Starfish Dissection

Starfish Dissection

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

STARFISH meaning ANIMALIA KINGDOM _____________ LATIN

ECHINODERMATA spiny skin PHYLUM _____________________________ ASTEROIDEA

star-like CLASS _______________________________ SPINY SKIN

http://wwwbio200.nsm.buffalo.edu/labs/tutor/Starfish SPINES for protection connect to ENDOSKELETON inside underneath skin

OSSICLES Calcium carbonate plates form endoskeleton inside http://ebiomedia.com/prod/BOechinoderms.html

SPINES PEDICELLARIA SKIN GILLS Image 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 inside

Image by Riedell Skin gills between spines

http://wwwbio200.nsm.buffalo.edu/labs/tutor/Starfish EXCHANGE GASES and EXCRETE NITROGEN WASTE TUBE FEET surfaces

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

Madreporite Opening to water vascular system http://ebiomedia.com/gall/skin/skin1.html

WATER VASCULAR SYSTEM BIODIDAC http://mbgnet.mobot.org/salt/animals/star.jpg

AMBULACRAL GROOVE TUBE FEET sit in GROOVE TUBE FEET Used for feeding &

locomotion Dissection Steps 1. Begin cutting down the central part of ray 1. Identify Digestive Glands 2. Identify connection of digestive glands to the

pyloric stomach 2. Investigate stomach 1. Find Pyloric and Cardiac Stomachs 2. Find where Pyloric Stomach connects to digestive glands and anus

3. Find stone canal and Madroporite 1. Examine Tube Feet, Gonads, Radial & Ring Cannals, Ampullae Begin to cut down

central part of ray DIGESTIVE GLAND Makes BILE ABSORBS NUTRIENTS

ttp://www.k-state.edu/organismic/echinoderms_and_protochordates.htm 2 part STOMACH DIGESTIVE SYSTEM

ANUS DIGESTIVE GLANDS DIGESTIVE

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

CARDIAC stomach connects to mouth (extruded during feeding) PYLORIC stomach connects to digestive glands and ANUS http://wwwbio200.nsm.buffalo.edu/labs/tutor/Starfish/

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

system) AMBULACRAL RIDGE AMPULLAE (tops of tube feet)

OSSICLES Calcium carbonate plates form endoskeleton inside http://ebiomedia.com/prod/BOechinoderms.html

GONADS http://www.k-state.edu/organismic/echinoderms_and_protochordates.htm NERVOUS SYSTEM NERVE RING

encircles mouth RADIAL NERVES run inside AMBULACRAL RIDGE in each arm SEPARATE SEXES

GONADSreproductive organs Starfish have both SEXUAL ASEXUAL (Regeneration) http://www.k-state.edu/organismic/echinoderms_and_protochordates.htm

DIGESTIVE GLAND GONAD OSSICLES

SEXUAL REPRODUCTION FERTILIZATION EXTERNAL

DEVELOPMENT INDIRECT LARVA

BIPINNARIA Has BILATERAL SYMMETRY and wings to swim

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