Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
14 Cards in this Set
- Front
- Back
|
What are the five classes of cnidarians and their identifying characteristics? |
Anthozoa - Sea anemones, corals Hydrozoa - Hydra, Portuguese man-o-war Scyphozoa - Jellyfish Cubozoa - Box jellies Staurazoa - Star jellies |
|
|
What phylum do sea sponges belong to? |
Sponges belong to the phylum known as porifera. |
|
|
What is a choanocyte, what is it for? |
Choanocytes are cells located on the whip-like appendages, called flagella, located in the sponge. They are cells that line the interior of asconoid, syconoid and leuconoid body type sponges that contain a central flagellum, or undulipodia, surrounded by a collar of microvilli which are connected by a thin membrane. |
|
|
What is a spicule? What is for? Where are they made? |
spicules are formed of the mineralized substances calcium carbonate and silica, while others are made of an organic substance called spongin. Spongin skeletons were and are used as scrubbers in bathtubs. |
|
|
What 3 cell types make up a sponge? |
Choanocytes Microvilli Flagellated cells |
|
|
What phylum are sea walnuts a member of? |
Mnemiopsis |
|
|
What are the comb rows in ctenophora for? |
They release their eggs and sperm into the water to be fertilized. |
|
|
What is the life cycle of a cnidarian? |
Cnidarians all have a life cycle of two forms. One is a free-swimming jellyfish medusa stage and the second is an attached polyp stage. |
|
|
What is a planula? |
The ciliated larva of a cnidarian |
|
|
What is a nematocyst? Cnidocyst? |
an organ in consisting of a minute capsule containing a thread that causes a sting. Cnidocyst is an explosive cell containing one giant organelle or cnida (plural cnidae) that defines the phylum Cnidaria |
|
|
Are cnidarians sexual or asexual, explain? |
Not all cnidarians reproduce sexually, with many species having complex life cycles of asexual polyp stages and sexual medusae. Some, however, omit either the polyp or the medusa stage. |
|
|
Differences in gastrodermis/epidermis. |
The epidermis refers to the outer layer of skin The gastrodermis refers to the inner layer of cells lining the gastrovascular cavity of Cnidarians |
|
|
Sketch a simple drawing and identify the structures of Aurelia. |
|
|
|
Sketch a simple drawing and identify the structures of a sponge. |
|
