Ecitonini

Forel, 1893

army ants

Genus Guides

Labidus(Labidus Army Ants)
Neivamyrmex(Legionary Ants)
Nomamyrmex(Nomamyrmex Army Ants)

Ecitonini is a tribe of within the Dorylinae, comprising highly social, nomadic of tropical forests. Colonies contain hundreds of thousands to over a million that conduct coordinated raids to capture prey. The tribe exhibits a distinctive two-phase colony cycle alternating between nomadic and stationary periods. Soldiers possess enlarged, sickle-shaped specialized for defense and prey handling rather than feeding.

Neivamyrmex pilosus casent0003071 label 1 by April Nobile. Used under a CC BY 4.0 license.

Neivamyrmex swainsonii casent0104748 label 1 by April Nobile. Used under a CC BY 4.0 license.

Pronunciation

How to pronounce Ecitonini: /ɛkɪˈtoʊnɪnaɪ/

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Identification

Distinguished from other tribes by the combination of: pronounced with distinct soldier bearing highly modified, sickle-shaped ; nomadic colony with temporary ; mass raiding behavior in organized columns. The soldier mandibles are diagnostic—uniquely enlarged and curved, functioning for defense and prey manipulation rather than mastication. Similar to other army ant groups but distinguished by specific mandible and Neotropical distribution.

Images

Appearance

exhibit pronounced with distinct . Minor workers are small and numerous, specialized for prey capture and transport. Major workers are larger and also participate in foraging. Soldiers are dramatically enlarged with grotesque, sickle-shaped that are highly modified for grappling and pinching. These mandibles are so large that soldiers cannot use them for feeding themselves. The body is robust and adapted for ground-dwelling .

Habitat

Tropical and subtropical forests including rainforest and lowland dry forest. Colonies occupy temporary nest sites () typically beneath logs, between tree buttress roots, or occasionally in man-made structures. The nomadic lifestyle requires continuously accessible foraging terrain with abundant prey.

Distribution

Neotropical region including Central America (Belize, Rica) and South America. Documented from lowland dry forests to mountain rainforests including the Maya Mountains and Cockscomb range.

Seasonality

Active year-round in tropical climates. Colony cycle alternates between nomadic phases (lasting several weeks) and stationary phases (several weeks, occurring several times annually). Raids occur primarily during daytime in the nomadic phase; foraging intensity decreases during stationary phase.

Diet

. capture and consume thousands of assorted arthropods daily, primarily insects and spiders. Small vertebrates that fail to escape may also be taken. Prey is dismembered and transported to the to feed larvae, attendants, and the .

Life Cycle

Colony cycle alternates between two distinct phases. Nomadic phase: colony relocates regularly, hunt by day and transport food and larvae to new sites as night approaches. Stationary phase: colony remains in one location for several weeks, larvae pupate, and the lays up to 30,000 daily. After and of new workers, colony resumes nomadic phase. Development includes egg, larva, pupa, and stages with complete .

Behavior

Mass raiding in organized columns with thousands of . Workers use stinging and biting to subdue prey. Foraging direction changes approximately 123 degrees clockwise between successive raids during stationary phase, preventing re-hunting of the same area. are constructed as living structures with thousands of workers linked leg-to-leg to protect the and . Trail- coordinate movement between bivouacs and food sources.

Ecological Role

Apex in tropical , capable of consuming thousands of prey items daily. Regulates arthropod through intensive . Creates foraging opportunities for associated myrmecophiles including clown beetles (Haeteriinae) that infiltrate colonies. Colony movements may influence local arthropod composition and distribution.

Human Relevance

Soldier have been demonstrated capable of compressing skin sufficiently to act as wound , a practice reportedly used historically by Mayan peoples. Colonies occasionally establish in human structures such as outhouses, creating unexpected encounters. Serve as subjects of significant ecological research regarding collective intelligence and swarm .

Similar Taxa

Atta (leafcutter ants)Both are highly social Neotropical ants with extreme and large colony sizes, but Atta are herbivorous fungus-farmers with adapted for cutting vegetation rather than , and they occupy permanent subterranean nests rather than nomadic .
Other Dorylinae army ants (Aenictus, Dorylus)Share nomadic lifestyle and mass raiding , but differ in distribution (Aenictus Old World, Dorylus African/Asian) and specific of soldiers.

More Details

Myrmecophile associations

Ecitonini colonies specialized myrmecophiles including clown beetles (Haeteriinae) that have evolved chemical mimicry and behavioral adaptations to infiltrate colonies.

Foraging pattern research

Nigel Franks documented that during stationary phase, successive foraging bouts rotate approximately 123 degrees clockwise, enabling systematic coverage of without overlap.