Dytiscus

Pronunciation

How to pronounce Dytiscus: //dɪˈtɪskəs//

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Summary

Dytiscus is a genus of predaceous diving beetles found in freshwater habitats across the Holarctic region. Notably known for their aquatic larvae known as 'water tigers', which are effective predators, the adults are also capable of flight and play an important role in ecosystems as predators of various aquatic invertebrates.

Physical Characteristics

Large water beetles with a robust, rounded shape, measuring 22-40 mm as adults and up to 60 mm as larvae. Males have modified tarsi into suckers for grip during mating. Females can be either smooth or grooved (sulcate) on the elytra.

Identification Tips

Look for the characteristic tarsi suckers in males and the variation in elytra texture in females. Adults are usually attracted to light and can be seen flying during warmer months.

Habitat

Freshwater ponds, pools, streams, rivers, and wetlands, often found among aquatic plants. Some species can inhabit saline ponds.

Distribution

Holarctic; present throughout North America, Europe, Asia, and North Africa.

Diet

Predatory; adults and larvae feed on fish larvae, mosquito larvae, other aquatic invertebrates, and occasionally on tadpoles and salamanders.

Life Cycle

One generation per year; mating occurs in late fall and/or early spring. Eggs hatch in about three weeks; larvae pupate in moist soil and emerge as adults in about a week.

Reproduction

Females lay eggs injected singly into aquatic plant stems; overwinter as adults in permanent waters.

Ecosystem Role

Predators in aquatic ecosystems, helping to control populations of mosquito larvae and other invertebrates.

Collecting Methods

• Netting in water bodies
• Light traps

Preservation Methods

• Drying
• Pinning
• Alcohol preservation

Similar Taxa

• Megadytes

Tags

• Dytiscus
• beetles
• aquatic
• predators
• insects