ECHINODERMS

MEGAN SNYDER AND ANITA SOEMER

http://www.bing.com/images/search?q=starfish+labeled&qs=IM&form=QBIRMH&pq=starfish+label&sc=8-14&sp=1&sk=#view=detail&id=47996ECADFA4F713FD24356D6F1E7EA504247D96&selectedIndex=0

WHAT TYPE OF SYMMETRY?

RADIAL

ALL IMAGES: GOOGLE.COM/IMAGES

HOW DO THEY MOVE?

• TUBE FEET

• EACH ARM HAS HUNDREDS OF TUBES

• SUCKERS TO NAVIGATE

• WATER VASCULAR SYSTEM

SYSTEMS

WATER VASCULAR SYSTEM?

• LOCOMOTION

• FOOD & WASTE TRANSPORTATION

• RESPIRATION

NERVOUS SYSTEM

• PRESENT IN ENTIRE BODY

• SENSORY CELLS GATHER INFORMATION ABOUT SURROUNDINGS

• NERVE RING HELPS COORDINATE MOVEMENT

• EYE SPOTS DETECT LIGHT

DIGESTIVE SYSTEM

• ONE-WAY (ANUS AND MOUTH)

• PUSH STOMACH OUTSIDE BODY

• EAT DECOMPOSING ANIMAL OR PLANT

• DIGEST EXTERNALLY

EXCRETORY SYSTEM

• PRESENT

• OSMOSIS/DIFFUSION

• RID BODIES OF NITROGENOUS WASTE

• WATER VASCULAR SYSTEM

• NO KIDNEYS

CIRCULATORY SYSTEM

• OPEN/OSMOSIS/DIFFUSION

• NO TRUE HEART

• WATER PUMPED THROUGH BODY

• CILIA CIRCULATES FLUIDS

• FLUID-FILLED CANALS FOR GAS EXCHANGE

RESPIRATORY SYSTEM

• DIFFUSION/OSMOSIS

• GILLS, CUTANEOUS, LUNGS

• TAKE IN OXYGEN & PASS OUT CO2

• WATER VASCULAR SYSTEM

SUPPORT OR SKELETAL SYSTEM

• ABSENT

• ENDOSKELETON

• COVERED BY EPIDERMIS

• OSSICLES FIT CLOSE AND LOOSE

REPRODUCTIVE SYSTEM

• SEXUAL MORE COMMON

• TWO-THREE YEARS

• RELEASE EGG/SPERM INTO WATER

• FEMALE CAN RELEASE 100 MILLION EGGS

• CAN REGROW

ASTEROIDEA

• SEA STARS

• 5-40 ARMS

• CENTRAL DISK

• CIRCULAR TO PENTAGONAL

• TUBE FEET AS SENSORY RECEPTORS

OPHIUROIDEA

• BRITTLE STARS, BASKET STARS, SNAKE STARS

• 5-10 ARMS

• RARELY MORE THAN 5

• ARMS LENGTH SEVERAL TIMES DISK DIAMETER

• DISK DIAMETER FROM 3MM TO 150MM

ECHINOIDEA

• SEA URCHINS, HEART URCHINS, SAND DOLLARS

• LACKING ARMS

• HAVE A SPINY SHELL

• TEST MADE FROM FUSED SKELETAL PLATES

CRINOIDEA

• SEA LILIES, FEATHER STARS

• STALKED, DETRITUS-FEEDING, AND SESSILE

• AT LEAST 10 ARMS

• SEA LILIES UP TO 40 ARMS

• FEATHER STARS UP TO 200 ARMS

HOLOTHUROIDEA

• SEA CUCUMBERS

• LIE ON SIDES

• SKELETON REDUCED TO OSSICLES EMBEDDED IN SKIN

• NO ARMS, TUBE FEET AROUND MOUTH

• FORM CIRCLE OF 10-30 TENTACLES

“SPINY SKINNED”?

• LITERAL SPINY SKIN

• MADE FROM CALCIUM CARBONATE

• FOR PROTECTION

• CAN CONTAIN POISON

WHERE DO THEY LIVE?

• MARINE ENVIRONMENTS

• SALT WATER

• OCEANS

• SHALLOW TIDE POOLS

MADREPORITE

• SIEVE-LIKE PLATE IN SOME ECHINODERMS

• HOW WATER PASSES INTO VASCULAR SYSTEM

1. STOMACH

http://www.bing.com/images/search?q=starfish+stomach&qs=n&form=QBIR&pq=starfish+stomach&sc=6-16&sp=-1&sk=#view=detail&id=0AA83808D454A326E782412CB2B4AF136D7504ED&selectedIndex=3

2. SPINE

http://www.bing.com/images/search?q=starfish+spine&qs=n&form=QBIR&pq=starfish+spine&sc=8-11&sp=-1&sk=#view=detail&id=E777C25E1282F5CB22FF90AF917CF1A918455EB6&selectedIndex=6

3. GILLS

http://www.bing.com/images/search?q=starfish+gills&qs=n&form=QBIR&pq=starfish+gills&sc=8-11&sp=-1&sk=#view=detail&id=EE256098E00D16A9DB50C9EF4726C03598FA4C61&selectedIndex=0

4. MADREPORITE

http://www.bing.com/images/search?q=starfish+madreporite&qs=AS&sk=&FORM=QBIR&pq=starfish%20madre&sc=8-14&sp=1&qs=AS&sk=#view=detail&id=7A432ED4EB09743A6481B94FDCB0D98AC77A88C0&selectedIndex=2

5. GONADS

http://www.bing.com/images/search?q=starfish+gonads&qs=n&form=QBIR&pq=starfish+gonads&sc=3-15&sp=-1&sk=#view=detail&id=327D8D3B2F6402F4510D00B158AB985119AC17B9&selectedIndex=16

6. RING CANAL

http://www.bing.com/images/search?q=starfish+ring+canal&qs=n&form=QBIR&pq=starfish+ring+canal&sc=2-18&sp=-1&sk=#view=detail&id=3B627EF5F5692E076621EB150DFA1C6B3AA8906F&selectedIndex=28

7. RADIAL NERVE

http://www.bing.com/images/search?q=starfish+radial+nerve&qs=n&form=QBIR&pq=starfish+radial+nerve&sc=0-16&sp=-1&sk=#view=detail&id=66722A0A60C2B74D9CD2009B7E0EDD0C2EAC6E29&selectedIndex=3

8. TUBE FEET

http://www.bing.com/images/search?q=starfish+tube+feet&qs=n&form=QBIR&pq=starfish+tube+feet&sc=4-16&sp=-1&sk=#view=detail&id=4EC511AED357393369A3BFF612F19E5166BFF6C2&selectedIndex=6

9. AMPULLA

http://www.bing.com/images/search?q=starfish+ampulla&qs=n&form=QBIR&pq=starfish+ampulla&sc=4-15&sp=-1&sk=#view=detail&id=5CE6CAFCD3DD0F2A2A532C0235784C34F74CD237&selectedIndex=11

10. RADIAL CANAL

http://www.bing.com/images/search?q=starfish+radial+canal&qs=n&form=QBIR&pq=starfish+radial+canal&sc=2-20&sp=-1&sk=#view=detail&id=EE256098E00D16A9DB50F712A0DACEFC622E5E2F&selectedIndex=2

11. DIGESTIVE GLANDS

http://www.bing.com/images/search?q=starfish+digestive+glands&qs=n&form=QBIR&pq=starfish+digestive+glands&sc=2-21&sp=-1&sk=#view=detail&id=9E9065F2F615879D7A529BA0C72438AC1491D244&selectedIndex=0

12. ANUS

http://www.bing.com/images/search?q=starfish+anus&qs=n&form=QBIR&pq=starfish+anus&sc=1-13&sp=-1&sk=#view=detail&id=9E9065F2F615879D7A52B5EDBDD664EFCC5C6C40&selectedIndex=48

13. CENTRAL DISK

http://www.bing.com/images/search?q=starfish+without+arms&qs=n&form=QBIR&pq=starfish+without+arms&sc=2-17&sp=-1&sk=#view=detail&id=0A01B20EB43DA980636CCBE738472A8FB3CA7254&selectedIndex=15