Acanthomyrmex thailandensis is a species of ant that is polygynous and has colonies of up to 1000 workers. The development rate is medium and the ants vary in size, with the queens measuring 4-6 mm, workers measuring 3-4 mm, and majors measuring 5-8 mm. They are brown-red in color and their nutrition includes food insects, syrup, fruit, vegetables, jelly, and cooked chicken.