Radial Animals

What are the two body types of Cnidarians?

Polyp and Medusa

What are the three layers of Cnidarians?

Endoderm, Mesoglea, Ectoderm

What is the Mesoglea? What else can it be called?

A matrix of cells and fibers. Gastrodermis.

Which body type is the mesoglea more prominent?

medusa

What is the Endoderm? What can it also be called?

Innermost layer of tissue and also known as the gastrodermis.

What is the Ectoderm?

Outermost layer with a net of sensory cells.

What are the sensory cells called in the Ectoderm?

Ocelli and statocysts.

What is the one unique cell in the Ectoderm?

Cnidocyte (or cnidoblast) - they have a harpoon-like structure called nematocytes used for hunting.

What are the classifications of Cnidarians? What kind of body types do they have?

1. Hydrozoa - both medusa and polyp are important.

2. Scyphozoa - most have medusa’s as the most important form.

3. Anthozoa - polyp form only.