wetlands, vital for numerous species. - [Keystone Species](https://www.snappit.app/explore/traits/keystone-species): Describes a species whose presence and role have a disproportionately large effect on its environment. - [Speedster](https://www.snappit.app/explore/traits/speedster): This trait identifies organisms that exhibit exceptional swiftness in movement for hunting, escape, or travel. - [Aquatic](https://www.snappit.app/explore/traits/aquatic): Aquatic habitats encompass environments where organisms live predominantly in water, including oceans, rivers, lakes, and wetlands. - [Pollinator](https://www.snappit.app/explore/traits/pollinator): Describes organisms that transfer pollen, enabling the fertilization and reproduction of plants. ## Collections - [Insects](https://www.snappit.app/explore/collections/insects) ## Safety **Danger:** 1/5 · Very low Be careful near water! Always stay close to an adult when exploring. ## Frequently Asked Questions ### How to identify Thermonectus marmoratus? Look for hard wing covers meeting in a line down the back, then compare the antennae, body shape, legs and markings. Metallic colors shift a lot with lighting. Beetle Identifier: upload a photo and compare the visible details. ### 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 ## Where to spot - [Sabino Canyon](https://www.snappit.app/guides/places/sabino-canyon) — Arizona, US · Natural Landmark ## More Insects - [Common Eastern Bumble Bee](https://www.snappit.app/explore/common-eastern-bumble-bee) (*Bombus impatiens*) - [Spotted Lanternfly](https://www.snappit.app/explore/spotted-lanternfly) (*Lycorma delicatula*) - [Brown-belted Bumble Bee](https://www.snappit.app/explore/brown-belted-bumble-bee) (*Bombus griseocollis*) - [Eastern Carpenter Bee](https://www.snappit.app/explore/eastern-carpenter-bee) (*Xylocopa virginica*) --- Source: [Thermonectus marmoratus: Facts & Places to See — Snappit](https://www.snappit.app/explore/thermonectus-marmoratus)