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14 Cards in this Set
- Front
- Back
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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 |
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What phylum do sea sponges belong to? |
Sponges are animals of the phylum Porifera. |
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What is a choanocyte, what is it for? |
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. They make up Choanoderm, a type of cell layer found in sponges. |
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What is a spicule? What is for? Where are they made? |
Some 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, though they are fairly expensive. |
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What 3 cell types make up a sponge? |
Pinacytes, Mesenchyme cells, and choanocytes. |
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What phylum are sea walnuts a member of? |
It is in a group of gelatinous animals called ‘lobate ctenophores’ because of the presence of two large oral lobes. |
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What are the comb rows in ctenophora for? |
Instead, in order to capture prey, ctenophores possess sticky cells called colloblasts. In a few species, special cilia in the mouth are used for biting gelatinous prey. |
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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. |
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What is a planula? |
a free-swimming coelenterate larva with a flattened, ciliated, solid body. |
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What is a nematocyst? Cnidocyst? |
A cnidocyte fires a structure that contains the toxin, from a characteristic subcellular organelle called a cnidocyst (also known as a cnida or nematocyst). Nematocyst is also called the "stinging organ". |
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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. |
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Differences in gastrodermis/epidermis. |
The Differences in Gastrodermis and epidermis is that the Gastrodermis is the winner layer of skin on a cell and the Epidermis is the outer layer of skin on a cell. |
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Sketch a simple drawing and identify the structures of Aurelia. |
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Sketch a simple drawing and identify the structures of a sponge. |
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