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12 Cards in this Set
- Front
- Back
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What are the five classes of cnidarians and their identifying characteristics? |
Anthozoa- Sea and Corals and medusas. Hydrozoa- Hydra, portuguesa man o war, Scyphozoa- Jellyfish Cubozoa- box jellies Staurazoa-star jellies Characteristics-radically symmetrical, multicellular, few tissues, same organelles, contains internal cavity, 2 different forms, medusa and polyp, reproduction is a sexual or sexual. Has a net like nervous system. |
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What phylum do sea sponges belong too? |
Porifera |
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What is a choanocyte, what is it for? |
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? |
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? |
Choanocytes (also known as "collar cells"), flagellated cells which function as the sponge's digestive system, are remarkably similar to the protistan choanoflagellates. The collars are composed of microvilli and are used to filter particles out of the water. |
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What phylum are sea walnuts a member of? |
ctenophora |
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What are the comb rows in ctenophora for? |
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? |
Cnidocyte is also called the "stinging cell". Cnidae are used for prey capture and defense from predators. 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. |
They are both tissue layers found in cnidarians. Single layer of cells. Epidermis is the outer lining of a cnidaria gastrodurmis is the inner lining of the gastrovascular cavity. |
