Three-pronged Sea Spider
Halicarcinus ovatus
© 2026 MarineWise
Quick Facts
Scientific nameHalicarcinus ovatus
Other namesThree-pronged Flat Spider Crab
SizeUp to 2 cm (.78 in) Carapace
WeightA few grams
FamilyCrustaceans / Hymenosomatidae
Distribution
Habitat & AU DistributionCoastal waters amongst muddy areas of shallow reef rich in algae & seagrass
Depth Range0 - 85 m (278 ft)
