Tweet this page Like this page Email this page Share this page Home» Resources » Identification » Animals » Key to Ants of NZ » Key 2 Ant key 2 Gaster with a distinct impression between the first and second segments and sting may be obvious (Fig. a). 27 Gaster uniform in outline (Fig. b) and sting absent. 3 Fig a: Gaster of Amblyopone australis Fig b: Gaster of Linepithema humile