STARFISH DISSECTION

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Presentation transcript:

STARFISH DISSECTION

Kidspiration by Riedell

STARFISH LATIN meaning KINGDOM _____________ PHYLUM _____________________________ CLASS _______________________________ ANIMALIA ECHINODERMATA “spiny skin ” ASTEROIDEA “star-like”

SYMMETRY ADULTS- Radial LARVA- Bilateral

PENTARADIAL (5 armed starfish)

ORAL VIEW

SPINY SKIN SPINES for protection connect to ENDOSKELETON inside underneath skin

OSSICLES Calcium carbonate plates form endoskeleton inside

Skin gills between spines EXCHANGE GASES and EXCRETE NITROGEN WASTE

EYESPOTS Sense light/dark

Opening to water vascular system Madreporite

WATER VASCULAR SYSTEM BIODIDAC

ORAL VIEW MOUTH

AMBULACRAL GROOVE TUBE FEET sit in GROOVE

TUBE FEET Used for feeding & locomotion

TUBE FEET Used for feeding & locomotion Can exchange gases and excrete nitrogen waste

DIGESTIVE GLAND Makes BILE ABSORBS NUTRIENTS

2 part STOMACH

DIGESTIVE SYSTEM DIGESTIVE GLANDS DIGESTIVE GLANDS MOUTH ANUS Image by Riedell

CARDIAC stomach connects to mouth (extruded during feeding) PYLORIC stomach connects to digestive glands and ANUS

EUCOELOM OPEN CIRCULATION

ENDOSKELETON made of OSSICLES

OSSICLES Calcium carbonate plates form endoskeleton inside

WATER VASCULAR SYSTEM BIODIDAC

GONADS

AMBULACRAL RIDGE covered by OSSICLES contains RADIAL NERVE (nervous) RADIAL CANAL (water vascular system)

AMBULACRAL RIDGE AMPULLAE (tops of tube feet)

NERVOUS SYSTEM follows WVS NERVE RING encircles mouth RADIAL NERVES run inside AMBULACRAL RIDGE in each arm Image by Riedell

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

DIGESTIVE GLAND GONAD OSSICLES

LARVA FERTILIZATION EXTERNAL INDIRECT Has BILATERAL SYMMETRY and wings to swim BIPINNARIA SEXUAL REPRODUCTION DEVELOPMENT

ASEXUAL REPRODUCTION Ability to self amputate Ability to regrow lost parts AUTOTOMY REGENERATION