Skip to main content
Biology LibreTexts

Sponges

There are two phyla of sponges: Calcarea and Silicea.

Preserved Specimens

1. Examine preserved sponges on display. Identify the osculum. Can you see pores?

Some of these specimens are shown below.

Click on the photographs below to view enlargements. Click "Back" to return here.

Chalina Spongila Commercial Sponge

Structure of Sponges

The photographs below are of Grantia. The body of this species is highly folded producing many chambers. In the last two photographs, the living cells have been removed to reveal the spicules.

2. Examine the following prepared slides: Grantia c.s.and Grantia l.s. Find collar cells, epidermal cells, and pores. What is the function of the collar cells? What is the function of the pores?

Click on the photographs below to view enlargements. Click "Back" to return here.

Grantia c.s. X 400 Grantia l.s. X 40

3. Examine a slide of Grantia spicules. What is the function of the spicules?

Click on the photographs below to view enlargements. Click "Back" to return here.

Grantia spicules X 40 Grantia spicules X 100