FURTHER PHYLOGENETIC CONSIDERATIONS

FURTHER PHYLOGENETIC CONSIDERATIONS

The arthropods are very successful animals. They have diverse body forms. The lifestyles copepods, crabs, lobsters, crayfish, and barnacles demonstrate adaptive radiation. Few aquatic environments are without some crustaceans.

Phylogeny of Chelicerates: The subphylum Chelicerata is a very important group of animals from an evolutionary point of view, They have lesser numbers of species. But they have more individual than many of the crustacean groups. Their exoskeleton and the evolution of excretory and respiratory systems minimize water loss. These characteristics shown that ancestral members of this subphylum are the ancestor of terrestrial animals. Chelicerates are not the only terrestrial arthropods. In fact, the chelicerates have lesser numbers of species and numbers of individuals than the insects and their relatives.


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