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5 Cards in this Set
- Front
- Back
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List and describe the 6 criteria used to classify animals.
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The main criteria are organization of tissues, type of symmetry, type of body plan, type of coelem, and presence or absence of segmentation.
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The traditional phylogentic tree utilizes what two types of data to determine which phyla are most closely related to one another?
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Phylogenetic trees have been based on anatomical or embryological data.
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Explain what features make Porifera unique to the animal kingdom.
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Porifera or sponges are the only animals that lack true tissues and have only the cellular level of organization. Porifera are believed to be an evolutionary dead end.
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Describe the functions of the cells found in a sponge.
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The outer layer cells are flattened epidermal cells, which help the sponge expand and contract. The middle layer of cells contains amoebocytes in a semifluid layer matrix and is important in digesting and transporting the nutrients from cell to cell. The inner layer of collar cells which help produce water currents which helps force the water through the pores.
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Explain how the two Cnidarian body forms differ and what role each plays in its lifecycle.
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The two body forms of Cnidarians are polyps, which has a mouth that is directed upwards, and a medusa, which has a downward directed mouth. The polyp stage produces the medusa stage by asexual budding. The medusa stage reproduces by by producing egg and sperm.
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