Final answer:
A virus name ending in "viridae" refers to the Family level in the ICTV taxonomy system.
Step-by-step explanation:
In the ICTV taxonomy system, a virus name ending in "viridae" would be part of a Family grouping. The ICTV classifies known viruses into orders, families, and genera based on their characteristics such as genetics, chemistry, morphology, and replication mechanisms. In this system, family names end with "-viridae" (e.g., Parvoviridae), while genus names end with "-virus" (e.g., Parvovirus). Therefore, when you see a virus name ending in "viridae," you can be confident that it refers to the Family level in the ICTV classification system.