Module 8: Invertebrate II
- Page ID
- 24683
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- 8.1: Invertebrate Lab II
- 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 invertebrate groups, and Perform a chi-square analysis and determine if the results from the bean beetle experiment are statistically significant by using the degrees of freedom and the p-value.
- 8.2: Reading - Flatworms
- Flatworms are flattened and have bilateral symmetry. They are triploblastic (have 3 embryonic tissue layers: ectoderm, mesoderm, and endoderm) and therefore have organ-level of organization. There is no body cavity, so they are acoelomate. Flatworms have a gastrovascular cavity with one opening (a sac-like gut). In this reading, you will also find pictures of different types of flatworms as well as their body structures.
- 8.3: Reading - Mollusks
- All mollusks have a visceral mass, a mantle, and a foot. The visceral mass contains the digestive, excretory, and reproductive organs. The mantle is a covering. It may secrete a shell. The foot is muscular and is used for locomotion, attachment, and/or food capture. In this reading, you will find figures and descriptions of several animals belonging in the phylum Mollusca.
- 8.4: Reading - Annelids
- In this reading, you will find figures and descriptions of animals belonging in the phylum Annelida. Segmented animals have repeating units. This has led to specialization of parts over evolutionary time because the different segments could become specialized for different purposes. Molecular data suggest that segmentation evolved independently in the annelids, the arthropods, and the chordates because ancestors to each of these three groups were not segmented.
- 8.5: Natal Bean Discrimination by Bean Beetles
- Bean beetles are herbivorous pest insects that are found in Africa and Asia. Females lay their eggs on the surface of beans. Females will choose the best substrate (bean) to lay their offspring on since the larvae cannot move. This is a critical choice for the females since they can lay eggs on a wide range of bean species but very few bean species will result in normal development and the successful emergence of adults.