Triops is a genus of small crustaceans in the order Notostraca (tadpole shrimp). Some species are considered living fossils, with a fossil record that reaches back to the late Carboniferous, 300 million years ago. One species, Triops longicaudatus, is commonly sold in kits as a pet.
Innate immunity is found in both animals with and without adaptive immunity. The molecular components of the innate immune system do not appear to be closely related to the molecules of the adaptive system.
These non-specific barriers are extremely important, but they represent just the first line of defense. The innate and adaptive immune systems provide additional important barriers to infection. These non-specific barriers are extremely important, but they represent just the first line of defense. The innate and adaptive immune systems provide additional important barriers to infection.