Meet the mollusks & arthropods

Meet the Mollusks & Arthropoda

Kingdom Animalia!

Phylum Mollusca

• 2nd largest phylum; more advanced than the last 3

• 3 Classes we’ll cover:A) Gastropods – “stomachs with feet”

B) Bivalves – “2 shells”

C) Cephalopods – “heads with feet”

A) Class Gastropoda• The Snails &

Nudibranchs!– Some (snails) make

their own shell– Snails move using a

foot– Snails have an

operculum – “Trap Door” slams shut to protect snail inside

– Nudibranchs = shell-less snails

Nudibranch: http://www.youtube.com/watch?v=FysyIFFNXl8&NR=1&feature=fvwp

Snail: http://www.youtube.com/watch?v=BMOSvz5mThM

B) Class Cephalopoda

• The Squid and Octopus!– Most evolved

mollusks– Have beaks and

tentacles– Ink– Squids are largest

invertebrate, but octopus are the most intelligent

Octopus smart & flexible!

• http://animal.discovery.com/videos/fooled-by-nature-intelligent-octopuses.html

C) Class Bivalvia

• The Clams, mussels, scallops – oh my!– 2 shells– Most use foot to move, but scallops swim!

http://video.google.com/videoplay?docid=-5451171616065371182&q=swimming+scallop&total=30&start=0&num=10&so=0&type=search&plindex=6

Phylum Arthropoda

• Still Kingdom Animalia!

• Two Subphyla We’ll Cover: A) Subphylum Chelicerata – Sea Spiders &

Horseshoe Crabs

B) Subphylum Crustacea – Lobsters, Crabs,

Shrimp, for example

The only “attached” crustacean

Can you name them?

1. Subphylum Chelicerataa. Sea Spiders and b. Horseshoe Crabs

Like all Arthropods, they have no bones and grow by molting!

a. Class Pycnogonida(sea spiders-yipes!)

b. Class Merostomata

Horseshoe Crabs are True Blue Blooded

Creatures

We have ____________________ to make our blood red

Many crustaceans have hemocyanin, making their blood blue!

http://www.youtube.com/watch?v=e8KlAmtIu1E

Male Horseshoe

Crabs Have

Modified Front Legs That Look

Like Boxing

Gloves or Baseball Mitts to

Help Hold onto the Female During Mating

http://horseshoe-crabs.com/Horseshoe_crab_anatomy_video.html

2. Subphylum – Crustacea – Lobsters, Crabs, and Shrimp – oh my!

More Crustaceans:the sea insects

Scuds, Beach Hoppers, Beach Fleas, and Skeleton Shrimp:

The Amphipods

Still that familiar meroplanktonic

larvae we know and love! Special Name:

Zoea

Still No Skeleton – Molting Instead

The Smallest, Most Abundant Crustacean in the World’s

Oceans:

The Little Copepod

??What’s the largest Crustacean??

Are You “CooCoo” for Copepods?

Krill Kill Memory Jogger – why is this Crustacean Arthropod

sad ?

“Help me!. . . . .I have no ice left to live in!”. . . . “My world is melting!. . . What am

I supposed to eat?”. . . Where are all these jellyfish coming from?. . .

What’s Going On Here????

http://www.youtube.com/watch?v=yMxY4c5SeIs

http://news.nationalgeographic.com/news/2006/09/060921-krill-video.html

http://library.thinkquest.org/J001418/what.html

Which Numbers Belong To Which Phyla?

(Try the rest for a good review before the unit test!)

References (on our class website)

• http://www.dnr.state.md.us/baygame/bbc_molting.asp

• http://www.k12.de.us/warner/structure.html