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Giant black water beetle

Giant black water beetle

Hydrophilus triangularis

A species of Hydrophilus, Also known as Giant diving scavenger beetle

Hydrophilus triangularis, known generally as the giant black water beetle or giant water scavenger, is a species of water scavenger beetle in the family Hydrophilidae. It is the most common and widespread species of Hydrophilus in North America, being found across the contiguous United States, southern Canada, and Mexico.

General Info About Giant black water beetle
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Attributes of Giant black water beetle
Colors
Black
Habitat
marshy lake; weedy pond; swale; stream; under parking lot light
Adult Food Sources
Algae, plant material, dead animals, aquatic invertebrates
Larva Food Source
Small aquatic insects, tadpoles, larvae of other insects, small aquatic animals
Biting/stinging
Not reported
Allergy-causing
Not reported
Defensive attack
Not reported
Venomous
Not reported
Non-poisonous
Not reported
Borer
Not reported
Pollinator
Not reported
Pest-Eating Predatory
Not reported
Phytophagous
Not reported
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Species Status of Giant black water beetle
Widespread and common
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Distribution Area of Giant black water beetle
North America, United States, southern Canada, Mexico
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Life Cycle of Giant black water beetle
Egg The egg phase is marked by a lack of locomotion, with giant black water beetle exhibiting only slight size increase and a change in color prior to hatching.
Larva In this phase, giant black water beetle undergoes considerable growth. It has a worm-like appearance with mouthparts adapted for chewing. It molts several times, increasing in size but not changing drastically in form.
Pupal The pupal stage is a time of transformation for giant black water beetle. Encased within a pupa, it is immobile, and its body is reorganizing into the adult form. Color and shape changes are significant during this stage.
Adult Emerging from the pupa, the adult giant black water beetle's development is marked by the presence of wings and functional reproductive organs. The body is fully formed and hardened, and the adult is mobile, focusing on reproduction.
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Interesting Facts About Giant black water beetle
Giant black water beetle can remain underwater for extended periods thanks to an air bubble stored under its elytra, acting like a natural scuba tank.
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Scientific Classification of Giant black water beetle
Tips for Finding Giant black water beetle
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Youth Habitat of Giant black water beetle
Freshwater Habitats
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Adult Habitat of Giant black water beetle
Freshwater Habitats
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How Can You Attract Giant black water beetle
For trapping adult giant black water beetle, use bait consisting of decomposing plant matter or carrion, as these are attractive food sources for them.
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What is the Best Weather to Observe Giant black water beetle
Look for giant black water beetle during warm and humid conditions, as they prefer moist environments, especially for breeding purposes.
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How and Where Can You Find Giant black water beetle at Different Life Stages
Egg Giant black water beetle eggs are laid on vegetation near water bodies. Inspect plant stems and leaves for small, clustered eggs, which might be covered by a gelatinous substance.
Larva Giant black water beetle larvae are aquatic and can be found in ponds, slow-moving streams, or other calm freshwater habitats. Use a simple dip net to carefully search through water vegetation and debris.
Pupal Giant black water beetle pupae are also aquatic and typically attach to submerged objects or vegetation. Gently search just below the water's surface around the edges of a pond or stream.
Adult Adult giant black water beetle are strong fliers but return to the water to mate and feed. At night, use a light trap near water bodies to attract and capture them. During the day, manually inspect areas of dense vegetation or floating debris where adults may rest or feed.
Are Giant black water beetle harmful?
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Beneficial Effects of Giant black water beetle
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Decomposers
Decomposers
Stage
Adults
Larvae
Giant black water beetle is an industrious cleaner in aquatic ecosystems. The larvae and adults are known to break down a variety of organic matter, including dead animals, plant remains, and animal feces. This large aquatic beetle is equipped with strong mouthparts made for shredding and consuming decaying matter, recycling nutrients back into the environment and playing a critical role in the food web.
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