Starfishes, sea urchins, sea cucumbers

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Presentation transcript:

Starfishes, sea urchins, sea cucumbers Phylum Echinodermata Starfishes, sea urchins, sea cucumbers

Higher Classification Echinodermata Class Asteroidea – sea stars Class Ophiuroidea – brittle stars Class Echinoidea – sea urchins Class Holothuroidea – sea cucumbers Class Crinoidea – sea feathers

General Characteristics Exclusively Marine Body unsegmented Adults with pentamerous secondary radial symmetry Larvae bilaterally symmetrical With unique water vascular system

Larval Echinoderms showing bilateral symmetry

Water Vascular System

General Characteristics cont. First phylum with internal skeleton With dermal calcareous ossicles Some with spines or spicules Digestive system complete Respiration by dermal branchae, tube feet, or respiratory tree No kidneys Dioecious Locomotion by tube feet, and/or arms

External Anatomy

Internal Anatomy

Brittle star anatomy

Anatomy of a Sea Urchin

Aristotle’s Lantern

Sea Urchin Anatomy

Asteroidea

Ophiurodea

Echinoidea

Holothuroidea

Crinoidea

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