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The metamorphosis is a process used by certain arthropods, amphibians, molluscs, cnidarian, echinoderm, tunicates and the development of the juvenile stage in the larva in its adult stage. The larva can look like the miniature versions of adults, or a totally different aspect, but in the majority of cases is essentially physiological, including special bodies. One of the most popular conceptions of metamorphosis is the transformation of a caterpillar into butterfly. This has been culturally as a metaphor for the transformation and rebirth, seen the appearance of a beautiful Butterfly in an ugly Caterpillar. Before getting involved in the metamorphosis, the Caterpillar is wrapped in a sheath known as a cocoon. Buds may have commercial value the cocoons of silk worms, for example, they are used to make silk. The exact reproduction of the silk still has not been developed in laboratories.

A metamorphosis can permanently change the capabilities of the Agency. For example, the tadpoles, the larval forms of amphibians, are purely aquatic, but once metamorphosis occurs, converted to salamanders, newts, frogs or toads, and increasing the capacity of transported by soil occurs. Toads, are a type of frog adapted itself, can spend hours on Earth without exposure to water, and survive only in burrow in the ground moisture. Sometimes the difference between the larva and the adult form is so extreme and fundamental in all its characteristics, such as notocord (a kind of primitive vertebral column) in the larval stage, does not occur with adults, as in the case of tunicates. It is believed that the vertebrate evolucionaron of the larval form of fixed animals such as tunicates. In a sample of a phenomenon known as neotony. All insects go through a metamorphosis. There are two types of fundamental metamorphosis: incomplete metamorphosis and complete metamorphosis.

In the case of incomplete metamorphosis, in the State (stage shedding an exoskeleton) only change slightly, and the Agency never enters a closed cocoon, also known as pupa. In a complete metamorphosis, the whole insect is enclosed in a pupa, and changes your body shape considerably. An example would be a worm transformed into a fly. There are many other examples of metamorphosis within nature. The phenomenon of metamorphosis was apparently lost after amphibians, rather than be replaced by further growth within the uterus.