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Echinodermata Spiny Skinned.
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Presentation transcript:

http://www.youtube.com/watch?v=Fo-gcZ78Ij0&mode=related&search=

Echinoderms The spiny misfits

General Characteristics Larvae have bilateral and adults have radial symmetry No head! Endoskeleton- calcium carbonate

Water vascular system Pattern of development in embryos is more similar to vertebrates

General Characteristics Number of arms is in multiples of 5 Separate sexes Nerve ring Open circulatory system Body cavity

Body Most are carnivorous with a complete digestive tract Nervous system is simple looking but these orgs have complex behavior Regeneration is highly developed

Network of water filled canals Water Vascular System Network of water filled canals Connects to the outside by a pore called the madreporite

Tube feet extend when filled with water thru canals Used for locomotion and attachment

CLASSES OF ECHINOS Asteroidea Echinoidea Holothuroidea Ophiuroidea Crinoidea

Slow moving, flexible arms Asteroidea- sea stars Slow moving, flexible arms Predators of bivalves, snails, barnacles (slow-moving or attached animals) Feed by everting stomach thru mouth http://www.youtube.com/watch?v=prCeHDa7GTQ

Echinoidea- sea urchins, sand dollars Round hard endoskeleton with movable spines Graze on sea weed and sea grasses as well as scavenge Aristotle’s lantern- special mouth and jaw parts http://www.youtube.com/watch?v=SRAfjvws13E http://www.youtube.com/watch?v=NdgyaRFgvQQ

Holothuroidea- sea cucumbers Worm like Deposit feeders Interesting defense mechanisms Secrete toxins Discharge mucus and toxins thru their anus Eviscerate guts thru mouth or anus (they’ll grow back) http://www.youtube.com/watch?v=lKWSLg5PDiU http://www.youtube.com/watch?v=vsLBOkYLLeI

Ophiuroidea- brittle stars Arms very flexible and can move quickly Deposit feeders Largest group of echinos but stay hidden http://www.youtube.com/watch?v=XV0KAr_M-7w&feature=related

Crinoidea- feather stars and sea lilies Suspension feeders with feathery arms for feeding Deep water and either attached to the bottom or crawl http://www.youtube.com/watch?v=affSVrHHDfk&mode=related&search= http://www.youtube.com/watch?v=m7X6q-dfslQ&mode=related&search=

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