what are the characteristics of the phylums
The phylum Arthropoda is the largest animal phylum. It contains all the insects, crabs, lobsters, spiders, and scorpions. It is believed there are more than one million types of insects alone on the planet, with many of them yet undiscovered. General characteristics of arthropods include jointed legs and an exoskeleton.n ancestral chordate is shown in the image below. There are a couple of organisms in this phylum that are invertebrates. One such creature is called the sea squirt. Sea squirts show the four characteristics of all chordates previously described, but they never develop a solid backbone.