The spider has jointed appendages.
Which class of organisms have jointed appendages?
Phylum Arthropoda have jointed appendages. The term “arthropod” indicates “jointed legs”. The phylum included invertebrates with an exoskeleton and jointed legs, hence named, Arthropoda.
The development of jointed appendages was a spontaneous evolutionary milestone. Arthropods, a collection that includes spiders, crabs and lobsters, are designated by their jointed legs. Without joints, animals with strong bodies and spines would not have been able to move.