- Kingdom: Animalia
- Phylum: Mollusca
- Class: Gastropoda
- Subclass: Heterobranchia
- Order: Anaspidea
- Superfamily: Akeroidea
- Family: Akeridae
- Scientific name: Akera bullata
- Norwegian: -
This sea hare has a bubble-shaped external shell. When disturbed, it is capable of retracting, the otherwise very elongated body, into the shell. The body color is usually brown, often with a bluish tint. The mantel has white blotches, while a striped pattern usually dominates on the head. It can grow to a length of 5-6 cm.
A. bullata may be found burrowed in fine mud or sand or crawling among algae on sheltered locations. Among red algae on shallow water, the body color and pattern works very well as camouflage. Sometimes they can be seen swimming around in big swarms, all tough they are not very good swimmers, burdened as they are by the shell.
This species is known from the coasts of Europe and the Mediterranean.