species: Diadema setosum in ALA: LIRS and surrounds using records to Oct. 2021 (Lizard Island Field Guide)
Diadema setosum

©Anne Hoggett: Poor photo of Diadema setosum at lagoon bommie, Lizard Island in a Porites coral. Enlarge the image to see the orange ring around the anus.
Kingdom Animalia
Phylum Echinodermata
Class Echinoidea
Order Diadematoida
Family Diadematidae
Genus Diadema
Species Diadema setosum



Distinguishing features

Black with very long needle-like spines. A red or orange ring around the anus.


  • Up to 8 cm (test diameter)
  • Up to 30 cm (spine length)

Depth range

  • Depth range data is not yet available.


Similar taxa


©Atlas of Living Australia: Australian distribution

Local abundance


Nocturnal, well-hidden during the day.

Web resources


References that assist with identification

  • Clark, A.M. and F.W.E. Rowe (1971). Monograph of shallow-water Indo-west Pacific echinoderms British Museum (Natural History), London.
  • Miskelly, A. (2002). Sea Urchins of Australia and the Indo-Pacific 180 pp. Capricornia Publications, Sydney, Australia.

Other references

  • Mirams, A.G.K., E.A. Treml, J.L. Shields, L. Liggins and C. Riginos (2011). Vicariance and dispersal across an intermittent barrier: population genetic structure of marine animals across the Torres Strait land bridge. Coral Reefs, 30: 937-949. LIRS catalog number 1482.
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