If it turns out that the whale lineage diverged from the lineage leading to hippos after the divergence of the lineage leading to the pigs and other artiodactyls, and if the whales continue to be classified in the order cetacea, then what becomes true of the order artiodactyla?

It becomes paraphyletic

Explanation:

Any community of species given a formally taxonomic title is a taxon (pl. taxa). Broadly, a monophyletic taxon contains an organism community from a common ancestor, while a multifyletic taxon consists of unconnected organisms from more than one forefather.

The broad meaning of fish, for example, is one of those concepts that include mammals including whales, and also sharks, salmon or scaled shrimp, of which ancestral vertebrates are often the common relatives, through which amphibians and reptiles come.

Referencing a group of species as a paraphyletic group means that some biological group members have also been positioned in another group for whatever reason.

when your a dog and you need a bone.   go and eat a rabbit

answer; shared meaning;