Hypselodoris sp. B Genus: Stimpson, 1855
Hydatina physis is quite variable in its colour shading. It can range from a very dark form to a pale pinkish white in which the bluish border is almost invisible. It has thin brown lines running across the translucent white shell. Hydatina physis feeds exclusively on cirratulinid polychaete worms.
Class: GASTROPODA
Subclass: OPISTHOBRANCHIA
Order: CEPHALASPIDEA
Superfamily: ACTEONOIDEA
Family: Hydatinidae Pilsbry, 1893
Genus: Hydatina Schumacher, 1817
Hydatina physis (Linnaeus, 1758) [Bulla]
Hydatina zonata (Solander in Lightfoot, 1786) [Bulla]
Genus: Micromelo Pilsbry, 1895
Micromelo undata (Bruguière, 1792) [Bulla]
Superfamily: BULLOIDEA
Family: Bullidae Lamarck, 1801
Genus: Bulla Linnaeus, 1758
Bulla ampulla Linnaeus, 1758
Superfamily: DIAPHANOIDEA
Family: Diaphanidae Odhner, 1914
Genus: Colpodaspis Sars, M., 1870
Colpodaspis thompsoni Brown, 1979
Superfamily: HAMINOIDEA
Family: Haminoeidae Pilsbry, 1895
Genus: Atys Montfort, 1810
Atys cylindrica (Helbling, 1779) [Bulla]
Atys naucum (Linnaeus, 1758) [Bulla]
Genus: Haminoea Turton & Kingston, 1830
Haminoea cymbalum (Quoy & Gaimard, 1833) [Bulla]
Haminoea ovalis Pease, 1868
Genus: Liloa Pilsbry, 1921
Liloa sp. A Genus: Pilsbry, 1921
Superfamily: PHILINOIDEA
Family: Aglajidae Pilsbry, 1895 (1847)