The museum is currently closed for roof works, reopening on Saturday 8 May 2021. Stay connected with us via social or online at our Museum at Home website. Learn more.

Semaphore Crab

Heloecius cordiformis


Similar shape to Fiddler Crabs but differs by having equal sized, purple claws. Common name refers to characteristic waving display used during courtship and territorial defence. To 25 mm across.


Burrows in mud of sheltered bays and estuaries, mid to upper intertidal zone. Habitats vary from creek banks to saltmarsh. Indigenous, Eastern Australia from Tas., to central Qld.

Queensland Museum's Find out about... is proudly supported by the Thyne Reid Foundation and the Tim Fairfax Family Foundation.