Pseudoceros dimidiatus

Tiger Flatworm | Divided Flatworm
Pseudoceros dimidiatus
Pseudoceros dimidiatus, Raja Ampat, Indonesia, Photo: Andrew Green
Pseudoceros dimidiatus
Pseudoceros dimidiatus, Coral Sea, Australia, Photo: Ian Shaw
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Pseudoceros dimidiatus
Pseudoceros dimidiatus


Tropical Indo-Pacific


Elongated oval body. Variable colouration but all include a black body with an orange margin. Varying amounts of yellow-green stripes and blotches, commonly two wide yellow-green stripes separated by a central black median line of variable width. Coral reefs, grows to 80 mm.


Max Size: 8 cm

Sea Temperature Range: 26.6-29.4°C

Depth: N/A

Habitat Generalization Index: N/A

Also referred to as the SGI (Species Generalisation Index), this describes the habitat niche breadth of the species. Species with values less than 15 are found in a relatively narrow range of reef habitat types (specialists), while those over 25 may be found on most hard substrates within their range (generalists). Learn more here.

Conservation and Rarity

IUCN Status: Not Evaluated

Occurrence: Rare (0.9% of sites)

Occurrence describes how often the species is found on surveys within its distribution. It is calculated as the % of reef sites surveyed by RLS divers across all the ecoregions in which the species has been observed

Abundance: Solitary (1 per transect)

Abundance is calculated as the average number of individuals recorded per RLS transect, where present.