Mollusca

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Mollusca

• The mollusks

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Instructions

• Use the PowerPoint template provided to create a
  presentation on Mollusks.
• Each slide should be formatted using the pictures
  provided and the information requested in blue
  italics
• You may resize pictures, and must delete the blue
  text
• Stay within the word count specified on each
  slide.
• Each team member must choose a specific role. The
  role must change on day 2.

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Instructions

• Team member 1 find information in the hand-out
  that must be used on the appropriate slides. Some
  info will be missing. Tell team member 2 what you
  need to complete your notes
• Team member 2 Use the book to help team member 1
  fill in the missing information in the hand-out

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Instructions

• Team member 3 find a way to write the necessary
  and pertinent information down so that the copy
  meets the word limits. Remember to bullet your
  information.
• Team member 4 Place the information on the page,
  format the page, and resize and place the
  pictures.

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Defining Characteristics

• Give information on the foot, mantle, visceral
  mass no more than 25 words

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Classes of Mollusks

• Introduce these 3 classes of mollusks, their
  defining characteristic, and examples of species
  in the group Gastropods, bivalves, cephalopods
  no more than 30 words

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The mollusk foot

Where is the foot in each of these groups
Cephalopods, Bivalves, Gastropods no more than
25 words
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The Mantle

• What is the mantle and what does it do no more
  than 15 words

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The Radula

• What is the radula and how is it important for
  gastropods, bivalves, and cephalopods no more
  than 20 words

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Siphon

• What is the siphon and how is it used no more
  than 15 words

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Other Characteristics

• How are each of these unique in the mollusk?
  Nervous system, circulatory system, respiratory
  system no more than 20 words
• (the clip art below is an animation)

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Gastropods

• How do each of the following present in
  gastropods foot single shell protection no
  more than 20 words
• The snail below is an animation

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Reproduction

• What type of reproduction is used and tell
  about hermaphrodites no more than 12 words

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• Captions what are each of these?

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Slugs

• No words needed, just rearrange the pictures and
  the slide title

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Snails

• Giant African Land Snail

• No words needed, just rearrange the pictures and
  title

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(No Transcript)
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Sea Slugs

• How do they acquire and use their poison and why
  are they brightly colored? no more than 20 words
  

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Many of the slugs (including the Spanish shawl
species) feed on stinging animals, like jellyfish
and sea anemones. They are capable of keeping the
stinging cells alive in their bodies at the tips
of all those 'furry' processes, known as cerata.
Then, when a predator (like a fish) comes by for
a bite of this slug the stinging cells fire and
the fish is repelled. The predator is rarely
wounded, but it is believed that the predator
remembers the flashy colors and never again
bothers what it thought was a tasty morsel. So,
the flashy color is thus a type of 'warning
coloration.' Marine slugs also have interesting
reproductive habits. They are hermaphroditic, but
must mate with another individual. Their
reproductive pore is on the right side of their
body so they must position themselves just right.
Eventually they get together, cross-fertilize and
then separate to lay their fertilized eggs. The
eggs hatch as planktonic larvae.
There are many other beautiful nudibranchs and
a few related slugs, like Janolus barbarensis,
Hermissenda crassicornis, Triopha catalinae,
Anisodoris nobilis, Acanthodoris rhodoceras,
Diaulula sandiegensis, and Berthellina engeli.




And finally the two species I did my Master's
Degree research on, Corambe pacifica and
Doridella steinbergae, that live on the
encrusting bryozoa (white patches) on kelp and
are so camouflaged that they are nearly
impossible to see. They not only look like the
bryozoa, they eat it and lay their eggs on it.
Below is a picture of a kelp frond (about a foot
across) with these white patches and then a
close-up (about an inch across) of the white
patch with my slugs.

• caption as sea slugs only

As the water recedes during low tides there are
some fish that get trapped in the tidepools.
These are mostly small sculpins, blennies and
kelpfish, but occasionally a large fish is there,
like the cabezon. They just wait out the low
tide, that may only be an hour or two at the
lower levels, and then go about their business.
Looking up from the water a tidepooler will
almost always see numerous shorebirds, like the
snowy egret and godwits.
Occasionally there will be a seal or sea lion
hauled out on the tidepool rocks, basking in the
sun. It is especially common to see harbor seals
at the downcoast end of Carpinteria State Park,
where there is a harbor seal rookery. Each March
there are numerous babies born here - you can
observe them from the cliffs just downcoast from
the oil pier.
A unique treasure for me is the presence of my
students in the tidepools, discovering new things
and understanding the complex dynamics that
create our complicated shorelines with the four
distinct zones.

As one gets ready to leave the tidepools there
is always a chance of catching the blow of a
migrating whale. Especially from the months of
January to April, the California gray whale is
migrating to and from its breeding grounds in
Baja and passing Santa Barbara. This whale feeds
on zooplanktonic crustaceans in the Bering Sea,
off Alaska, each summer. In the fall it leaves to
travel along the coastline to Baja for its winter
mating and birthing. Then it returns north each
spring. Occasionally tidepoolers have been
surprised as they look up from the tidepools and
see a gray whale breaching nearby.

With all the thousands of possible treasures in
the tidepools, these are but a few of the visible
ones. It is the indicator species (covered
earlier in this lesson) that one can always count
on being present in the tidepools (three from the
splash zone, three from the high tide zone, one
from the mid tide zone, and three from the low
tide zone). These become like old friends to the
returning tidepooler. The 'treasures' change with
each tidepool trip - something that makes
tidepooling a unique experience each time. Enjoy
the tidepools if you ever get a chance, no matter
where you are. In California there is a State Law
that prohibits the removal of any animal from the
tidepools unless you have a permit. Permits
(fishing licenses) allow only the taking of food
items and are highly regulated. A scientific
collecting permit is required for all other
critters and these must be obtained from the
California State Department of Fish and Game only
if there is a good reason. Many other areas in
the world have similar rules so always be sure to
be knowledgeable if you must take something from
the tidepools. A good 'rule of thumb' in nature
is to leave only footprints and take only
memories and photographs.
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Conch

• No words needed just rearrange the pictures and
  title

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Gastropod External Anatomy
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Gastropod Anatomy
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Bivalves

• What is the basic anatomy and feeding strategy of
  bivalves, and what are 2 3 examples of animals
  that are bivalves? No more than 25 words

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Bivalves and Pearls

• How are pearls made? No more than 15 words

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Bivalve Anatomy
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Assignment

• Name five reasons that you would not want to be a
  bivalve (must include things we talked about in
  class)
• Name five reasons that you would want to be a
  gastropod (must include things we talked about in
  class)

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Cephalopods

• What animals are included in this group?
  Which has a shell? No more than 15 words

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Celphalopod Tentacles

• What does the foot look like and how is it used
  in cephalopods? 25 words or less

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• Cephalopods bite their prey with a beak-like
  jaw, then the radula brings it into the mouth.

• Feeding cuttlefish
  Octopus radula

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The Siphon

• How does the cephalopod move with its siphon,
  and where does ink come from and how is it used?
  20 words or less

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Types of Cephalopods

• What are the four types of cephalopods? Five words

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The Octopus

• Discuss the tentacles, the eyes, and the brain
  (intelligence) No more than 25 words

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(No Transcript)
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Squid

• Discuss the brain size, the ability to change
  color, and what calamari is No more than 20 words

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The Giant Squid

• What is it, how big does it get , what about its
  eye, how often has it been spotted in the wild?
  30 words or less

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Cuttlefish

• What is special about the cuttlefish bone? Less
  than 20 words

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Cuttlefish Anatomy
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The Chambered Nautilus

• Why is it a living fossil what is the function
  of its eyes? How many tentacles and what is their
  function? Less than 30 words.

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The Chambered Nautilus

• Talk about the nautilus shell and how it controls
  buoyancy No more than 25 words

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(No Transcript)
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Quiz 1. Name the parts
A
B
C
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2. Which of the following is not a Gastropod?

• Snail
• Clam
• Conch
• Slug

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3. Name the parts
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4. Matching
A B

• Slug
• Conch
• Sea slug
• Limpet
• Snail

C D
E
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Name the method of protection for a

• Slug
• Snail
• Sea slug

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1. Name the following
A
C
B
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2. Describe

• What a clam uses to anchor in the soil
• The part of the scallop that creates the shell
• How a pearl is made
• What the visceral mass is
• How a bivalve eats

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3. What is this?

• A B
  C
• D E