GREYIAN Iredale & Whitley 1938

Although Iredale & Whitley’s (1938) map mostly delimits the region as diagnosed above, the description is misleading in noting that the “Nannatherinidae” (based on Nannatherina balstoni Regan 1906, and currently classified in the Austral family Percichthyidae) is a remarkable component of the fauna, when the taxon is actually endemic to their Vlaminghian Fluvifaunula. The southern boundary with the Vlaminghian Region was not clearly depicted or described by Iredale & Whitley, though Whitley (1959) gave it as “south of Shark Bay.” Our choice of the Greenrough River as the southern limit follows Morgan & Gill (2004), who recognised three sub-areas within the Pilbara. As noted above, Iredale (1943) included the Kimberleys within the Greyian Fluvifaunula.