Arthropoda. :P
They are arthropods, phylum Arthropoda.
All arthropods by definition belong to phylum Arthropoda.
The phylum arthropoda takes its name from the Greek for "jointed foot" or jointed leg; arthropods are characterized by their jointed appendages.
Some animals in phylum arthropods is a spider, centipedes or crabs.
All insects are in the phylum of Arthropods.
"Arthropods"
arthropods
No. Arthropods are members of the phylum Arthropoda; but hydrae are members of the phylum Cnidaria. The closest to a "common" term for animals in this phylum that exists is "cnidarians".
The opposite of arthropods would be non-arthropods or invertebrates that do not belong to the phylum Arthropoda.
The largest phylum in the animal kingdom is Arthropoda, which includes insects, spiders, crustaceans, and other related organisms. It is estimated that over 80% of described animal species belong to this phylum.
Arthropods.
Arthropods