Lab 5 Flashcards
Briefly describe Class Gastropoda of the phylum Mollusca
Largest and most successful mollusc class. The body of gastropods twist counterclockwise during development in a process called torsion. One side of the body usually has reduced or completely lost organs because of this process.
What is the phylum, class, and genus of this organism? What is the common name for this species?
Name the labelled structures.
Where is the gill located?
Phylum - Mollusca
Class - Gastropoda
Genus -Busycon
Common name is Atlantic whelk.
A - Head
B - Foot
C - Mantle
D - Visceral mass (note torsion)
E - Siphon
The gill is located just past the siphon
What organism is this the shell of? What is the advantage of the asymmetric spiral shell? Is this shell sinistral or dextral?
The shell of Busycon spp. Scientists have no idea what the advantage is. Mostly it just causes wastes to be dumped on the Gastropod’s head.
This shell is dextral, because the opening is on the right hand side
What is the phylum, class and genus of this organism? Name the structures indicated. What is the purpose of structure “A”?
Phylum - Mollusca
Class - Gastropoda
Genus - Busycon
A - Operculum: rigid disk of protein used to seal the shell aperture when the foot is withdrawn
B - Siphon
Name the phylum, class, and genus of this organism. What is the common name of this organism? Name the structure indicated by the pointer. What is the purpose of it? Where is the shell located? Where are the eyes located?
PHylum - Mollusca
Class - Gastropoda
Genus - Agriolimax
Called the pneumostome, functions to allow water to flow into and out of lung.
Shell is located inside the organism. The head and tentacles are also deep inside
What is the phylum, class, genus and species of this organism?
Phylum - Mollusca
Class - Gastropoda
Genus - Helix
Species - pomatia
What is the phylum, class, and genus of this organism?
Name the structures indicated.
How are the two valves attached to each other?
Phylum - Mollusca
Class - Bivalvia
Genus - Anodonta
A - Mantle pulled back
B - Gills
C - Foot
D - Labial palps
E - Mantle
Valves are attached by adductor muscles and a ligament.
Name the structures on this freshwater clam shell.
What are advantages and disadvantages of clams having such a large shell?
A - Pallial line
B - Adductor muscle insertion
C - Lateral teeth
Advantage - Water circulation
Disadvantage - Movement is hard
What structural adaptation does the clam use to burrow? What is the purpose of the gills?
Uses large muscular foot to dig.
Gills are used to filter food particles as well
To what phylum and class does this organism belong? Describe the basic chracteristics of this class
Phylum - Mollusca
Class - Bivalvia
Head is greatly reduced (usually represented by two labial palps on either side of the mouth), foot and visceral mass are laterally compressed, shell is composed of two halves
What the heck is this? What purpose does this serve?
Clam glochidium larvae. They are beneficial to the calm because it allows lots of babies to be released.
What is this and what is its function?
Snail radula, functions in scraping food
What is the phylum and class of this organism? Describe the basic characteristics of this class
Phylum - Mollusca
Class - Cephalopoda
Elongated dorso-ventrally. Foot is drawn out into arms and tentacles, May have an internal shell that is greatly reduced. Circulatory system is closed in the form of arteries, veins, etc.
What is the phylum, class and genus of this species?
Does this organism have a shell?
Phylum - Mollusca
Class - Cephalopoda
Genus - Octopus
No shell at all, not even internal
What is the phylum, class, and genus of this organism?
How is this organism adapted for swimming?
Phylum - Mollusca
Class - Cephalopoda
Genus - Sepia
Fin fringe along outer body wall used from swimming. They can also quickly shoot water out of their siphon, using propulsion to swim away
What is seen in this photo? What is the purpose of this structure?
Cuttlebone of Sepia spp. It is hollow and full of air to aid in buoyancy.
What is the phylum, class, and genus of this organism?
Name the indicated structures. What functional purpose does A serve? How are B and C adapted for food capture? Why is the mantle of this organism so thick?
Phylum - Mollusca
Class - Cephalopoda
Genus - Loligo
A - Pen supports the mantle and serves as a site for muscle attachment
B - Tentacle
C - Arm
Tentacles and arms are modified so arms have suckers and long tentacles can wrap around prey.
Mantle is so thick because of muscles lining it. The muscles are necessary for locomotion (propulsion).
What is the phylum, class, and genus of this organism?
Name the structures highlighted. Describe structures 5, 9, 10.
How is the circulatory system adapted for its active life cycle?
Phylum - Mollusca
Class - Cephalopoda
Genus - Loligo
1 - Arm
2 - Tentacle
3 - Sucker
5 - Eye, which is far more advanced than other invertebrates, super similar to humans
8 - Mantle
9 - Mouth - contains radula
10 - Buccal mass (contains beak) - Tears prey into managable pieces
39 - Pen
Circulatory system contains a hemoglobin-like protein for oxygen transport
