Sessile as Adults No True Tissues Asymmetrical Pores: Multiple Openings Digestion & Excretion: Diffusion No Nerves or Muscles.

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Sessile as Adults No True Tissues Asymmetrical Pores: Multiple Openings Digestion & Excretion: Diffusion No Nerves or Muscles

Forms: Polyp & Medusa Two Tissues Radial Symmetry One Opening Gastrovascular Cavity: digestion, excretion & circulation Basic Contractile & Nerve Network

Cylindrical body with tentacles projecting outward, stationary Digestive compartment with a single opening. Can function in circulation, body support, waste & gas exchange Umbrella shaped with tentacles, move freely

Flame Cells (Excretion) Acoelomates Digestion & Excretion: Diffusion One Opening Ganglia (Simple Nerve Cells) Muscle

Two Openings Simple Circulatory System Acoelomates

Muscles use Coelomic Fluid Pseudocoelomates No Circulatory System Protostomes = Complete Digestive System

Muscles use Coelomic Fluid Pseudocoelomates No Circulatory System Unsegmented Protostomes

Foot, Visceral Mass & Mantle Protostomes Shell (CaCO 3 ) Gills Open Circulatory System (cephalapods are closed)

No Joints Protostomes Diffusion Muscles Closed Circulatory System Segmented Nervous System (simple)

Subdivision of the body into repeated parts, allows for greater flexibility & mobility Blood pumped into body cavities, organs bathed directly in blood Blood is enclosed in vessels, distributes materials to the body

Jointed Limbs Protostomes Exoskeleton (chitin) Malphagion Tubes (excretion) Heart, Open Circulatory System Segmented

Bilateral Larva, Radial as Adults Diffusion Tube Feet Spiny Skin Water Vascular System