Zablocki 2013 Mollusks

Mollusks: TYPES Snails Clams Mussels Squid Octopus

Mollusks: Body Structure 1) Head: nervous organs 2) Visceral mass: internal organs 3) Foot: helps move the animal 4) Usually have a shell (some do not) 5) Mantle: secretes shell 6) Radula: mouth 7) Gills: breathing 8) INVERTEBRATES!!!!

There are seven classes of mollusks: Animal Kingdom Phylum Mollusca CLASSES: 1) GASTROPODA 2)POLYPLACOPHORA 3)BIVALVIA 4)CEPHALAPODA 5-7) Monoplacophora, Aplacophora, Scaphapoda (VERY RARE) Kingdom Phylum Class Order Family Genus Species

CLASS:GASTROPODS SNAILS LIMPETS ABALONES (ALL HAVE A SHELL) Slugs Nudibranches (NO SHELL)

CLASS: POLYPLACOPHORA Means “many plated” Called Chitons Look like “pill bugs” Eat algae found on rocks Slow moving, these creatures many not move more than 10 ft in a year!

CLASS:BIVALVIA Means two shells Well known because they are a common food source. Clams, mussels, oysters, scallops. Marine/Freshwater Filter Feeders

How is a pearl formed? Pearls are made by clams, oysters, and mussels. A grain of sand or other small irritant gets painfully stuck in the mantle of the creature. The animal coats the irritant with the same material to make the shell. This makes the irritant smooth and less painful.

Class Cephalopoda: Free swimming Squid, Octopods, Cuttlefish, Nautilises Feet are confused with tentacles. Don’t generally have shells. Most well developed nervous systems and eyes. Have a beak

Octopods: Two eyes Round head Four pairs of arms (suction cups) Hard beak Most intelligent of the invertebrates Expel ink Camoflauge Live in dens on the sea floor

Octopus

Squid Strong swimmers Eight arms arranged in pairs Two tentacles Two fins on their head Live in open ocean

Squid

Cuttlefish

Nautilus

Inside Nature’s Giants: SQUID