Molluscs
BUT FIRST:
Don’t forget Annelids!
HTTP://VIDEO.ABOUT.COM/HERBGARDENS/
WORM-COMPOST-BIN.HTM
DID YOU KNOW YOU CAN MAKE
YOUR OWN COMPOST BIN AT HOME
FOR YOUR VEGETABLE SCRAPS?
Molluscs
“MOL”: “SOFT” (IN FRENCH)
MOLLUSC: SOFT-BODIED ANIMAL
Molluscs or Mollusks?
 BOTH are right BUT….
Phylum Mollusca
(not Molluska)
What are some examples of molluscs?
GIANT CLAM
GIANT PACIFIC OCTOPUS
SCALLOP
LAND SNAIL
What are some COOL examples of molluscs?
http://blog.ted.com/2008/01/11/david_gallo/
(Start at 1:50)
Molluscs have…
 a mantle
 a soft body
 visceral mass
 soft, muscular foot
 most have external shells (many have internal shells)
 SOME have…
 a radula
 trocophore larvae
 siphons
The Many Faces of a Mollusc
Mollusc forms vary, but contain all the same elements.
Different Body Parts on Molluscs: Foot
http://www.youtube.com/watch?v=_KVFDfv6R2M
VAMPIRE
SQUID
GEODUCK
(pronounced:
goo-ey-duck)
WHITE-LINED
DIRONA
NUDIBRANCH
LAND
SNAIL
Different Body Parts on Molluscs: Shell
http://www.youtube.com/watch?v=949eYdEz3Es
NAUTILUS
GIANT CLAM
ABALONE
Different Body Parts on Molluscs: Radula
MARGARITA SNAIL
http://www.youtube.com/watch?v=mLVDwlrSq5U
Different Body Parts on Molluscs: Siphons
CLAM
OCTOPUS
Molluscs and Our Ecology
Bivalves are filter feeders.
They end up accumulating lots of toxins!
Be careful when choosing which ones you eat!
Molluscs and Our Ecology
Zebra Mussels
Classes of Molluscs
 3 classes of molluscs we will be examining:
 Gastropods
(Gastropoda)
 Cephalopods
 Bivalves
(Cephalopoda)
(Bivalvia)
Classes of Molluscs: Gastropods
GASTRO = STOMACH; POD = FOOT
Classes of Molluscs: Cephalopods
CEPHALO = HEAD; POD = FOOT
Classes of Molluscs: Bivalves
BI = TWO; VALVE = SHELL
Your Way vs. Science’s Way
Add on to your notes the answers to these questions:
 Was your way of classifying molluscs into three
groups similar or different to the way that scientists
do it?
 In what ways are they similar or different?