Kingdom Animalia Linnaeus, 1758 - animals
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   Phylum Mollusca Linnaeus, 1758 - molluscs
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     Class Gastropoda Cuvier, 1795 - snails and slugs
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       Subclass Opisthobranchia Milne-Edwards, 1848 - opisthobranchs see Order Opisthobranchia Milne-Edwards, 1848
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         Order Nudibranchia Cuvier, 1814 - "true" nudibranchs
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           Genus Rostanga Bergh, 1879
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