Invertebrate Diversity

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Presentation transcript:

Invertebrate Diversity 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

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

B. Body Plan of Echinoderms b. 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

2. Respiration: occurs through tube feet 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

6. Movement: tube feet and muscles 23.6 Echinoderms C. Form & Function 4. Excretion: tube feet 5. Response a. no head; primitive nervous system b. eyespots sense light or dark c. Protection: hiding; spines ineffective defense 6. Movement: tube feet and muscles

Tube Feet

C. Form & Function 7. Reproduction 23.6 Echinoderms 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