Phylum: Mollusks. Three Classes of Mollusks. Class Gastropoda – snails, slugs Class Bivalvia – clams, oysters, mussels, scallops Class Cephalopoda – octopi, squids and cuttlefishes. Basic information. Over 100,000 living species Marine, fresh water, and land Most Bilateral symmetry.
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Other Bivalvia: scallops, mussels, oysters
1. Cilia in gills set up water current
2. Gills filter water for small organisms
3. Palps: flaplike structures that surround & guide food into the clam's mouth
4. Food then enters the mouth
4. Stomach: Digestion begins
5. Digestive glands: digested particles are absorbed
6. Intestines: collects and removes digestive wastes
7. Waste are passed through the rectum and excreted through anus
Squid Suction Cups
Squid suction cups are armed with hooks or sucker rings (or a combination of
the two). Octopus have simple suction cups without secondary armature.
Tentacle club of Architeuthis, showing circular-saw-like sucker rings.
tentacle club of Mesonychoteuthis, with swiveling hooks.
Suction cups of Haliphron atlanticus, the giant gelatinous octopus (the world's largest species of octopus), lacking secondary armature.
Can reach length of up to 60 feet and weight of more than 3.5 tons.
*Also uses siphon
The Blue Ringed Octopus (found in shallow coral and rock pools of Australia): It’s poisonous saliva is 10,000 more potent than cyanide. This octopus is only the size of a golf ball but carries enough poison to kill 26 humans in minutes.
Fish, other mollusks, crustaceans, worms
Beak like jaws and radula tear prey into pieces
Octopus and Cuttlefish have poison in saliva