STARFISH DISSECTIONhttp://www.emerchandise.com/images/p/SBS/pdPASBS0005.jpg

Kidspiration by Riedell

SYMMETRYADULTS- Radial

LARVA- Bilateralhttp://www.uic.edu/classes/bios/bios100/labs/radial.jpg

STARFISH LATIN meaningKINGDOM _____________

PHYLUM _____________________________

CLASS _______________________________ANIMALIAECHINODERMATA spiny skinASTEROIDEA star-like

SPINY SKINSPINES for protection connect to ENDOSKELETON inside underneath skinhttp://wwwbio200.nsm.buffalo.edu/labs/tutor/Starfish

OSSICLESCalcium carbonate plates form endoskeleton insidehttp://ebiomedia.com/prod/BOechinoderms.html

SPINES PEDICELLARIA SKIN GILLSImage by Riedell

PEDICELLARIAE(sing. Pedicellaria)Keep surface clear of organisms

SKIN GILLS Hollow skin tubes that project from skin for increased surface area connect to coelom insideImage by Riedell

Skin gills between spinesEXCHANGE GASES and EXCRETE NITROGEN WASTEhttp://wwwbio200.nsm.buffalo.edu/labs/tutor/Starfish

TUBE FEET surfaceshttp://wwwbio200.nsm.buffalo.edu/labs/tutor/Starfish

EYESPOTSSense light/dark

ORAL VIEWhttp://wwwbio200.nsm.buffalo.edu/labs/tutor/Starfish

http://wwwbio200.nsm.buffalo.edu/labs/tutor/Starfish

http://ebiomedia.com/gall/skin/skin1.htmlOpening to water vascular systemMadreporite

WATER VASCULAR SYSTEMBIODIDAC

http://mbgnet.mobot.org/salt/animals/star.jpg

AMBULACRAL GROOVETUBE FEET sit in GROOVE

TUBE FEETUsed for feeding & locomotion

Dissection StepsBegin cutting down the central part of rayIdentify Digestive GlandsIdentify connection of digestive glands to the pyloric stomach Investigate stomachFind Pyloric and Cardiac StomachsFind where Pyloric Stomach connects to digestive glands and anusFind stone canal and MadroporiteExamine Tube Feet, Gonads, Radial & Ring Cannals, Ampullae

Begin to cut down central part of ray

DIGESTIVE GLANDMakes BILEABSORBS NUTRIENTS

http://www.k-state.edu/organismic/echinoderms_and_protochordates.htm

2 part STOMACH

DIGESTIVE SYSTEMDIGESTIVEGLANDSDIGESTIVEGLANDSMOUTHANUS

CARDIAC stomach connects to mouth (extruded during feeding)PYLORIC stomach connects to digestive glands and ANUShttp://www.k-state.edu/organismic/echinoderms_and_protochordates.htm

http://wwwbio200.nsm.buffalo.edu/labs/tutor/Starfish/

AMBULACRAL RIDGE covered by OSSICLES contains RADIAL NERVE (nervous)RADIAL CANAL (water vascular system)http://wwwbio200.nsm.buffalo.edu/labs/tutor/Starfish/

AMBULACRAL RIDGE

OSSICLESCalcium carbonate plates form endoskeleton insidehttp://ebiomedia.com/prod/BOechinoderms.html

GONADS

http://www.k-state.edu/organismic/echinoderms_and_protochordates.htm

NERVOUS SYSTEMNERVE RING encircles mouthRADIAL NERVES run inside AMBULACRAL RIDGE in each arm

SEPARATE SEXESGONADS- reproductive organs Starfish have both SEXUAL ASEXUAL (Regeneration)

http://www.k-state.edu/organismic/echinoderms_and_protochordates.htm

DIGESTIVEGLANDGONADOSSICLES

LARVAFERTILIZATIONEXTERNALINDIRECTHas BILATERAL SYMMETRY and wings to swimBIPINNARIA DEVELOPMENTSEXUAL REPRODUCTION