Euastacus sulcatus is a freshwater crayfish

Crayfish

Crayfish, crawfish, or crawdads – members of the superfamilies Astacoidea and Parastacoidea – are freshwater crustaceans resembling small lobsters, to which they are related...

, or yabby

Yabby

Yabby is a name given in Australia to two different kinds of crustacean.* A freshwater yabby is a crayfish of the genus Cherax . They are often caught for food. A widespread species is the common yabby, Cherax destructor.* A marine yabby is a ghost shrimp , which lives in deep burrows in the...

. It is bright blue in colour and roams the forest floor when conditions are damp.

Distribution

E. sulcatus ranged from Mount Tamborine to the Lamington Plateau, southern Queensland

Queensland

Queensland is a state of Australia, occupying the north-eastern section of the mainland continent. It is bordered by the Northern Territory, South Australia and New South Wales to the west, south-west and south respectively. To the east, Queensland is bordered by the Coral Sea and Pacific Ocean...

, and west along the McPherson Range

McPherson Range

The McPherson Range is an extensive mountain range, a spur of the Great Dividing Range, heading in an easterly direction from near Wallangarra to the Pacific Ocean coastline. It forms part of the Scenic Rim on the border between the states of New South Wales and Queensland. Further west of the...

 bordering New South Wales

New South Wales

New South Wales is a state of :Australia, located in the east of the country. It is bordered by Queensland, Victoria and South Australia to the north, south and west respectively. To the east, the state is bordered by the Tasman Sea, which forms part of the Pacific Ocean. New South Wales...

. A relict population may exist on Mount Warning

Mount Warning

Mount Warning is a mountain west-south-west of Murwillumbah, near the border with Queensland in the Northern Rivers region of New South Wales, Australia...

.

Habitat

The species occurs in streams at altitudes above 300 metres (984.3 ft), in rainforest and sclerophyll

Sclerophyll

Sclerophyll is the term for a type of vegetation that has hard leaves and short internodes . The word comes from the Greek sclero and phyllon ....

forest.