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The Red Rostanga (Rostanga arbutus) is a small nudibranch species that is confined to the shallow waters of the New South Wales coast in eastern Australia. It was previously thought that species was distributed through the waters of the Indo-western Pacific region and Australia but is now considered to be endemic to New South Wales. This species can be found from the intertidal zone down to approximately 5 metres depth and can be found crawling over rocks and algae; its small size and shape makes it easily mistaken for a small patch. The body of this species is red/orange in colour and the mantle is covered in colourless translucent caryophyllidia. It is known to feed on the sponge Clathria aceratoobtusa. The Red Rostanga (Rostanga arbutus) is generally small in size (less than 3cm) however it has been recorded up to 5cm in length.
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