What is "tettigarctidae"

The Tettigarctidae, also known as the hairy cicadas, are a small relict (mostly extinct) family of primitive cicadas, containing a single genus Tettigarcta, with two extant species, one in southern Australia ( Tettigarcta crinita), and the other in Tasmania ( Tettigarcta tomentosa). Fossil taxa include Paratettigarcta zealandica from New Zealand.