Warm UpWhat characteristics do insects share?

Chapter 10Section 5

Discover ActivityHow do sea stars hold on? Page 358

Objectives:To list the main characteristics of

echinoderms.To name he major groups of echinoderms.

http://www.seinan-gu.ac.jp/~djohnson/natural/fauechinoderms.html

Echinoderms: The "Spiny-skinned" Animals Echinoderms include

starfish sea cucumbers sea urchinssand dollars

The water vascular system is a system of fluid-filled internal tubes that carry food and oxygen, remove wastes, and help echinoderms move.

All echinoderms use their tube feet to "walk". Some use them to get food.

Echinoderms have an endoskeleton made of hardened plates.

Adults have radial symmetry, usually in multiples of 5.

They reproduce sexually. The fertilized eggs develop into larva which undergo a metamorphosis to become adults.

http://www.belowsealevel1.com/echinoderms_03.htm

Star Fish

Starfish

Starfish have five or more arms (or rays) that extend from a central body.

Starfish have the ability to regenerate.They use their tube feet to capture prey and

to move.

http://stjohntour.com/Sealife/echinoderms.htm

http://sg.homeunix.com/hantu/echinoderms

Iconocaster longimanus

http://sg.homeunix.com/hantu/echinoderms

Sea star on intertidal flat

Basket Star

http://www.seasky.org/reeflife/sea2d1.html

Feather Starfish

http://www.pirx.com/gallery/echinoderms/urchin01

Starfish (with yellow polyps)

http://www.pirx.com/gallery/echinoderms/urchin01

Green Stripped Serpent Star

Blue Linkia Star Fish

http://www.belowsealevel1.com/echinoderms_07.htm

http://sg.homeunix.com/hantu/echinoderms

cushion star

Brittle StarsSimilar in appearance to star fish, but do not

have suction cups on their tube feet. Their arms are long and slender with flexible

joints.

http://www.pirx.com/gallery/echinoderms/urchin01

Brittle Star

http://www.pirx.com/gallery/echinoderms/urchin01

Dwarf Brittle Star

Sea CucumbersResemble a warty cucumberHead on one end and an anus at the otherMove along the ocean bottom by using the

five rows of tube feet on their body surface to wiggle back and forth

http://sg.homeunix.com/hantu/echinoderms

Blotched sea Cucumber

http://www.belowsealevel1.com/echinoderms_03.htm

Sea Cucumber

Slipper Sea Cucumber

http://www.seasky.org/reeflife/sea2d1.html

Sea Urchins and Sand DollarsBoth are round shaped and raylessSand dollars are flatSea urchins are dome shaped

Have long spines that are used for protectionSome have poisonous sacs found at the tip of

each spine that can deliver painful stings

http://www.pirx.com/gallery/echinoderms/urchin01

Purple-spined Sea Urchin

http://www.seasky.org/reeflife/sea2d1.html

Purple Sea Urchin

Rock-boring Urchin

Pencil sea urchin

http://www.seashells.org/identcatagories/seaurchins.htm

SAND DOLLAR -- Live

Dendraster excentricus

http://www.mbayaq.org/efc/living_species/print.asp?inhab=143

Tiny Florida Sand Dollar

Sea Shell Biscuits

Sea Shell Cookies

http://www.seashellworld.com/seashells/Sand.html

HomeworkGuided Reading and Study Workbook pages

149-151