:Semicassis royana

{{Short description|Species of gastropod}}

{{Speciesbox

| image =

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| genus = Semicassis

| species = royana

| authority = (Iredale, 1914)

| synonyms = Cassidea royana Iredale, 1914

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Semicassis royana is a species of medium-sized predatory sea snail, a marine gastropod mollusc in the family Cassidae, the helmet shells and their allies.