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Annelida

Annelida. Nadine Thomas, Elizabeth Skuriat, Julia Woynar , and Johanna Murray. Species. Medium sized phylum with more than 16500 species of worms Freshwater, marine, or terrestrial 3 Major Classes of Annelida: Polychaeta Hirudinea Oligochaeta. This specimen is an Oligochaeta .

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Annelida

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  1. Annelida Nadine Thomas, Elizabeth Skuriat, Julia Woynar, and Johanna Murray

  2. Species • Medium sized phylum with more than 16500 species of worms • Freshwater, marine, or terrestrial • 3 Major Classes of Annelida: • Polychaeta • Hirudinea • Oligochaeta This specimen is an Oligochaeta.

  3. Characteristics • Bilaterally symmetrical • Body has three separate sections – prostomium, trunk, and pygidium • Body has more than two cell layers, tissues, and organs • Live in most environments This specimen is a Polychaeta.

  4. Characteristics cont’d • Major invertebrate phylum • Life span – months to years • Size – millimeters to meters • Movement assisted by lobes and bristles • Ability to regenerate

  5. Segmentation • Each organism has segmentation • Allows movement and protection • Other phylum with segmentation include Anthropoda and Chordata • Segmentation in Annelida can be either external or internal • Segments separated by septums • Segments can be used for specialization This specimen is a leech.

  6. Biological Systems • Annelida have a closed circulatory system • Simple diffusion is used for gas exchange • Have a digestive system that passes from mouth to anus • Crop, gizzard, typhosole • Also have a nervous system

  7. Evolution • Evolved from the sea • Oligochaetes developed from polychaete stock • Leeches and oligochaetes have clitellum in common • Evolution relations between marine to freshwater.

  8. References TEXT • http://www.earthlife.net/inverts/annelida.html • http://www.fossilmuseum.net/Tree_of_Life/PhylumAnnelida.htm • http://www.bu.edu/gk12/eric/Annelida.pdf • http://www.biosciweb.net/animal/pdf/annel.pdf • http://www.britannica.com/EBchecked/topic/26308/annelid/31789/Evolution-and-paleontology • http://www.mhhe.com/biosci/genbio/raven6b/graphics/raven06b/other/raven06_45.pdf • http://www.biomedcentral.com/1471-2148/9/189 PICTURES • http://zoologi.snm.ku.dk/english/collections/invertebrates/Collection_databases/Annelida/ • http://www.bio.miami.edu/dana/docs/annelids.html • http://www.biodiversityexplorer.org/mm/annelids/index.htm • http://www.cssforum.com.pk/css-optional-subjects/group-d/zoology/14536-notes-zoology-5.html

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