species: Rhodactis inchoata in Lizard Island Field Guide (Lizard Island Field Guide)
Rhodactis inchoata

©Anne Hoggett: Rhodactis inchoata on NE side of Lizard Island, reef slope, dimensions about 4 x 2.5 cm (16 Jan 2016). Thanks to Joe Rowlett for the tentative species id.

©Anne Hoggett: Detail of Rhodactis inchoata at Lizard Island (16 Jan 2016)

©Anne Hoggett: Side view of Rhodactis inchoata at Lizard Island (16 Jan 2016). The oral disc is strongly attached to the substrate right up to the edge.
Kingdom Animalia
Phylum Cnidaria
Class Hexacorallia
Order Corallimorpharia
Family Discosomidae
Genus Rhodactis
Species Rhodactis inchoata



Distinguishing features

A flat or evenly-fluted, round to oval-shaped oral disc that is quite thick and adheres strongly to the substrate all the way to the edges. Tentacles vary from bushy to broad and flat and extend all the way to the disc edge where there is a distinct ring of short marginal tentacles.


  • Size data has not been obtained.



Local abundance

  • Lizard Island, Queensland: This species is small and easily overlooked so it may be more common than its low number of records in LIFG suggests.

Web resources


References that assist with identification

  • Rowlett, J. (2020). Indo-Pacific Corals. 807 pp. Joe Rowlett, Chicago, USA. ISBN: 9798686565975. LIRS catalog number 90393.