Station 1: Phylum Mollusca Class Gastropoda “STOMACH FOOT” Gastropods can live in freshwater, marine, and land environments. Directions: 1.) Observe the snail! What does it look like? What parts are soft or hard? TOUCH IT WITH YOUR FINGER! 2.) These snails and slugs move by producing MUCUS that allows the snail or slug to travel over any surface. These organisms also use their muscular foot to help propel them. 3.) Find the RADULA on the snail or snail diagram. This part of the snail is used to scrape their food off of rocks or other places. 4.) Draw a picture of the snail at your lab station. 5.) Watch the video of a snail moving across a surface, notice the mucus!! Station 2: Phylum Mollusca Class Cephalopoda “HEAD FOOT” 1.) Observe the squid and octopus! What does it look like?? TOUCH IT WITH YOUR FINGER! 2.) Draw a picture of the squid or octopus at your lab station. 3.) Can you locate the arms and tentacles of the squid? ***Think about the role of the arms and tentacles that are used for eating/killing.*** 4.) Cephalopods move by JET PROPULSION. This means the squid will shoot out water through a siphon (can you find the siphon on the squid???) to allow the squid to move in the opposite direction. *** Think about it, this way. String a fishing line through a straw, and attach a filled balloon to the straw. Which way would the air out of the balloon go? Which way would the straw move?***. 5.) Squids have a unique adaptation where they can “INK” an area. To help avoid predators, the squid has an ink sac that is filled with ink. When a squid is in immediate danger, the squid will expel the ink, leaving a dark cloud in the water, allowing the squid extra time to escape. Station 3: Phylum Mollusca Class Bivalvia “ TWO SHELLS” Directions: 1.) Observe the scallops, clams, oysters! What does it look like?? TOUCH IT WITH YOUR FINGER! 2.) Draw a picture of these organisms at your lab station. 3.) These organisms have two shells that are held together by powerful muscles. 4.) Usually most bivalves are stationary, however, the scallop is able to clap their shells together and swim! Others can use their muscular foot to move within their stationary location. 5.) The muscular foot allows the clams, oysters, scallops, to anchor into the ground, which ensures the space or habitat for the bivalve. 6.)Unlike the Gastropods, these organisms do not have a radula. Bivalves are FILTER FEEDERS! These creatures can catch really small organisms as they pass through the clam. (Think of a coffee filter – The water goes through the filter, but the coffee grounds do not – These coffee grounds would be representative of its food!) 7.) Everyone knows that pearls are inside of a Bivalve, but HOW ARE THEY MADE?? A grain of sand will get stuck in between the muscular foot and the shell. The bivalve will secrete a shiny substance that will over time build up on the sand grain. After a few years, the sand grain with the shiny secretions is a PEARL! Station 4: Phylum Echinodermata “SPINY SKIN” Directions: 1.) Observe the specimens! What does it look like?? TOUCH IT WITH YOUR FINGER! 2.) Draw a picture of the sea star or sea urchin at your lab station. The ORAL side of an organism is the side with the MOUTH. The ABORAL side of an organism is the opposite side of the mouth! 3.) CHANGE QUESTION 1 – This question should read: HOW DO SEA STARS REGENERATE? Sea stars are able to regrow lost limbs. Can we do this? 4.) Most echinoderms are carnivores, meaning they eat animals. 5.) As you will see in the Live Station, Sea urchins and sea stars have TUBE FEET that allow them to move. These tube feet are like suction cups. 6.)The TUBE FEET that help the sea star move are a part of the WATER VASCULAR SYSTEM (disregard the blank in your packet) that moves food, water, and removes wastes. Station 5: Phylum Echinodermata “SPINY SKIN” Directions: 1.) Observe the specimens! What does it look like?? TOUCH IT WITH YOUR FINGER! 2.) These organisms DO NOT have tube feet; therefore, the brittle star moves by physically moving its limbs, and the sand dollar uses its spines to dig into the ocean floor. 3.) Watch the videos of how these organisms move in their environment! 4.) Remember, these organisms show RADIAL symmetry. They produce mirror images when cut in any direction (Like the spokes on a bicycle wheel). 5.) Echinoderms can regenerate lost limbs! If they lose a limb for some reason, the animal (though very costly) can regrow that particular limb!