Lab 09_Mollusks and Arthropods

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BSC 1011L LAB #9 – ANIMALS #3: MOLLUSKS AND ARTHROPODS 9-1

BSC 1011L LAB #9 – ANIMALS #3: MOLLUSKS AND ARTHROPODS 9-2 Name: Indranie Sarju LAB #9 – ANIMALS #3: MOLLUSKS AND ARTHROPODS LAB REPORT SECTION EXERCISE 9.1: CLASS GASTROPODA – SNAILS In the space provided below, sketch examples of gastropods you viewed with the naked eye and label their names. EXERCISE 9.2: CLASS BIVALVIA - BIVALVES In the space provided below, sketch examples of bivalves you viewed with the naked eye and label their names.

BSC 1011L LAB #9 – ANIMALS #3: MOLLUSKS AND ARTHROPODS 9-3 EXERCISE 9.3: CLASS CEPHALOPODA – SQUID Compare and contrast the shells of the nautilus, cuttlefish, squid, and octopus in the Table below. You need not precisely weigh and measure the shells; simply use descriptive terms and base your comparisons on your subjective visual and tactile perceptions. Shell Weight Shell Thickness Shell Flexibility Other Descriptions Nautilus thin Not flexible Spiral shapes Multiple rooms One large opening Cuttlefish Very thick no Cuttlebone White Oblong Squid Very thin Not flexible Pen Long Cylindrical Octopus No shell No shell No shell In the space provided below, sketch examples of cephalopods you viewed with the naked eye and label their names.

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BSC 1011L LAB #9 – ANIMALS #3: MOLLUSKS AND ARTHROPODS 9-4 EXERCISE 9.4: SUBPHYLUM TRILOBITA https://www.uwlax.edu/biology/zoo-lab/lab-8--arthropods/ In the space provided below, sketch an example of a fossil trilobite as viewed with the naked eye and label the cephalon, thorax, pygidium, and compound eyes. EXERCISE 9.6: SUBPHYLUM CHELICERATA, CLASS ARACHNIDA Sketch a walking leg of the spider in the space provided below and label the coxa, trochanter, femur, patella, tibia, metatarsus, and tarsus. Spider Honeybee leg, 40X EXERCISE 9.7: SUBPHYLUM CRUSTACEA Describe the joint motion of the crayfish cheliped (first walking leg). Compare and contrast the range of motion to that of your own wrist. Chelipeds are the forelimbs that are present apart from walking legs. They are present to catch and attract the prey and are used in defense mechanism of the cray fish. Humans use fingers to catch and hold the objects . similarly cray fish uses chelipeds to hold the prey. Palm connects fingers and wrist in humans . Similarly, there is a region palm of propodus that connects the fixed fingers of propodus and movable finger of propodus called dactyl with copepodite region. Describe how the leg structure of the crayfish is modified to compensate for the limited motion of a single joint.

BSC 1011L LAB #9 – ANIMALS #3: MOLLUSKS AND ARTHROPODS 9-5 EXERCISE 9.8: SUBPHYLUM UNIRAMIA. (From video of grasshopper dissection.) Describe the structural differences between the forewing and hindwing of the grasshopper. Which wing is most important for flight? What purpose might be served by having leathery forewings? Fore wing and hindwing are present in grasshopper. Fore wing is used for protection, and they are thick and tough. Hind wings are thin, and they are for flying . They are present inner to the fore wing. The wings are for flying and making noise. The leathery front wings are to protect the hind wings as they are thick. Draw the hind leg of the grasshopper in the space provided below and label the segments. Include the coxa, trochanter, femur, tibia, metatarsus, tarsi, and claws What is the sex of your grasshopper specimen? Female Describe how you think the honeybee uses its antennae cleaner. https://www.honeybeesuite.com/a-quick-start-guide-to-honey- bee-antennae/ To use the antenna cleaner, the bee raises her foreleg over her antenna and then flexes her tarsus. This action allows the spur to close the notch and form a ring around the antenna.

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