![]() ![]() In pterygotic insects (those which do have wings), there are several types of metamorphosis. Slight variations in size of parts which are relatively proportioned. ![]() ![]() After the embryonic stage, they only go through small changes such as: They are primarily apterous insects, which means they do not have wings. For example, hexapods in the order Diplura are considered ametabolic, meaning they do not undergo significant morphological change after the nymph stage. Not all insects will metamorphose in the same way. Insects are hexapod invertebrates, meaning they have six legs in their adult stage. Their development requires the shedding of their skin as this outer covering prevents it from developing in size, unlike other animals. They are oviparous animals which means they are born from eggs. They are the animal group which undergoes this change most commonly and, often, the most dramatically. Insects are a metamorphic group par excellence. A study from 2008 showed that butterflies could recall pain stimulus then received in their butterfly form. One aspect we have learned is that butterflies can remember life as a caterpillar. There is still much we do not know about this fascinating type of development. There are different types of metamorphosis in animals, with three main distinctions: complete metamorphosis, partial metamorphosis or no metamorphosis. Birds cannot metamorphose either, but insects, amphibians and fish. This is why there are no mammals which go through metamorphosis. In mammals, moving through adolescence is not a metamorphosis as the development is gradual and the adult organism resembles its juvenile form. It is important to differentiate metamorphosis with other types of growth. Specifically, the hormone released to control the process is known as idothyronine. Metamorphosis is controlled by hormone release in the cells of the body. The animal's body structure is significantly different from how it was in the previous stage. However, unlike other types of development, the change is relatively fast and dramatic. Metamorphosis is a type of animal development from one stage to another. ![]()
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