How do Triops and Lepidurus differ from filter-feeding branchiopods?

While many branchiopods rely on filter feeding to collect small particles like bacteria using fine hairs called setae, the notostracans Triops and Lepidurus differ by their ability to act as predators.1

Although these tadpole shrimps are capable of collecting small particles, they are not restricted to filter feeding. For example, Lepidurus arcticus has been observed preying on other branchiopods, such as the anostracan Branchinecta paludosa, when they inhabit the same pools. This predatory behavior distinguishes them from many other branchiopods that function primarily as filter feeders throughout their lives.1