Pasimachus

Pronunciation

How to pronounce Pasimachus: //pæˈsɪməkəs//

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Summary

Pasimachus is a genus of North American beetles in the family Carabidae, recognized for its robust members and predatory lifestyle. It is named possibly after a Dorian cavalry commander, reflecting the genus' characteristics such as large mandibles.

Physical Characteristics

Typically ranges from 21-40 mm in body length; P. depressus is more robust compared to P. elongatus, which tends to be slimmer. The most reliable external feature is the shape of the prosternal process (conical vs roundish).

Identification Tips

To differentiate between P. depressus and P. elongatus, note that P. depressus is usually ≥ 28 mm long and more robust, while P. elongatus is ≤ 26 mm long and has a male metatibia with a tuft of golden hairs in the distal third, which is lacking in male depressus.

Habitat

Typically found in leaf litter within forested areas.

Distribution

North and Central America; most diverse in the southern U.S., with P. elongatus reaching Canada (MB, AB).

Diet

Carnivorous; primarily feeds on caterpillars and other larval insects.

Ecosystem Role

As a carnivorous beetle, it plays a role in controlling pest populations by preying on larvae and other small insects.

Cultural Significance

The etymology of Pasimachus relates to Ancient Greek words suggesting 'all warrior', possibly due to the beetle's aggressive predatory behavior.

Tags

• beetles
• Pasimachus
• Carabidae
• Coleoptera
• predatory beetles