Arthropoda
An Arthropod is an invertebrate animal having an exoskeleton, segmented body, and joint appendages.
Arthropods come from a lineage of animals that have a coelom, a membrane-lined cavity between the gut and the body that accommodates the internal organs.
This is the largest and most successful of the animal phyla, with over 1 000 000 species identified to date and an estimated 1 000 000 000 000 000 000 (1 quintillion) individuals alive today. Some scientists estimate that there are over 200 million insects for each single person. That's just insects alone, and doesn't include the countless millions of spiders, crustaceans, millipedes, centipedes, etc that make up the phylum Arthropoda.
Arthropods come from a lineage of animals that have a coelom, a membrane-lined cavity between the gut and the body that accommodates the internal organs.
This is the largest and most successful of the animal phyla, with over 1 000 000 species identified to date and an estimated 1 000 000 000 000 000 000 (1 quintillion) individuals alive today. Some scientists estimate that there are over 200 million insects for each single person. That's just insects alone, and doesn't include the countless millions of spiders, crustaceans, millipedes, centipedes, etc that make up the phylum Arthropoda.