FA16_Student_Intro_to_Inverst Lab Sheet-1

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Northeastern University *

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Apr 3, 2024

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Introduction to Invertebrates Lab Sheet Name _____________________________________________________ SECTION_____ TAs NAME________________________________________________ Chapter 23.1 Evolution of Animals Over the next labs you will learn about a variety of different animals. Throughout that time you will complete charts to observe the evolutionary relationships between all of these taxa. Use the information from today’s lab to complete the first chart below. Phylum Name Tissue Layers Body Cavity Symmetry Protostome or Deuterostome?

Chapter 23.2 Sponges Examine the preserved sponge cut in half. Locate the osculum and the central cavity. Draw and label them below. Examine a prepared slide of Grantia . Label the following: Magnification Central cavity osculum pore spicule (if visible)

Use a prepared slide of sponge spicules to draw them below: Name an example of each type of sponge that you observed in lab. Draw the specimen and write what type of spicules they have. Specimen Name_________________________________________ Spicule type_____________________ Specimen Name_________________________________________ Spicule type_____________________ Specimen Name_________________________________________ Spicule type_____________________ Chapter 23.3 Cnidarians Use a prepared Whole Mount (W.M) slide of Hydra to draw and label the following: Magnification

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Tentacle Mouth Epidermis Basal Disk View a living hydra demo set up by your TA. Describe how the Hydra move. View a hydra feeding demo set up by your TA. Describe how a Hydra collects and ingests it’s food. View the preserved specimens of Cnidaria available. You should be able to identify these organisms to the level of Genus. Draw and label them below.

Chapter 23.4 Flatworms Examine the whole mount (W.M.) of the Planaria ( Dugesia ) and draw and label the following: Magnification, Eyespots, Auricle, Pharynx Examine the cross section (x.s.) of the Planaria ( Dugesia ) and label the following: Magnification, Pharynx, Buccal Cavity, Epidermis

View the living Planaria in a dish under a dissection scope. Describe how it moves. If there is food present, describe how the Planaria ingests food. Examine the prepared slide of the Tapeworm ( Taenia ). The slide has four regions of the tapeworm. What are the sections of the tapeworm called? ________________________________ Draw the scolex and label the following structures: Magnification, hooks, suckers Draw a mature proglottid and label the following structures: Magnification, uterus, testis, vas deferens, genital pore, oviduct, ovary

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Examine the preserved slide of the Clonorchis sinensis . Draw and label the following: Magnification, Oral Sucker, Ventral Sucker, Uterus, Testis What disease does this organism cause? ___________________________________ Perform a dissection of an Ascaris worm. You should only dissect the female but be able to identify the structural differences between the male and the female. Draw and label the following: intestine, vagina, uterus, oviduct, ovary

Examine a prepared slide of Trichinella . Draw and label the following: Magnification, Muscle, Trichinella cyst

What disease does this organism cause? ___________________________________ How can infection be prevented? _________________________________________________________ View the live vinegar eels prepared by your TA. How do they move? _______________________________________________________________ Why do they move this way? _______________________________________________________________ Chapter 23.6 Rotifers Observe a prepared slide of Rotifera . Draw and label the following: Magnification, corona, stomach, foot Observe the live rotifer demo your TA has set up.

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What structure is moving the most? _________________________________ List one function of this structure. _______________________________________________

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