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Invertebrates Name:_________________________________________Class:__________Date:____________Vocabulary
Term Definition
cartilage Firmtissuethatprovidesflexiblesupportinanimalskeletons.
invertebrates Animalsthatlackbackbones.vertebrates Animalsthathavebackbonesofbonesorcartilage.
cartilage Firmtissuethatprovidesflexiblesupportinanimalskeletons.
How are these jellyfish like an insect? Jellyfishandinsectsdon'tseemtohavemuchincommon.Theylookmuchdifferent.Theyliveinverydifferentenvironments.Butbothoftheseanimalsareclassifiedasinvertebrates. What Are Invertebrates? Animalsareoftenidentifiedasbeingeitherinvertebratesorvertebrates.Thesearetermsbasedontheskeletonsoftheanimals.Vertebrateshaveabackbonemadeofboneorcartilage(cartilageisaflexiblesupportivetissue.Youhavecartilageinyourearlobes.).Invertebrates,ontheotherhand,havenobackbone.Invertebrateslivejustaboutanywhere.Therearesomanyinvertebratesonthisplanet
thatitisimpossibletocountthemall.Thereareprobablybillionsofbillionsofinvertebrates.Theycomeinmanyshapesandsizes,livepracticallyanywhereandprovidemanyservicesthatarevitalforthesurvivalofotherorganisms,includingus.Theyhavebeenobservedintheupperreachesoftheatmosphere,inthedriestofthedesertsandinthecanopiesofthewettestrainforests.TheycanevenbefoundinthefrozenAntarcticoronthedeepestpartsoftheoceanfloor.
Snailsareanexampleofinvertebrates,animalswithoutabackbone.AllvertebrateorganismsareinthephylumChordata.Invertebrates,whichmakeupabout95%(ormore)oftheanimalkingdom,aredividedintoover30differentphyla,someofwhicharelistedinthetable.Numerousinvertebratephylahavejustafewspecies;somehaveonlyonedescribedspecies,yettheseareclassifiedintoseparatephylabecauseoftheiruniquecharacteristics.Forexample,sponges,withporesthroughouttheirbody,arefromthephylumPorifera.Crabsand
lobsters,withjointedappendages,arefromthephylumArthropoda.Phylum Meaning Examples
Porifera Porebearer SpongesCnidaria Stingingnettle Jellyfish,coralsPlatyhelminthes Flatworms Flatworms,tapewormsNematoda Threadlike Nematodes,heartwormMollusca Soft Snails,clamsAnnelida Littlering Earthworms,leechesArthropoda Jointedfoot Insects,crabsEchinodermata Spinyskin Seastars,seaurchins
Summary
• Invertebratesareanimalswithoutabackbone.• Invertebratesincludeinsects,earthworms,jellyfish,andmanyotheranimals.
Review 1. Whatarethreeexamplesofinvertebrates?
2. Howdoyoudetermineifananimalisaninvertebrate?
3. Aboutwhatpercentoftheanimalkingdomiscomposedofinvertebrates?