Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Suborder: Apocrita
Superfamily: Vespoidea
Family: Formicidae Genus: Formica

Ants are one of the most common ground dwelling insects. Being social insects they are often seen in large numbers working together and form colonies underground. 


Several Australian ants scurrying around. image:R.Conan-Davies

They have been found to be evolved from wasp like creatures (hence the super family of Vespoidea) 110 and 130 million years ago.


A carpenter ant (Camponotus sp). image: Muhammad Mahdi Karim wikipedia

Ants have a typical body plan with distinctive bent antennae and often large gaster (rear) 

The anatomy of a typical worker ant. image: wikipedia