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Exploring Annelids: The Diverse World of Ringed Worms

Annelids, also known as ringed worms, derive their name from the French term "annelés," meaning "ringed ones," which traces back to the Latin "anellus," meaning "little ring." With 15,000 to 17,000 modern species, including leeches, sandworms, and earthworms, these fascinating creatures date back to 2 billion years ago in the Precambrian era. Annelids feature a hydrostatic skeleton, a closed circulatory system, and unique reproductive methods. Their average lifespan is seven years, and they possess specialized systems for digestion, respiration, and sensing their environment.

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Exploring Annelids: The Diverse World of Ringed Worms

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  1. Annelidacamicorrea

  2. Reason for the name • Alsocalledringedworms • FromFrenchannelés "ringedones", ultimatelyfromLatinanellus "little ring"

  3. Number of species existing • 15,000 to 17,000 modernspecies • Leeches; Hirudinea • Sandworms; Polychaeta • Earth Worms; Oligochaeta

  4. First Fossil Record • 1st fossils found from 2 billion yrs ago. • Precambrian era

  5. Special Features • Hydrostatic skeleton • Symmetrical animals • Have a digestive and closed circulatory systems • Have legs attached to every segment.

  6. Life Cycle • Lay their eggs in their cocoon that they deposit into the soil. • When adults the reproduce either asexually or sexually depending on the species. • Their average life span is 7 years. ç

  7. Digestive System • Consists of a: • Gizzard (not a very developed brain) • Pharynax (pulls in the food into the esophagus) • Crop • Mouth and Buccal cavity

  8. Respiratory System • Unlike other worms this has the beginnings of lungs which consist of gills. • They diffuse through the skin to obtain oxygen and expel carbon dioxide.

  9. Circulatory System • 5 hearts around the esophagus. • Dorsal blood vessel.

  10. Sensory System • Underdeveloped brain found in the head connected by a ring of nerves. • They usually have: • Eyes • Tentacles • Taste buds

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