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

Annelida

AnnelidaNadine Thomas, Elizabeth Skuriat, Julia Woynar, and Johanna Murray

+SpeciesMedium sized phylum with more than 16500 species of wormsFreshwater, marine, or terrestrial3 Major Classes of Annelida:PolychaetaHirudineaOligochaeta

This specimen is an Oligochaeta.

+CharacteristicsBilaterally symmetricalBody has three separate sections prostomium, trunk, and pygidiumBody has more than two cell layers, tissues, and organsLive in most environments

This specimen is a Polychaeta.

+ploychaeta3Characteristics contdMajor invertebrate phylumLife span months to yearsSize millimeters to metersMovement assisted by lobes and bristlesAbility to regenerate

+SegmentationEach organism has segmentationAllows movement and protectionOther phylum with segmentation include Anthropoda and ChordataSegmentation in Annelida can be either external or internalSegments separated by septumsSegments can be used for specialization

This specimen is a leech.

+Biological SystemsAnnelida have a closed circulatory systemSimple diffusion is used for gas exchangeHave a digestive system that passes from mouth to anusCrop, gizzard, typhosoleAlso have a nervous system

+EvolutionEvolved from the seaOligochaetes developed from polychaete stockLeeches and oligochaetes have clitellum in commonEvolution relations between marine to freshwater.

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

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