Phylum Molluska

Question 1

Taxonomy for Phylum Molluska:

Answer 1

Kingdom Animalia
Subkingdom Bilateria
Division Protostomia
Superphylum Lophotrochozoa
Phylum Molluska

Question 2

Class Gastropoda Synapmorphies

Answer 2

Asymmetric Coil

Torsion

Question 3

Class Cephalopoda Synapomorphies

Answer 3

Symmetric Coil
Shell Chambered 
Beak like radula
Food divided into arms
Mantle folded as single siphon
Siphuncle

Question 4

Class Bivalva Synapomorphies

Answer 4

Shell with 2 hinged valve

Mantle folded as double siphon

Question 5

Class Scaphopoda Synapomorphies

Answer 5

Shell with 1 tubular valve

Captaculae

Question 6

Classes Gastropoda and Cephalopoda Synapomorphies

Answer 6

shell with 1 coiled valve

Question 7

Class Polyplacophora synapomorphies

Answer 7

shell with 8 valves

Question 8

Class Monoplacophora Synapomorphies

Answer 8

Shell with 1 conical valve

Question 9

Classes Monoplacophora, Gastropoda, Cephalopoda, Bivalva, and Scaphopoda Synapomorphies

Answer 9

Shell 1-2 valves
Shell with 3 layers
1) Periostracum
2) Ostracum
3) Hypostracum

Question 10

Phylum Molluska Synapomorphies

Answer 10

Preoral Tentacles - come off around mouth
Radula - feeding
Muscular Foot - locomotion
Mantle - tissue that makes shell

Question 11

Classes Gastropoda, Cephalopoda, Bivalva, and Scaphopoda Synapomorphies

Answer 11

Internal Gills surrounded by mantle

Question 12

Classes Bivalva and Schophoda synpomorphies

Answer 12

Decephalized

Mantle envelopes entire body

Question 13

Additional Features of Phylum Molluska

Answer 13

Triploblastic
Cephalized
Bilaterally Symmetric
Eucolemate

Question 14

Class Polyplacophora (Katharina tunicata)

Answer 14

Usually Dioecious
Algivore
Prograde or retrograde locomotion
Marine only habitat

Question 15

Prograde or retrograde locomotion definition

Answer 15

Prograde: Direction of movement and direction of muscular wave are the same direction

Retrograde: Direction of movement and direction of muscular wave are in different directions.

Question 16

Class Monoplacophora (Patella vulgata) features

Answer 16

Dioecious
Aligivores
Prograde or retrograde locomotion
Marine only habitat

Question 17

Class Gastropoda (Helix aspersa) features

Answer 17

Dioecious or monoecious
Algivores
Prograde or retrograde locomotion
Marine, fresh water, or terrestrial habitats

Question 18

Torsion means what for Class Gastropoda?

Answer 18

The body turns 180 degress

Question 19

How do Gastropods protect themselves?

Answer 19

They draw their head in first into their shell due to the organs being near their head. Then they draw in their foot.

Question 20

Why have some Gastropods have lost their shell?

Answer 20

Due to new defenses they have developed. Like fitting under really tight spaces or shooting ink as a defense mechanism.

Question 21

Class Cephalpoda features

Answer 21

Dioecious 
Predacious 
Closed circulatory system with 3 hearts
Complex Eye
Chromatophores
Complex behavior
Variable locomotion
Marine Only Habitat

Question 22

Describe the Circulatory system of a Cephalopod

Answer 22

2 branchial hearts pump deoxygenated blood into the gills

1 systemic heart pumps oxygenated blood into the body

Question 23

What are chromatophores used for?

Answer 23

Defense, mating, and hunting