Arthropods
The large group of animals called arthropods includes three main types of organism that are important for the transmission of diseases: insects, arachnids and crustaceans. This section will focus on insects, because they cause major public health problems.
Reproduction/life cycle of insects
Most insects follow one of two main modes of reproduction. Winged insects, such as the housefly, undergo four stages of development: egg, larva, pupa and adult. There may be several larval stages. Wingless insects, such as lice, undergo three stages: egg, larva and adult.
Last modified: Wednesday, 2 July 2014, 2:22 PM