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Additionally, these insects tend to be relatively large, long-lived, active, and frequently aggregate. [2] Indeed, longer-lived insects are more likely to be chemically defended than short lived ones, as longevity increases apparency. [9] Throughout the arthropod and insect realm, however, chemical defenses are quite unevenly distributed.
Pyrrolizidine alkaloid sequestration by insects is a strategy to facilitate defense and mating. Various species of insects have been known to use molecular compounds from plants for their own defense and even as their pheromones or precursors to their pheromones.
Bombardier beetles are ground beetles (Carabidae) in the tribes Brachinini, Paussini, Ozaenini, or Metriini—more than 500 species altogether—which are most notable for the defense mechanism that gives them their name: when disturbed, they eject a hot noxious chemical spray from the tip of the abdomen with a popping sound.
Insects accordingly employ multiple defensive strategies, including camouflage, mimicry, toxicity and active defense. [138] Many insects rely on camouflage to avoid being noticed by their predators or prey. [139] It is common among leaf beetles and weevils that feed on wood or vegetation. [138] Stick insects mimic the forms of sticks and leaves ...
This potential, however, can hinge on a number of the insect's traits. For example, hemipteran predators can use their sucking mouthparts to make use of leaves, stems, and fruits, but spiders with chelicerae cannot. [17] Still, insects widely considered to be purely carnivorous have been observed to diverge from expected feeding behavior. [18]
Dasyscolia ciliata on the flowers of Ophrys speculum. An allomone (from Ancient Greek ἄλλος allos "other" and pheromone) is a type of semiochemical produced and released by an individual of one species that affects the behaviour of a member of another species to the benefit of the originator but not the receiver. [1]
The Imd pathway is a broadly-conserved NF-κB immune signalling pathway of insects and some arthropods [1] that regulates a potent antibacterial defence response. The pathway is named after the discovery of a mutation causing severe immune deficiency (the gene was named "Imd" for "immune deficiency").
The forelegs are reduced in the Nymphalidae Diagram of an insect leg. The thorax, which develops from segments 2, 3, and 4 of the larva, consists of three invisibly divided segments, namely prothorax, metathorax, and mesothorax. [11] The organs of insect locomotion – the legs and wings – are borne on the thorax.