(2) 10-20

Tissue Layers for Phylum Cnidaria

Diploblastic

What is the name of the noncellular “layer” for Phylum Cnidaria?

Mesoglea

Type of Digestive System for Phylum Cnidaria

Gastrovascular Cavity

What type of digestion do Phylum Cnidaria have?

Extra- and intracellular

Type of Nervous System for Phylum Cnidaria

Nerve net

Type of Asexual Reproduction for Phylum Cnidaria

Budding

Type of Sexual Reproduction for Phylum Cnidaria

Gametes, monoecious or dioecious

What type of animals are hydrozoa usually?

very small, predatory animals

What body types do Class Hydrozoa demonstrate?

both a polyp and medusa stage

What is the name of the “shelf” seen on the medusa?

velum

How are the polyps usually arranged?

colonial

What body form do Hydra possess?

only a polyp body form

(Budding) Asexual Reproduction

Testes

Ovary

How do Hydra reproduce asexually? Sexually?

asexually by budding

both males and females with testes or ovaries

Why are Hydra especially interesting to biologists?

their regenerative ability

What body form do Obelia possess?

both the polyp and medusa stages

What is the specialized structure used for feeding? For reproduction? For Obelia

feeding = hydranth

reproduction=gonangium

What body form do Portuguese Man of War possess? What is it made up of?

It possess siphonophore, made up of zooids

What is the name of the specialized structure used as a float?

pneumatophore

What do the stings cause?

whip-like, red welts on the skin

What body form do Gonionemus possess?

a small jelly

What is Gonionemus often called?

Clinging jelly

What are Class Scyphozoa usually called?

true jellies

What makes the medusa different from the hydrozoa?

they usually lack a vellum

How are Moon Jellies often recognized?

four horseshoe-shaped gonads

What are Moon Jellies only capable of when they swim?

limited motion, drifts with current

What makes Class Anthozoa different from the other cnidarians?

No medusa stage in their development

What does the word Anthozoa mean?

flower animal

What body shape do Sea Anemones have?

cylindrical, mouth at the top, foot at the bottom

What habitat are Sea Anemones found in?

Low Tide Zone in calmer waters