[3] Eurynolambrus australis is commonly found among stones and under rocks in the lower and sub tidal region of the intertidal zone where it can reach depths of up to 80 m.[1][4][5] It is often found in rock pools with coralline turf.

[1] Adults are between 50 – 65 mm in size with a broad triangle-shaped carapace that extends over the leg base.

[6] It feeds mostly on coralline alga, which is thought to cause the bright red pigmentation on its shell.

[1] It also feeds on red and green algae, as well as amphipods, isopods and decapods.

Some divers and amateur observers suggest it is more active at night and may be nocturnal.