clade Euthyneura clade Euopisthobranchia Mariaglaja inornata, also called the inornate headshield slug, is a species of sea slug or headshield slug, a marine opisthobranch gastropod mollusc in the family Aglajidae.

The general body colour is a purplish black, with minute white dots densely scattered over the outer surface of the parapodia and on the sole of the foot.

There is usually a broad white band across the front of the head-shield, and there is a yellow or orange edge to the antero-lateral lobes.

The eyes are situated on the inside edge of the lateral lobes, in a translucent area devoid of black pigment.

[3] Mariaglaja inornata is found in the tropical Western Pacific from Japan to eastern Australia.