Porifera

Cnidaria

Platyhelminthes

Nematoda

Representative Animal

Sponge

Jellyfish

Flatworm

Nematode

Types of Symmetry

None

Radial

Bilateral

Bilateral

Body Plan

Acoelemate

Acoelemate

Acoelemate

Pseudocoelemate

Type of Digestion

Amoebocytes

Gastrovascular cavity

Gastrovascular cavity

Complete digestive tract

Method of Transport Inside Body

Amoebocytes

Diffusion

Diffusion

Fluid in pseudocoelem

Method of Gas Exchange

Pores

Diffusion

Diffusion through skin

Diffusion

Method of Waste Disposal

Out through mouth (no excretory organs)

Out through mouth (no excretory organs)

Photonephridia (flame-bulb cells)

Nephridia

Type of Nervous System

None

Noncentralized nerve net

Nevre cords

Nerve cords

Method of Reproduction

Asexual (fragments breaking off or gemmules); seuxal (internal)

Budding by polyps; sexual by medusa

Asexual (regeneration); sexual

Sexual (internal)

Distinguishing Feature

No tissues

Cnidocytes (stinging cells at the end of chemicals)

Organs

Pseudocoelem