Skin coloration may vary from off-white to cream to light green, overlain with irregular blotches of brown or brick-red speckles (Government of Western Australia 2010).
A closely related species, the Southern Sandhill frog, Arenophryne xiphorhyncha, was earlier thought to be identical to A. rotunda; however, more detailed analysis reveals this closely related species residing in the Kalbarri dunes, is a distinct taxon. These two taxa apparently genetically diverged approximately five to seven million years before present.
There are a number of faunal associates in this coastal zone of the Southwest Australian savanna (Hogan and World Wildlife Fund 2012). Notable avifauna include the Near Threatened blue-billed duck (Oxyura australis), the Vulnerable fairy tern (Sterna nereis), and the Vulnerable fat eastern curlew (Numenius madagascariensis).
Notable reptile associates include a swimming skink, the Vulnerable Shark Bay ctenotus (Ctenotus zastictus), which is also found on the dunes of Shark Bay; and the Christina's lerista (Lerista christinae), a species also endemic to the coastal zone of the Southwestern Australian savanna; and the Endangered woma (Aspidites ramsayi).
Notable mammals with overlap or near overlap of range include the Near Threatened black-footed rock wallaby (Petrogale lateralis), although the limits of this wallaby's distribution have shrunk due to its recent population decline.