Threespot Humbug (species: Dascyllus trimaculatus) in taxonomy (Lizard Island Field Guide)
Dascyllus trimaculatus
Threespot Humbug

©Anne Hoggett: Young Dascyllus trimaculatus about 5 cm long near anemone Heteractis magnifica at Lizard Island

©Lyle Vail: Adult Dascyllus trimaculatus about 12 cm long at Snake Pit near Lizard Island.

©Anne Hoggett: Juvenile Dascyllus trimaculatus in anemone Stichodactyla mertensii at Cod Hole near Lizard Island
Kingdom Animalia
Phylum Chordata
Class Actinopterygii
Order Perciformes
Family Pomacentridae
Genus Dascyllus
Species Dascyllus trimaculatus



Distinguishing features

Adults are dark grey with darker scale edges. All fins dark except for rear dorsal which is transparent or whitish. Young individuals have a white spot on each side and one on the forehead - these disappear with growth.


  • Up to 14 cm (Length)

Depth range

  • Depth range data is not yet available.



©Atlas of Living Australia: Australian distribution


Juveniles often associate with anemones and anemonefishes and may be in large groups. 

Web resources


References that assist with identification

  • Allen, G., R. Steene, P. Humann and N. Deloach (2003). Reef fish identification: Tropical Pacific New World Publications Inc., Jacksonville, FL, USA.
  • Fautin, D.G. and G.R. Allen (1992). Field guide to anemonefishes and their host sea anemones Western Australian Museum, Perth, WA.

Other references

  • Holbrook, S.J., R.J. Schmitt, V. Messmer, A.J. Brooks, M. Srinivasan, P.L. Munday and G.P. Jones (2015). Reef fishes in biodiversity hotspots are at greatest risk from loss of coral species, PLOS One, doi10.1371/journal.pone.0124054. LIRS catalog number 1915.
  • View all references