Polyhedral virusesHelical virusesX Enveloped virusesComplex viruses have a capsid that has polyhedral and helical characteristics, and may have extra structures like protein tails. Bacteriophages are examples.

The description combines polyhedral and helical capsid features and mentions protein tails. Viruses with this combination of structures are called complex viruses; bacteriophages are a common example. Therefore, the correct choice is Complex viruses.

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