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You are watching: What is the largest phylum of animals


Arthropoda is the largest phylum that invertebrates. But an ext than that, the is the biggest phylum in the entire animal kingdom. 

According to the Encyclopedia Britannica, about 84% that all recognized animal species are arthropods, a group identified by a jointed exoskeleton of chitin -- armor make from a complex...

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Arthropoda is the largest phylum that invertebrates. But an ext than that, that is the biggest phylum in the entire pet kingdom. 

According come the Encyclopedia Britannica, around 84% that all well-known animal varieties are arthropods, a group distinguished by a jointed exoskeleton the chitin -- armor made from a complicated sugar that is excreted by the epidermis.

The simple body plan is modular. Typically, most body segment bear a pair that appendages, and the human body segments are grouped into three duty units: The head, the thorax, and also the abdomen.

Arthropods share some features with vertebrates, favor bilateral symmetry. However they likewise differ in countless ways. Because that example, they possess an open up circulatory system, in i beg your pardon blood flows freely within the body cavity, fairly than v blood vessels.

The phylum Arthropoda is currently divided into four subphyla:

Myriapoda (including centipedes and millipedes)Chelicerata (including spiders, scorpions, ticks, and mites)Crustacea, (including crabs, crayfish, lobsters, shrimp, krill, barnacles, and woodlice)Hexopoda, (including insects, springtails, and also other, insect-like relatives)

To date, most arthropod types identified by science are insects. Researchers have described around one million species so far, and also some calculation that there may be as many as ten million insect varieties total. Thus, the total number of anthropod species must exceed this number.

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Over all, arthropods space a very diverse and also successful group. They have actually been uncovered in virtually every habitat, including marine and also terrestrial ones. Some arthropods varieties have adjusted to the extreme conditions of Antarctica. Others survive in the Namib desert.