Unit 4:

Inve

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THE SIMPLEST INVERTEBRATES

Porifera and Cnidaria

THE SIMPLESTINVERTEBRATES

Porifera:Live in the sea

Their bodies are full of pores and channels

They feed by filtration

THE SIMPLESTINVERTEBRATES

Feeding of the Porifera:

Osculum

Pores

Water

Central cavity

The water enters though the central cavity and leaves through a hole called osculum

THE SIMPLESTINVERTEBRATES

Cnidaria:Radial Symetry

Soft body with tentaclesA gastrovascular cavity connected to the mouthNutricion. Cnidaria are carnivorous

THE SIMPLESTINVERTEBRATES

Cnidaria:Live in the seaReproduction. In their lifetime, cnidaria usually pass through both two stages:

THE SIMPLESTINVERTEBRATES

Reproduction of Cnidaria:Stages:

Polyp Medusa

Asexual Sexual