Order Cephalaspidea
Order Cephalaspidea (3+ suborders, 3+ families, 5+ genera)
- Suborder Atyacea (1+ families, 2+ genera)
- Family Atyidae
- Genus Atys
- Genus Haminoea
- Suborder Bullacea (1+ families, 1 genus, 4+ species)
- Family Bullidae (1 genus, 4+ species)
- Genus Bulla (4+ species)
- Bulla ampulla
- Bulla botanica
Australian Bubble
- Bulla gouldiana
- Bulla striata
Common Atlantic Bubble
- Suborder Acteonacea (1+ families, 2+ genera)
- Family Hydatinidae (2+ genera)
- Genus Hydatina
- Genus Nicromelo
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