Phylum Mollusca

Question 1

Common name

Answer 1

Mollusk
Soft body

Question 2

Symmetry

Answer 2

Bilateral- trophoblastic

Question 3

Organ systems

Answer 3

Complete digestive system
Open circulatory system
Cephalopods have complete CS
Vessels in gills
Reduced eucoelomate

Question 4

Diversity

Answer 4

Chitons
Snails
Cephalopods
Bivalves
8 classes

Question 5

Structure

Answer 5

Muscular foot
Visceral mass
Mantle
Gills
Radula
Trocophor -> veliger

Question 6

Shells

Answer 6

Calcium carbonate CaCo3
Mantle deposits
Cephalopods don’t have shell
Shells provide fossil record and index

Question 7

Radula

Answer 7

Rasping and drilling tounge
Venomous harpoons modified to beak

Question 8

Polyplacopora

Answer 8

Marine chitons
8 plates for dorsal shell

Question 9

Gastropoda

Answer 9

“Stomach foot”
Snails, slugs, nudibranches
Marine, freshwater, and terrestrial
Torsion (twisting)
Operculum

Question 10

Bivalve

Answer 10

“Two halves”
Oysters, clams, muscles, scallops
Filter feeders

Question 11

Cephalopods

Answer 11

“Head foot”
Squid, octopus, cuttlefish, nautiluses
Reduced shell, large complex eye, complex nervous system, closed circulatory system
Intelligence