STARFISH DISSECTION

SYMMETRY ADULTS- Radial LARVA- Bilateral

INVERTEBRATES (No backbone) ALL INVERTEBRATES ARE PROTOSTOMES EXCEPT ECHINODERMS INVERTEBRATES DEUTEROSTOMES

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

SPINES PEDICELLARIA SKIN GILLS

SPINY SKIN SPINES for protection connect to ENDOSKELETON underneath skin

PEDICELLARIAE (sing. Pedicellaria) Keep surface clear of organisms

SKIN GILLS Hollow skin tubes that project from skin for increased surface area EXCHANGE GASES and EXCRETE NITROGEN WASTE

EYESPOTS

ORAL VIEW

Madreporite

WATER VASCULAR SYSTEM

ORAL VIEW

AMBULACRAL GROOVE

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 ANUS DIGESTIVE DIGESTIVE DIGESTIVE GLANDS GLANDS MOUTH

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

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

WATER VASCULAR SYSTEM

AMBULACRAL RIDGE AMPULLAE (tops of tube feet)

GONADS

NERVOUS SYSTEM NERVE RING encircles mouth RADIAL NERVES run inside AMBULACRAL RIDGE in each arm

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

DIGESTIVE GLAND GONAD OSSICLES

MOLLUSKS (some ANNELIDS) Have a TROCHOPHORE LARVA

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

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