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DescriptionAkera bullata is a sea slug that reaches up to 6 cm in length and bears an external shell coloured white to pale brown. The shell is oval-shaped with a flattened tip and up to 6 whorls. The aperture of the shell is almost as long as the length of the shell itself. The well-developed head is marked anteriorly by an indent to give a tongue-like appearance, and extends into a pair of wide, lateral, flat, tentacular lobes. It bears lateral eyes, lacks an operculum and is coloured with blotched, purplish-brown streaks. The body is pale grey to orange but darker on the outer mantle surface and is marked by white or dark spots. The base of the body bears a very large foot that extends into two large lobed parapodia capable of encasing the dorsal and lateral region of the shell. In some individuals a short, white tentacle extends outwards from the posterior end of the shell.Akera bullata is herbivorous during the summer but feeds on sediment throughout the rest of the year. It is capable of swimming by use of its large, lobed parapodia. When disturbed it may excrete a purple coloured fluid from glands within the mantle. It reproduces throughout April to July.