species: Arachnanthus sp. in Lizard Island Field Guide (Lizard Island Field Guide)
Arachnanthus sp.

©Anne Hoggett: Arachnanthus sp. at Watson's Bay, Lizard Island, off Chinaman's Ridge, 16 metres depth, at night. Diameter of oral disc is about 1 cm, longest tentacles about 7 cm long.
Kingdom Animalia
Phylum Cnidaria
Class Ceriantharia
Order Penicillaria
Family Arachnactidae
Genus Arachnanthus
Species Arachnanthus sp.



Distinguishing features

Large size, low tentacle count (for a cerianthid), the long tentacles are very much longer than the inner ring of shorter tentacles, dark colouration.

Thanks to Joe Rowlett (Field Museum, Chicago) for identifying the Watson's Bay image as Arachnanthus sarsi. The type locality for that species seems to be the North Atlantic and Atlas of Living Australia (accessed 11 Jan 2020) does not have any records of it in Australia so the species name is not applied here.


  • Size data has not been obtained.



Web resources


  • Stampar, J.D. Reimer, M.M. Maronna, C.S.S. Lopes, H. Ceriello, T.B. Santos, F.H. Acuña and A.C. Morandini, S.N. (2020). Ceriantharia (Cnidaria) of the World: an annotated catalogue and key to species. ZooKeys, 952: 1-63. LIRS catalog number 90381.