Naxia tumida

{{Short description|Species of crab}}

{{For|other crabs also known as 'decorator crabs'|Decorator crab}}

{{Use dmy dates|date=February 2021}}

{{Speciesbox

| taxon = Naxia tumida

| authority = (Dana, 1852)

| synonyms = Halimus tumidus Dana, 1852

}}

Naxia tumida, the little seaweed crab, dresser crab, or decorator crab, is a small crab of the family Majidae (with a carapace up to {{convert|4|cm|disp=or}} in diameter) that is common in rocky intertidal and subtidal areas on the temperate coasts of Australia, including parts of Victoria, New South Wales, Tasmania, South Australia and Western Australia.{{cite web |url=http://australianmuseum.net.au/Decorator-Crab |publisher=Australian Museum |title=Naxia tumida |date=5 January 2010 |accessdate=29 March 2011}} It is usually found covered in seaweed that acts as camouflage, attached to the hooks on its shell. It attaches the algae or seaweed with a secretion that becomes adhesive when hardened.

Naxia tumida was discovered by the United States Exploring Expedition and described by James Dwight Dana, originally under the name Halimus tumidus. The syntypes appear to have been lost.{{cite web |url=http://www.environment.gov.au/biodiversity/abrs/online-resources/fauna/afd/taxa/Naxia_tumida |title=Species Naxia tumida (Dana, 1852) |work=Australian Faunal Directory |publisher=Department of the Environment, Water, Heritage and the Arts |date=9 October 2008 |accessdate=29 March 2011}}