Invertebrate
Lamington Spiny Crayfish
Euastacus sulcatusAlso known as Lamington Crayfish, Blue Mountain Crayfish
Lamington spiny crayfish dwell in the cool, elevated rainforest streams of southern Queensland and northern New South Wales. While famous for their vivid sky-blue carapaces, individuals can also sport brilliant orange, bright red, or dark brown hues depending on their local creek catchment. During wet weather, these robust freshwater crustaceans venture onto the damp forest floor to forage, establish new territories, and seek out mates.
CrustaceanColorfulRainforest
—observations
—countries
—peak records
VulnerableConservation statusIUCN Red List categoriesLCNTVUENCREWEXVulnerableRed List categories, explained →
Diet & preyLeaf Litter, Aquatic Insects, Fungi
Predators
- Feral Cat
- Red Fox
- Short-finned Eel
ThreatsClimate change, elevated water temperatures, feral predators, and illegal poaching
HabitatsSubtropical rainforest creeks, headwater streams, and damp forest floors
Life span20–30 years
Classification
- FamilyParastacidae
- SpeciesEuastacus sulcatus
Range data is not available yet.
Interaction riskLow
- Low
- Moderate
- High
- Very high
- Why interaction risk is low
- Capable of giving a painful pinch with its large claws; observe without handling or touching.
- What to notice
- Recognized by its spiny carapace, robust claws, and striking blue, red, or white coloration in montane rainforest streams.
- Support conservation
- Observe quietly from marked trail edges, never disturb stream beds, and leave all wild individuals in their natural habitat.
Responsible observation
- Watch During Rain: Look along rainforest trails and damp creek banks after heavy downpours when they emerge to forage.
- Maintain Distance: Leave them undisturbed to avoid defensive pinching and protect fragile stream habitats.
- Keep Hands Off: Strict laws protect this threatened species, making it illegal to touch, capture, or remove them.
Image unavailableClose Relative 
Same Family Kiri Bee / CC BY 4.0 · cc-by
Close Relative (c) Sockrosma, some rights reserved (CC BY) · cc-by
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