Module 9: Deuterostomes
- Page ID
- 24691
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- 9.1: Deuterostome Lab
- After this lab, you will be able to state the phyla of the organisms discussed in the lab activities, use the characteristics of symmetry, coelom, embryo tissue layers, and patterns of development to differentiate between the different organisms, and describe the general characteristics of echinoderms.
- 9.2: Reading - Echinoderms
- Echinoderms include sea stars (starfishes), sea urchins, sand dollars, sea cucumbers, and sea lilies. There are 6,000 species of echinoderms; they are all marine. Although echinoderm adults have radial symmetry, they evolved from ancestors that were bilaterally symmetrical. They have free-swimming, bilateral larvae that metamorphose (change as they mature) into adults with radial symmetry.
- 9.3: Reading - Chordates
- In this reading, you will find information about Chordates. Chordates exhibit bilateral symmetry. They have the following characteristics at some point in their life history: a dorsal, hollow nerve cord, a dorsal supporting rod called a notochord, pharyngeal clefts (pouches), and a postanal tail. In most other kinds of animals, the digestive tract extends the entire length of the animal.