STARFISH DISSECTION

http://www.emerchandise.com/images/p/SBS/pdPASBS0005.jpg

Kidspiration by Riedell

SYMMETRY

ADULTS- Radial

LARVA- Bilateral

http://www.uic.edu/classes/bios/bios100/labs/radial.jpg

INVERTEBRATES(No backbone)

ALL INVERTEBRATES ARE PROTOSTOMES EXCEPT

ECHINODERMS

ONLY INVERTEBRATES that are DEUTEROSTOMES

STARFISH LATIN

meaningKINGDOM _____________

PHYLUM _____________________________

CLASS _______________________________

ANIMALIA

ECHINODERMATA “spiny skin”

ASTEROIDEA “star-like”

SPINES PEDICELLARIA SKIN GILLS

Image by Riedell

SPINY SKIN

SPINES for protection connect to ENDOSKELETON inside underneath skin

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

OSSICLESCalcium carbonate plates

form endoskeleton insidehttp://ebiomedia.com/prod/BOechinoderms.html

SPINES PEDICELLARIA SKIN GILLS

Image by Riedell

PEDICELLARIAE(sing. Pedicellaria)

Keep surface clear of organisms

SKIN GILLSHollow skin tubes that project from skin for increased surface area

connect to coelom inside

Image by Riedell

Skin gills between spines

EXCHANGE GASES and EXCRETE NITROGEN WASTE

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

TUBE FEET surfaces

Can exchange gases and excrete nitrogen waste http://wwwbio200.nsm.buffalo.edu/labs/tutor/Starfish

EYESPOTS

Sense light/dark

ORAL VIEW

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

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

http://ebiomedia.com/gall/skin/skin1.html

Opening to water vascular system

Madreporite

WATER VASCULAR SYSTEM

BIODIDAC

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

ORAL VIEW

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

AMBULACRAL GROOVE

TUBE FEET sit in GROOVE

TUBE FEETUsed for feeding & locomotion

Can exchange gases and excrete nitrogen waste http://wwwbio200.nsm.buffalo.edu/labs/tutor/Starfish

CUT TRIVIUM

DIGESTIVE GLAND

Makes BILEABSORBS NUTRIENTS

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

2 part STOMACH

DIGESTIVE SYSTEM

DIGESTIVEGLANDS

DIGESTIVEGLANDS

DIGESTIVEGLANDS

MOUTH

ANUS

CARDIAC stomach connects to mouth(extruded during feeding)

PYLORIC stomach connects to digestive glands and ANUS

http://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/

WATER VASCULAR SYSTEM

BIODIDAC

AMBULACRAL RIDGE

AMPULLAE (tops of tube feet)

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 mouth

RADIAL NERVES run inside AMBULACRAL RIDGE in each arm

SEPARATE SEXES

GONADS-reproductive organs

Starfish have bothSEXUAL ASEXUAL (Regeneration)

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

DIGESTIVEGLAND

GONAD

OSSICLES

MOLLUSKS (some ANNELIDS)

Have aTROCHOPHORE LARVA

http://www.okc.cc.ok.us/biologylabs/Images/Evolimages/trochophore.JPG

LARVA

FERTILIZATION EXTERNALINDIRECT

Has BILATERAL SYMMETRYand wings to swim

BIPINNARIA

SEXUAL REPRODUCTION

DEVELOPMENT

ASEXUAL REPRODUCTION

Ability to self amputate

Ability to regrow lost parts

AUTOTOMY

REGENERATION

Starfish dissection

By: Carol ParkerThanks to: Denise Roper and Lynn Fink

Dried Specimens

Common StarfishClass Asteroidea

Aboral view

bivium

trivium

arms

central disc

anterior arm

Madreporite

bivium

trivium

madreporitestone canal

madreporite

stone canalperistome

circular canal

radial canal

peristome

Oral view

Mouth

Ambulacral Grooves

Arms

Spines

Tube feet

Preserved Specimens

madreporite

anterior arm

central disk

bivium

ambulacral grooves mouth

tube feet

peristome

mouth

intestine

anus intestinal caecum

pyloric stomach

pyloric caecum

pyloric duct

pyloric stomach

Pyloric caecum

Pyloric stomach

Pyloricstomach

Pyloric caecae

Gonads

Cardiac stomach

cardiac stomach

peristome

Cardiac stomach

polian vesicleradial canal

circular canalampulla

tube feet radial canal

ampulla