Why in News?
"Army ant species" refers to a diverse group of approximately 200 nomadic ant species known for their aggressive, coordinated foraging behaviour and lack of permanent nests. They are currently in the news due to the discovery of two new species—Aenictus chittoorensis and Aenictus lankamallensis—in the Eastern Ghats of Andhra Pradesh, India.
About
- New Discoveries (2026): Researchers from Karnataka and Odisha identified two new species of the genus Aenictus in the Sri Venkateswara Wildlife Sanctuary.
- Ecological Significance: These ants are considered keystone predators that regulate arthropod populations and shape forest biodiversity through massive daily consumption of invertebrates.
- Dietary Research (2025): Recent studies on the species Labidus coecus have provided experimental evidence that these ants may be attracted to and consume vertebrate meat (such as beef), expanding their known ecological role beyond preying on invertebrates.
Key Features on Army Ant Species
- Taxonomy: All true army ants belong to the subfamily Dorylinae.
- Nomadic Lifestyle: They do not build permanent nests. Instead, they form bivouacs—temporary structures made entirely of the interlocking bodies of worker ants to protect the queen and brood.
- Raiding Behaviour: They conduct highly synchronized mass raids, often referred to as "legionary behaviour". A single colony can kill up to 100,000 insects in a single day.
- Sensory System: Most species are practically blind and rely heavily on chemical pheromones to communicate and navigate in straight columns.
- Caste System:
- Queen: A single, wingless reproductive female capable of laying 3 to 4 million eggs per month.
- Soldiers: Large ants with oversized heads and sharp mandibles for defense and butchering prey.
- Workers: Smaller sterile females responsible for foraging, caring for the young, and building the bivouac.
- Habitat: Primarily found in tropical and subtropical ecosystems across the Americas, Africa, and Asia.
Download Pdf
