Annelids

• Parapodium


  Paired, unjointed lateral outgrowth that bear the chaetae
• Oligocheata


  mainly freshwater/terrestrial, no parapodia/jaws, fixed number of body segments, not well-developed head, has chaetae, fixed reproductive organs
• Examples of oligochaeta


  Earthworms, blackworms (Lumbriculidae)
• Polychaeta


  Mainly marine, either mobile errant or sedentary, parapodia, eversible pharynx, number of segments depends on family, distinct head
• Mobile errant polychaeta


  Pelagic burrowing, crawling, mobile tubeworms, brightly coloured predators
• Annelids have coelom with fluid filled cavities between tissues, which allows them to move freely within their bodies.
• sedentary polychaeta


  cilia or mucoid methods of deposit/ suspension feeding
• selective deposit polychaeta


  spionids
• ambush predator polychaeta


  bobbit worms
• suspension feeder polychaeta


  fan worms (sabella)