Phylum Mollusca. clams, snails, slugs, and octopuses. What is a mollusck?. Slugs, snails, squids, and some animals that live in shells in the ocean or on the beach. Live in the ocean, freshwater, and moist terrestrial habitats.
clams, snails, slugs, and octopuses
Digestive tract with two openings
Mantle (MAN tuhl) - membrane that surrounds the internal organs of the mollusk. In shelled mollusks, the mantle secretes the shell.
Octopuses and squids are predators that use their radulas to tear up the food that they capture with their tentacles.
In fact, cephalopods are considered the smartest of all invertebrates!
In most mollusks, the heart pumps blood through an open circulatory system.
Three mollusk classes
Snails, abalones, conches, periwinkles, whelks, limpets, cowries, and cones.
Sea slugs feed on jellyfishes and incorporate the poisonous nematocysts into their own tissues without causing these cells to discharge.
Direction of squid
Cephalopods also use chromatophores to camoflague themselves. Can you see the octopus in this video?
Cephalopods have been known to break out of aquariums in search of food and board fishing boats and open holds to eat crabs.
In the UK they are considered “honorary vertebrates” and are protected by animal cruelty legislation.
In some countries they are on the list of experimental animals that cannot be operated on without anesthesia.