Opistognathus jacksoniensis (Macleay, 1881)
Common in the Solitary Islands Marine Park. Species distribution uncertain but probably east coast of Australia from southern Queensland to at least Sydney.
Frequents sand and rubble areas near reefs, where it can build a burrow lined with rubble and shell material. Feeds on zooplankton which is taken from the water column.
Commonly seen with just the head visible from its burrow, these fishes are shy and retreat tail first when threatened. This species has an elongate body and a large mouth which is used to incubate eggs. Grows to about 20cm.