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

©Anne Hoggett: Tytthosoceros lizardensis about 3 cm long near mangroves in Lizard Island lagoon

©Anne Hoggett: Tytthosoceros lizardensis about 1 cm long near mangroves in Lizard Island lagoon
Kingdom Animalia
Phylum Platyhelminthes
Class Rhabditophora
Order Polycladida
Family Pseudocerotidae
Genus Tytthosoceros
Species Tytthosoceros lizardensis



Distinguishing features

Mottled in shades of dull green with a thin black submarginal band that is intersected with fine, closely-spaced radial white lines.


  • From 1 cm to 3 cm (Length of specimens at Lizard Island)


Similar taxa


©Atlas of Living Australia: Australian distribution

Local abundance

  • Lizard Island: This species is abundant in shallow water near the mangroves at the end of One Tree Coconut Beach in the lagoon, among sparse seagrass Halodule uninervis.

Web resources


References that assist with identification

  • Newman, L.J. and L.R.G. Cannon (2003). Marine flatworms: The world of polyclads CSIRO Publishing, Collingwood, Vic.

Other references

  • Humes, A.G. (1997). Pseudanthessius newmanae, new species (Copepoda: Poecilostomatoida: Pseudanthessiidae) from marine turbellarians in Australia, Memoirs of the Queensland Museum, 42(1): 227-231. LIRS catalog number 704.
  • Newman, L.J. and L.R.G. Cannon (1996). Bulaceros, new genus, and Tytthosoceros, new genus (Platyhelminthes: Polycladida) from the Great Barrier Reef, Australia, and Papua New Guinea, Raffles Bulletin of Zoology, 44(2): 479-492. LIRS catalog number 477.