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Analysis #7 - EXERCISE 1 Page 4 of 13 Group...

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EXERCISE 1 Page 4 of 13 Group Members: ___ _______________ _____________________________Exercise_______Date: ___________ LI ______________________ Unique __________ Day: __________ Room: _______ Lab Start Time ________ Group Members: _____ _______________ ___________________________________________Date: ___________ LI ______________________ Unique __________ Day: __________ Room: _______ Lab Start Time ________ Exercise 7 Analysis To be completed as a group and turned in at the beginning of your next laboratory period. Include your “Data & Results”, sketches, acquired digital images, etc. as directed by your laboratory instructor. Show your work for all calculations and/or print your MS Excel data sheets. Be sure to include proper units where necessary. Adhere to University’s Honor Code and course policies. Balance between brevity and completeness. 1. List the functions of the following external structures: a. Chelapeds = Chelapeds are shaped like claws and are used mainly for grasping objects, food, and for defense against predators. b. Walking legs = Walking legs appendages that are found on the ventral portion of the cephalothorax. The purpose of the walking legs is to allow the crayfish to crawl slowly on the bottom of streams. c. Maxillipeds = Maxillipeds are appendages that function as the mouth. In the crayfish, there are three maxillipeds; first maxilliped, second maxilliped, and third maxilliped. The third maxilliped is the longest of the three and is used to push food into the mouth of the crayfish. The first maxilliped serves as the top portion of the mouth; while the second maxilliped serves as the lower lip in a crayfish. d. Mandibles = The mandibles are jaw-like structures used primarily to grind food and make it easier to pass through the body. e. Genital pore = In the male, the sperm ducts go from the testes to the genital pore. The genital pore is located on the ventral side of the crayfish and on the cephalothorax. In female, the genitral pores are the openings of the oviducts. f. Nephridiopore = Nephridiopores are openings in which the crayfish excretes nitrogenous wastes (processed from green gland) from its body. g. Eye = The eyes serves to allow the crayfish to see. Crayfish posses compound eyes, which means that their eyes are composed of several repeating units in which each unit functions as a separate receptor. Spring 2011 Ex 7 Analysis Page 3 of 3 Spring 2011 Ex 7 Analysis Page 4 of 4
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EXERCISE 1 Page 4 of 13 Group Members: ___ _______________ _____________________________Exercise_______Date: ___________ LI ______________________ Unique __________ Day: __________ Room: _______ Lab Start Time ________ Group Members: _____ _______________ ___________________________________________Date: ___________ LI ______________________ Unique __________ Day: __________ Room: _______ Lab Start Time ________ h. Uropod/telson = Both the uropod and the telson are used for swimming. The uropod is located on both sides of the abdominal segment of the body. The telson is the seventh segment of the abdomen of the crayfish. i. Carapace/exoskeleton = The carpace is the dorsal, anterior part of the exoskeleton (hard outer covering) that is not segmented like the tail portion of the crayfish. The carpace serves to protect the internal and vulnerable organs from outside forces, i.e. predators.
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