Ehrlichia species in pond-farmed leeches (Hirudinaria sp ...
Phylum Annelida (Earthworms, Sandworms, Leeches)
description
Transcript of Phylum Annelida (Earthworms, Sandworms, Leeches)
Phylum Annelida (Earthworms, Sandworms, Leeches)
Phylum Annelida(Earthworms, Sandworms, Leeches)By: Veronica Weigandt
Key CharacteristicsBilaterally symmetricalClosed circulatory systemHas a nervous systemSegmentationTrue CoelomNo true respiratory organs
AnatomySegmentedIntestineAnusNerve CordCoelomSeptaDorsal/Ventral blood vesselNephridiaClitellum
Anatomy (Cont.)MouthPharynxEsophagusCropGizzard
Digestive1 way digestionFood goes into mouthPharynx helps food into mouthFood is stored in cropGizzard breaks down foodRest goes through intestines
RespirationSimple diffusionOxygen is consumed by body cellsCarbon dioxide diffuses through the body surface
Internal TransportClosed system of blood vesselsBlood pumps through bodyCirculation
ExcretionNephridium Fluid passes through nephridium into bladder-like sacSac opens through a pore in the skin & waste is discharged
ResponseHas a brainResponds to:OdorsChanges in moistureChanges in temperatureChanges in light
MovementVarious muscle groupsParapodiaSetae sinks into the groundLongitudinal muscles contract
ReproductionReproduction is sexualJoin head to tail; exchanging spermForms mocous sheathEggs get released into the sheathWorm backs out of sheathSperm gets released into the sheath & fertilization occursCocoon develops
Examples
LeechesSandwormsEarthwormsFactsOver 22,000 speciesThey live just about anywhere on earthMost are found in wet environmentsCan grow up to as long as 3 metersCan range in their color, patterning, and other features
Literature Citedhttp://www.bu.edu/gk12/eric/Annelida.pdfhttp://www.esu.edu/~milewski/intro_biol_two/lab__12_annel_arthro/Annelida.htmlhttp://www.infusion.allconet.org/webquest/annelida.htmlhttp://library.thinkquest.org/28751/review/animals/5.html#http://www.biology-questions-and-answers.com/annelids.htmlhttp://www.encyclopedia.com/topic/Annelida.aspx