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Euopisthobranchia (Clade) ..[Anaspidea] ..Anaspidea (Order) - sea hares ..Cephalaspidea (Order) ..[Pteropoda] ..Pteropoda (Order) - sea butterflies ..Runcinacea (Order) ..[Runcinacea] ..Umbraculida (Order) ..[Cephalaspidea]

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Last updated: 28 Aug 2026