species: Petasometra clarae in Lizard Island Field Guide (Lizard Island Field Guide)
Petasometra clarae

©Anne Hoggett: Petasometra clarae just below reef crest on soft coral
Kingdom Animalia
Phylum Echinodermata
Class Crinoidea
Order Comatulida
Family Colobometridae
Genus Petasometra
Species Petasometra clarae



Distinguishing features

Usually fully exposed although the central disc area is sometimes partially hidden. Usually ten arms. Very slimy when touched. A good ring of cirri, often clinging tenaciously to its perch. Colour is distinctive: light to dark brown, sometimes with white on a few pinnules.


  • Size data has not been obtained.

Depth range

  • Depth range data is not yet available.



©Atlas of Living Australia: Australian distribution

Distribution and habitat preferences

Prefers sites with a good water flow. Often found on a brown soft coral 2 to 3 metres below the reef crest.

Found in most places around the Lizard Island group but never in large numbers.

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.

Other references

  • Vail, L.L. (1987). Reproduction in five species of crinoids at Lizard Island, Great Barrier Reef, Marine Biology, 95: 431-446. LIRS catalog number 222.
  • Vail, L.L. (1988). Reproductive strategies, population structure, and resource partitioning in comatulid crinoids at Lizard Island, Ph.D. thesis, James Cook University, Townsville. LIRS catalog number 282.