Echinoderms “spiny skinned” Ex: starfish, sea urchins, sea cucumbers, sand dollars.
Chapter 23 Invertebrate Diversity. 23.6 Echinoderms A. What are echinoderms? spiny-skinned animals...
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Transcript of Chapter 23 Invertebrate Diversity. 23.6 Echinoderms A. What are echinoderms? spiny-skinned animals...
Chapter 23
Invertebrate Diversity
23.6 Echinoderms
A. What are echinoderms? spiny-skinned animals with five-
part radial symmetry, an internal skeleton, a water vascular system, and suction cup-like structures called tube feet
live in the ocean
23.6 Echinoderms
B. Body Plan of Echinoderms 1. five symmetrical parts organized
around a center 2. water vascular system:
internal network of fluid-filled canals
a. madreporite: connects system to the outside
23.6 Echinoderms
B. Body Plan of Echinodermsb. ring canal: circles the digestive system in center
c. radial canals: extend into each body segment
d. tube feet: attached to radial canals; act like suction cups
Echinoderm anatomy
23.6 Echinoderms
C. Form & Function 1. Feeding: use tube feet to pry
open bivalve mollusks; some eat algae; others eat detritus
2. Respiration: occurs through tube feet
3. Internal Transport: digestive glands and body fluids
23.6 Echinoderms
C. Form & Function 4. Excretion: tube feet 5. Response
a. no head; primitive nervous systemb. eyespots sense light or darkc. Protection: hiding; spines ineffective defense
6. Movement: tube feet and muscles
Tube Feet
23.6 Echinoderms
C. Form & Function 7. Reproduction
a. sexual; separate sexes or hermaphrodites
b. asexual; regeneration abilities
Regeneration
Regeneration
Brittle Star
Sea Urchin
Sea Urchin Skeleton
Sand Dollar and Sand Dollar Skeleton
Sea cucumber
Sea cucumber
Feather star
Feather star
Crinoid