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Phylum Annelida

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  1. Phylum Annelida The polychaetes, worms, and leeches

  2. Annelids are all segmented • Series of repeated ring-like units (segments) • All have a head with a well-developed cerebral ganglion (primitive brain) • Many have eyes with lens and retinas • If an Annelid is cut in pieces, usually only the parts containing the head or tail can regenerate • Segments are divided by partitions called Septa NOAA

  3. Each segment has a pair of excretory organs (nephridia), a ganglion, structures for locomotion, and many also have a set reproductive structures • Annelids also have a closed-circulatory system (blood vessels) • More advanced digestive system with a: • Crop: stores food prior to: • Gizzard: grinds food particles • Intestine: absorb nutrients

  4. Nephridia are cilliated tubes open to the outside for removing wastes • Setae are bristles made of chitin on each segment that gives the worm a grip in the dirt PiotrRotkiewickz

  5. Phylum Annelida • Class Polychaeta: the Polychaetes • Can swim or crawl and some species even build tubes or burrows of mud, sand, or calcium carbonate Karen Osborn of Scripps Oceanography

  6. Phylum Annelida • Class Polychaeta Nick Hobgood

  7. Phylum Annelida • Class Clitellata: Earthworms and Leeches • Only half of known leeches suck blood, the other half eat detritus and small animals www.pbs.org