2- Mollusca

Question 1

phylum:
- diverse group of soft-bodied animals
- most marine
- possess a true coelom
- have trochophore larvae like annelids

Answer 1

mollusca

Question 2

generalized mollusca 3 regions:

Answer 2

• foot
• visceral mass
• mantle

Question 3

region of mollusca: internal organs of mollusca

Answer 3

visceral mass

Question 4

region of mollusca: encloses the organs and secretes the material that makes up the shell in some groups

Answer 4

mantle

Question 5

an oral structure for scraping food from the substrate unique to moluscs

Answer 5

radula

Question 6

molluscs typically respire w gills called ___

Answer 6

stenidia

Question 7

blood circulation is ___ in all molluscs except ____

Answer 7

open; cephalopods

Question 9

mollusc class:
- “shellfish” (clams, oysters, mussels, etc.)
- shell is in 2 pieces

Answer 9

bivalvia

Question 10

mollusc class:
- squid, octopi, cuttlefish
- highly motile
- most species lack a prominent shell

Answer 10

cephalopoda

Question 11

in bivalves: the oldest and thickest part of the shell

Answer 11

umbo

Question 12

in bivalves: connects the two halves of the shell

Answer 12

hinge ligament

Question 13

in squids: visible immediately dorsal to the eyes under the mantle collar

Answer 13

pen

Question 14

in squid: 2 longer appendages

Answer 14

tentacles