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STATIONS OF POLITICALLY
ACCURATE MOLLUSCS (SPAM)
STATIONS 1: Snails, snails, SNAILS!
Class Gastropoda
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Snails are divided into two groups: aquatic snails and land snails. Each division possess a different type
of respiration. This division arose after the evolutionary origination of the land snail species, which
promoted some snails to acquire the adaptation of lungs in the mantle or blood vessels lining the mantle.
TASK 1:
Observe the live snails and the snail anatomy diagram. Label the required structures on the diagram
below. (3 marks)
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Eye
Mouth
Cerebral Ganglia
Crop
Foot
Heart
Gill
Anus
Digestive Gland
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TASK 2:
Read the excerpt from the article, “Adaptations That Made Terrestrial Life Possible” and discuss with
your group the development of lungs in snails. Then, answer the following questions.
1. Looking at the diagram above, identify if it is a land snail or aquatic snail. Which body structure
helped you make your choice and what is the function of that body structure? (3 marks)
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2. What type of habitat must snails with lungs reside in? What about the habitats of snails with
gills? How does the habitates differ and how are they similar? Use the Venn Diagram (3 marks)
3. If most snails have lungs and not gills, why do land snails still prefer moist, humid
environments? (3 marks)
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STATIONS OF POLITICALLY
ACCURATE MOLLUSCS (SPAM)
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STATIONS 2: Clammy CLAMS!
Class Bivalvia
Clams are marine bivalves that burrow into the sediments of the ocean floor. The word bivalve refers to
the two shells that form the outer shell of a clam that is hinged together by a powerful muscle. They
produce their shells out of the minerals in the water that surrounds them.
TASK 1:
Observe the clams and the clam anatomy diagram. Label the required structures on the diagram below.
(3 marks)
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‣ Heart
‣ Anus
‣ Stomach
‣ Excurrent/
Incurrent Siphon
‣ Gill
‣ Mantle
‣ Foot
‣ Intestine
‣ Ganglion
TASK 2:
Read the excerpt from the article, “How Do Clams Produce Their Shells” and discuss with your group
the development of shells in clams. Then, answer the following questions.
1. Looking at the diagram above, identify the specific structure that holds the shells together. Where
is this structure located in the clam? What other shell-specific function does this location of the
clam have? (3 marks)
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2. What is the shell of a clam composed of? How is this mineral collected and how is it produced
into shells? (3 marks)
3. What is the function of the shells of clams? How do you think some predators feed on clams if
the shells are in the way? (Textbook: p.587) (3 marks)
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STATIONS OF POLITICALLY
ACCURATE MOLLUSCS (SPAM)
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STATIONS 3: Occupy OCTOPI!
Class Cephalopoda
Cephalopods, comprising of cuttlefish, squids, and octopi, exhibit remarkable intelligence. Though it has
been argued otherwise and highly debated, it is accepted that cephalopods display spatial learning
capacity, navigational abilities, communication skills and predatory techniques.
TASK 1:
Observe the octopus and the octopus anatomy diagram. Label the required structures on the diagram
below. (3 marks)
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Beak
Siphon
Brain
Crop
Mantle Cavity
Stomach
Hearts
Ink Sac
Anus
TASK 2:
Read the excerpt from the article, “Intelligent Cephalopods: Octopus, Squid and Cuttlefish” and discuss
with your group the intelligence of cephalopods. Then, answer the following questions.
1. Name three reasons why cephalopods are believed to be intelligent? Give a short 1 sentence
summary of each reason. (3 marks)
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2. Compare the brain of the octopus with the “brain” or ganglion of bivalves and gastropods. How
does the size of the brain compare? How does the size fo the brain indicate intelligence? (3
marks)
3. Compare and contrast the structures of a squid, an octopus and a cuttlefish? (Use the Venn
Diagram) (3 marks)
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STATIONS OF POLITICALLY
ACCURATE MOLLUSCS (SPAM)
STATIONS 4: Magnificent MOLLUSCA?
Phylum Mollusca
There are over 100,000 species of mollusks, all varying in size, habitat, form, and color. Animals
classifed under one phylum are usually based on shared features. Most mollusks have a special kind of
larvae called a trochophore, and all mollusks are soft-bodied with an internal or external shell.
TASK:
Use the Venn Diagram below to compare the Phylum Mollusca, and Phylum Annelida. It is believed that
because Annelids also develop into trochophore larvae, annelids and mollusks evolved from a common
ancestor that existed during the Precambrian Period. Compare not only their early developmental stages,
but also their structures and functions. (12 marks)