Lab 3 - Mollusca

Question 1

What makes up the basic body plan of the mollusk?

Answer 1

Head (occasionally), visceral mass, foot, and mantle

Question 2

What does the head contain?

Answer 2

Mouth, tentacles, and eyes

Question 3

What does the visceral mass contain?

Answer 3

Heart, gonads, intestines, kidneys, disgestive system

Question 4

What kind of coleom do Mollusks have?

Answer 4

Eucoleoms (coleomate)

Question 5

What is the function of the foot?

Answer 5

Anchorage and movement

Question 6

What is the function of the mantle?

Answer 6

Secreting the shell and gas exchange

Question 7

Mantle cavity houses…

Answer 7

Houses the gills

Question 8

Pericardia

Answer 8

Coleomic chambers where the heart, gonads, and kidneys are stored

Question 9

What kind of circulatory system do they have and what features does it have?

Answer 9

All except cephalopodia have open circulatory systems, with the “heart” being the hemocel

Question 10

Clades within Mollusca

Answer 10

Aculifera and Conchifera

Question 11

Taxa within Aculifera

Answer 11

Polyplacophora

Question 12

Taxa within Conchifera

Answer 12

Gastropodia, Cephalopodia, Schaphopodia, Bivalvia

Question 13

Characteristics of Gastropodia

Answer 13

Spiraling, torsion, anus above head

Question 14

Cephalopodia Synapomorphy

Answer 14

Loss or lack of the shell, Lobed foot, highly developed head

Question 15

Scaphopodia Synapomorphy

Answer 15

Ventral valve fusion, used for gas exchange, no gills

Question 16

Bivalvia Synapomorphy

Answer 16

Dorsal hinge and two valves (shells)

Question 17

Polyplacophora synapomorphy

Answer 17

Eight valved/plated shell

Question 18

What is radula?

Answer 18

Structure with teeth on the odontophore (cartilage) that move due to odontophore and radula protractor and retractor muscles that is used for feeding, scraping

Question 19

Which class has specialized and well developed eyes?

Answer 19

Gastropoda

Question 20

Ctendia

Answer 20

the gills of bivalvia, used for filter feeding

Question 21

Captacula

Answer 21

Long tentacles covered by cilia and mucus in Scaphopoda

Question 22

What is the beak made of in cephalopodia

Answer 22

Keratin

Question 23

Function of the pen

Answer 23

Provides support to squid, reminant of shell

Question 24

Special charactaristics of squid

Answer 24

Siphon to push out water and ink, one systemic heart and two branchial hearts,