section_path: Invertebrate skeletons
section_name: Invertebrate skeletons
paragraph_text: Invertebrate skeletons
  
  Invertebrates are defined by a lack of vertebral column, and they do not have bone skeletons. Arthropods have exoskeletons and echinoderms have endoskeletons. Some soft-bodied organisms, such as jellyfish and earthworms, have hydrostatic skeletons.