They have got 6 legs and 3 main parts; the head, the thorax and the abdomen. A big part of insects have got wings. The early stage is different form the adults in structure, habit and lives, can include a pupal stage in that those groups to undergo a complete transformation. Fossillized insects of enormous size have been found from the Paleozoic Era. Adult insects move about by walking, flying or sometimes swimming. Some insects communicate with a variety of ways with, other communicate by sounds.

They have 8 legs.Their bodies are divided into 2 main parts: cephalothorax and abdomen.They are animals that usually don´t drink. CIRCULATION AND RESPIRATION They were orginated in the water, they are still acuatics, but they adapted to dry habitats. DIVERSITY There are more than species of arachnids. They are the second biggest group of anthropods, the first are the insects.

The Crustaceans are anthropods. Crustaceans include crabs, lobsters, crayfish, shrimps, krill and barnacles. They are related to insects. The group has an extensive fossil record, reaching back to the Cambrian time. Most crustaceans are aquatic mostly marine. Some have moved to land included some crabs and woodlice. The crustaceans have three major body parts: the head, the thorax and the abdomen.

Altrough their name suggests they have myriad legs, the myriapods ranges for having over 750 legs to having few more than 10 legs. The fossil record of myriapods reaches back into the late Slilurian, although molecular evidence suggests a diversification, in the Cambrian Period, and the fossils from the Cambrian Period exist with resemblance to the myriapods.

IMAGES OF ARTHROPODS

THE END