STARFISH DISSECTION. STARFISH LATIN meaning KINGDOM _____________ PHYLUM _____________________________ CLASS _______________________________ ANIMALIA.

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Presentation transcript:

STARFISH DISSECTION

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

Starfish (sea stars) Come in a variety of colors

... and sizes

Not all starfish have 5 arms

SYMMETRY ADULTS- Radial LARVA- Bilateral

PENTARADIAL (5 armed starfish)

SPINY SKIN SPINES for protection connect to ENDOSKELETON inside underneath skin

OSSICLES Calcium carbonate plates form endoskeleton inside

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

Skin gills between spines EXCHANGE GASES and EXCRETE NITROGEN WASTE

TUBE FEET surfaces Can exchange gases and excrete nitrogen waste

EYESPOTS Sense light/dark

ORAL VIEW

Opening to water vascular system Madreporite

WATER VASCULAR SYSTEM

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

CUT TRIVIUM

DIGESTIVE GLAND Makes BILE ABSORBS NUTRIENTS

2 part STOMACH

DIGESTIVE SYSTEM DIGESTIVE GLANDS DIGESTIVE GLANDS MOUTH ANUS

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

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

SEPARATE SEXES Starfish have 2 sets of gonads (hermaphrodites) Sexual and asexual reproducation (Regeneration)

DIGESTIVE GLAND GONAD OSSICLES

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