Animasi dan bahan ajar Biologi SMA Cnidaria

Phylum Cnidaria or Coelenterata

The Basics

_{Two tissue layers - an outer epidermis and}

an inner gastroderm

_{Nerve net with stinging capsules called}

nematocysts

_{Radial symmetry with 2 body types - a}

The coral animal may

live as a free-floating

polyp or build colonies

into reefs. Not all

Stony Coral

_{Hermatypic or reef builders}

_{Polyp grows in 6 parts to form a body of}

calcium carbonate

Soft Coral

_{Polyps with 8 tentacles} _{While part of the reef,}

they do not build reefs because their bodies are a soft keratin.

Hydrocoral

_{False corals resemble the anemone}

_{contain powerful nematocysts that cause}

skin irritation

Some cnidarians

exist as

individuals and

others live as

It has a gas filled float and

individuals that function like

specialized organs. Some are

Cnidarians

Hydrozoans - Class Hydrozoa

_{Feathery or Bushy colonies of tiny polyps} _{Polyps may be specialized}

_{Attach to pilings, shells, seaweed, etc.} _{Siphonophores - hydrozoans that form}

Scyphozoans - Class Scyphozoa

_{Larger jellyfish}

_{Bell of some medusae may reach 2 m.}

Anthozoans - Class Anthozoa

_{Solitary or colonial polyps that lack a}

medusa stage.

_{Sea anemones}

Textbook readings