http://www.google.com/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&docid=dtMnpUK_mm2IpM&tbnid=DnN7nf1ziGwB8M:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.poptower.com%2Fgary-snail-spongebob-picture-14604.htm&ei=ZJ8_UaznO4SvqgGvg4DQAg&bvm=bv.43287494,d.aWc&psig=AFQjCNEJN5n82SQ_GXgFE7cPgNtpmBCekQ&ust=1363210454498634

Ancestral Protist

segmentation

true tissue

radial symmetry

bilateral symmetry

Deuterostomes:eucoelom

Protostome: schizocoelem

pseudocoelom

Porifera

Cnideria

Platyhelminthes

Nematoda

Mollusca

AnnelidaEchinodermata

ChordataArthropoda

no true tissues

acoelom

Phylum Mollusca

Class Polyplacophora

Class Gastropoda

Class Bivalvia

Class Cephalopoda

More than 500,000 known species

chitons SnailsSea slugsnudibranchs

clams SquidOctopusCuttlefishNautilus

Class Scaphopoda

Tusk shells

http://www.google.com/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&docid=oQSqq6a1BEioUM&tbnid=BHW2FAT1qYkeHM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.britannica.com.ph%2Fzoology%2Fmollusk-372416.html&ei=6J0_Uc3GLo-vqQGmnIF4&bvm=bv.43287494,d.aWc&psig=AFQjCNHqF-OUHuAFrwZkq0RKnQ11I9UUOQ&ust=1363209997565550

Three main parts:

• Muscular foot- for movement• Visceral mass- contains most of the

internal organs

• Mantle cavity- houses gills

mantle

foot

visceral mass

• Grazers (radula- scraping tongue)

• Filter feeding

• Egg eaters

• Active predation

Kingdom AnimaliaPhylum Mollusca

Class Polyplacophora chiton

Class Polyplacophora chiton

Class Scaphopoda tusk shell

Class Scaphopoda tusk shell

Spanish Dancer (nudibranch) & egg mass

Class GastropodaSubclass Opisthobranchia

nudibranchsPhistella

nudibranchsPhistella

Phylum MolluscaClass Gastropoda

nudibranchsnudibranchs

Nembrotha kubaryana

Cuthona sp.

Chromodoris annae Halgerda batangas

Chromodoris

nudibranchsnudibranchs

Cowery

Opihiperiwinkle

Class Gastropoda

Cone snail

EpitomiumEpitomium

Triton’s trumpetTriton’s trumpet

pterapods

Class Bivalvia

Class Cephalopoda

Squid

Class Cephalopoda

http://www.youtube.com/watch?v=U2s3C0lkQE0

http://www.youtube.com/watch?v=NR53smpV_xg

Class Cephalopoda

Flamboyant cuttlefish

Class Cephalopoda

nautilus

Class Cephalopoda

octopus

Octopus Intelligence

http://www.youtube.com/watch?v=GQwJXvlTWDw

Start at 2 minutes

flatfish

lionfish

Sea snake

Mimic octopus from Indonesia

http://www.youtube.com/watch?v=H8oQBYw6xxc

Dumbo

Vampire

Coconut

Amphioctopus marginatus

                                     

Blue-ringed octopus

Highly venomous