Petasida ephippigera, the Leichhardt's grasshopper, is a relatively large, brightly coloured pyrgomorph species of grasshopper in the monotypic genus Petasida, native to the Top End region of tropical northern Australia.

Pyrgomorphidae is a family of grasshoppers in the order Orthoptera; it is the only family in the superfamily Pyrgomorphoidea. Pyrgomorphidae is found worldwide in tropical and warm temperate regions, but the vast majority of the family's approximately 500 species are from Africa, Asia and Australia. Their name is probably derived from pyrgos meaning "tower": a reference to the form (morph) of the head in the type genus Pyrgomorpha and other genera.