It has a red background colour on the dorsum of snout with large, irregular pale white spots.

The venter of first trunk ring with distinct red elongated spots in longitudinal row, almost forming a stripe, on midline present in male.

[1] Stigmatopora harastii is currently known to occur in central New South Wales, Australia, from only three localities, including Botany Bay, Shellharbour, and Jervis BBa.

Stigmatopora harastii inhabits semi-exposed bay entrances and ocean embayments in which the underwater terrain is characterised by sandy areas interspersed with boulders and hard flat reefs.

Individuals and pairs of S. harastii were observed in close association with a species of finger sponge appearing to a member of the family Callyspongiidae and several different species of red algae appearing to be of the family Gracilariaceae in the genera Crassiphycus and Gracilaria.