Big-headed Tiger Beetles

Pronunciation

How to pronounce Megacephalini: //ˌmɛɡəˌsɛfəˈlaɪnaɪ//

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Summary

Megacephalini is a tribe of big-headed tiger beetles characterized by their predatory behavior and distinctive morphology. With several genera and species, they are ecologically important insects found primarily in open habitats.

Physical Characteristics

Tribe Megacephalini contains beetles with a notable 'big-headed' appearance. The metallic forms, especially in the genus Tetracha, display a shiny finish, while other genera have darker pigmentation, primarily brown or black.

Identification Tips

Look for large eyes and distinctive head shapes. The separation of hind coxae and antenna color (pale vs. dark) can help differentiate between the genera.

Habitat

Widespread across various habitats, including sandy and loose soil regions, often near water bodies or in open areas.

Distribution

Found primarily in the Americas (including both North and South America), Palaearctic, Australian, and Afrotropical regions.

Diet

Predatory, primarily feeding on other insects.

Life Cycle

Typical life cycle includes egg, larval, pupal, and adult stages, with larvae often being predatory.

Reproduction

Eggs are laid in sandy or loose soil, where the larvae will later develop.

Ecosystem Role

As predators, they play a critical role in controlling insect populations in their environments.

Collecting Methods

• Pitfall traps
• Hand collecting
• Sweep nets

Preservation Methods

• Ethanol
• Freeze-drying
• Pinning

Evolution

Part of the Cicindelidae family, showing diverse adaptations across different genera and environments.

Similar Taxa

• Cicindela
• Amblycheila
• Tetracha

Misconceptions

The term 'big-headed' may mislead as it could imply they are harmful or aggressive, whereas they are beneficial predators.

Tags

• beetles
• insects
• predators
• Cicindelidae
• Megacephalini