BI256 Lecture Notes - Lecture 22: Homoptera, Hymenoptera, Instar
Document Summary
Animals mar 3rd /17 hexapoda part 3 - anthropoda iv: chapter 21. Sexes are separate in insects and fertilization is usually internal. Parthenogenesis is common in homoptera (true bugs) and hymenoptera (the membrane winged insects) Sexual attraction: female moths secrete a powerful pheromone to attract males from a great distance, fireflies use flashes of light to detect mates, some insects use sounds, color signal and other courtship behaviours. Various forms of metamorphosis produce degrees of change among different insect groups. Most insects change form after hatching from egg. Each stage between molts is called an instar. Metamorphosis: ametabolous (direct) development silverfish and springtails have young similar to adults except in size and sexual maturation stages are egg juvenile (young) adult. Metamorphosis: hemimetabolous metamorphosis some insects undergo a gradual metamorphosis. Grasshoppers, cicadas, mantis, true bugs, mayflies and dragonflies exhibit this metamorphosis.
