In members of this genus unlike all other Nereididae the antennae are absent and the palps are conical and lack palpostyles. The maxillary ring of the pharynx is not divided into discrete Areas. The dorsal notopodial ligule is absent throughout and the dorsal cirrus is present on an enlarged cirrophore. This species can be distinguished easily using the generic characters - Micronereis halei is the only member of this genus occurring in southern Australia. Body up to about 1 cm long.
Micronereis halei is a minute species that is only known from a few specimens. Only a single specimen has been collected in Port Phillip Bay, despite a vast amount of sampling there.
- DSE Advisory List : Not listed
- EPBC Act 1999 : Not listed
- IUCN Red List : Not listed