Lab8andWriteupfor7+8.docx - Jack Stanley Section 509 Lab 7...

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Jack Stanley Section 509 Lab 7 and Lab 8 Writeup The major evolutionary changes I added in the Protostome tree begin with the sponges. Sponges have an asymmetrical body and cellular level organization. Next are the hydra, obelia, and coral, which all have radial symmetry, nematocysts, and statocysts. These 3 also have diploblastic tissues. I added the unique cells that they possess, stinging nematocysts and balance- sensing statocysts. Next up are the crawfish, spider, millipede, and grasshopper. All are arthropods with segmentation and jointed appendages. I added that all four of these organisms have bilateral symmetry, and a body plan that includes a head, abdomen, and thorax or some variation of this (cephalothorax). Next are the tapeworms, planaria, and vinegar cell who lack segmentation and a complete digestive system. However, they do have useful organ systems. After these three come the leech and earthworm. These two do have complete digestive systems and have a clitellum that allows them to secrete a sac where eggs are stored. After this come the

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