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.
Evolutionarily more ancient, the innate immune system relies on a much smaller number of receptors, called pattern recognition receptors (PRRs). Multicellular animals employ pattern recognition receptors to recognize pathogen-associated molecular patterns (PAMPs) in order to detect pathogens.However, cellular stressors are another causative agent of cell and tissue damage.volutionarily more ancient, the innate immune system relies on a much smaller number of receptors, called pattern recognition receptors (PRRs). Multicellular animals employ pattern recognition receptors to recognize pathogen-associated molecular patterns (PAMPs) in order to detect pathogens.