Cnidarians

Front 1

What are the five classes of cnidarians and their identifying characteristics?

Back 1

Hydrozoa: small, relatively common cnidarians. The vast majority are marine but this is the one cnidarian class with freshwater representatives. Most hydrozoans have life cycles that display alternation of generations however in some the medusa stage is lost and in some the polyp stage is very smallStaurozoa: all are marine they were formerly classified into an order within the class Scyphozoa. They lack a medusa stage but still use nematocysts to feedScyphozoa: they are all marine and are “true jellyfish” and spend most of their lives as the medusa.Cubozoa The class Cubozoa was formerly classified as an order in the scyphozoa. The medusa is cuboidal, and tentacles hang from each of its corners. Polyps are very small and in some are unknown. Cubozoans are active swimmers and feeders in worm tropical waters. Some posses dangerous nematocysts.Class Anthozoa: members of this class are colonial or solitary, and lack medusa. Their cnidocytes lack cnidoclis. They include anemones and stony and soft morals. Anthozoans are all marine and are found at all depths.

Front 2

What phylum do sea sponges belong to?

Back 2

Porifera

Front 3

What is a choanocyte, what is it for?

Back 3

a flagellated cell with a collar of protoplasm at the base of the flagellum, numbers of which line the internal chambers of sponges.

Front 4

What is a spicule? What is for? Where are they made?

Back 4

Each of the small needlelike or sharp-pointed structures of calcite or silica that make up the skeleton of a sponge. Formed of the mineralized substances calcium carbonate and silica, while others are made of an organic substance called spongin.

Front 5

What 3 cell types make up a sponge?

Back 5

Mesenchyme, Archaeocytes, Sclerocytes

Front 6

What phylum are sea walnuts a member of?

Back 6

Ctenophora

Front 7

What are the comb rows in ctenophora for?

Back 7

in order to capture prey, ctenophores possess sticky cells called colloblasts.

Front 8

What is the life cycle of a cnidarian?

Back 8

they spend either most of their life in a polyp stage or a medusa stage but all are a polyp at one point or another

Front 9

What is a planula?

Back 9

a free-swimming coelenterate larva with a flattened, ciliated, solid body.

Front 10

What is a nematocyst? Cnidocyst?

Back 10

Nematocyst: a specialized cell in the tentacles of a jellyfish or other coelenterate, containing a barbed or venomous coiled thread that can be projected in self-defense or to capture prey.

Cnidocyst: The cnidocyst is the defining organelle of the cnidarians, used for capture of prey and defense. It consists of a cylindrical capsule, which releases a long tubule upon triggering.

Front 11

Are cnidarians sexual or asexual, explain?

Back 11

Cnidarians are sexual because there has to be a transfer of genetic material

Front 12

Differences in gastrodermis/epidermis.

Back 12

The differences between gastrodermis and epidermis is that gastrodermis is the inner layer of cells that serves as a lining membrane of the gastrovascular cavity of Cnidarians and epidermis is the outer layer

Front 13

Sketch a simple drawing and identify the structures of Aurelia.

Front 14

Sketch a simple drawing and identify the structures of a sponge.