Molluscs

Question 1

Phylum _____:

200,000 species
– More species in ocean than any other animal group
• Soft body enclosed by calcium carbonate shell
• Body covered by mantle

Answer 1

Mollusca

Question 2

Mollusca :

Displays ____ Symmetry
uses ______ for locomotion

Answer 2

Bilateral
ventral muscular foot

Question 3

The body of mollusca is covered by a Thin layer of tissue that secretes the shell called____.

Answer 3

mantle

Question 4

Some Mollusks have ____ which is:
– Ribbon of small teeth used to rasp food from
surfaces
– Made of chitin
-has a chisel-like design

Answer 4

radula

Question 5

is a coiled mass of vital organs wrapped
in a dorsal shell.

Answer 5

Mollusc

Question 6

Name three classes of mollusca

Answer 6

1. Gastropod
2. Bivalvia
3. Cephalopoda

Question 7

known as stomach foot and are the most common mollusks.
•Snails, limpets, abalone, and nudibranchs.
•75,000 spp.

Answer 7

Class Gastropod

Question 8

What kind of Gastropod has???

– No shell
– Colorful branches of the gut and gills
– Prey on sponges and other invertebrates
Produce noxious chemicals or retain undischarged nematocysts
taken undigested from prey

Answer 8

Nudibranchs (sea slugs)

Question 9

Class _____:

• Clams, mussels, and oysters
• Body laterally compressed and enclosed with two parts
(valves)
• No head or radula
• Gills expanded and folded used to obtain oxygen, and filter
and sort food particles from water

Answer 9

Bivalvia

Question 10

Clams burrow in sand or mud and water drawn in
and out of mantle by ____ which allow clam to feed and obtain oxygen while buried

Answer 10

siphons

Question 11

Mussels secrete ___ that attach them to
rocks and other surfaces

Answer 11

byssal threads

Question 12

____ cement their left shell to hard
surface and other to another; they also produce pearls

Answer 12

Oysters

Question 13

______ bores in mangroves, driftwood, and
pilings
– Have symbiotic relationship w/ bacteria in the gut that
digests wood
– Valves lie at the inner end of tunnel lined w/ calcium
carbonate and siphon protrudes from entrance
– _______ = settles on bottoms of boats, pilings,
and other submerged surfaces

Answer 13

Shipworm; Fouling organism

Question 14

Class _____ (head footed)
• Predators specialized in locomotion
• Octopi, squid, and cuttlefish
• Agile swimmers w/ complex nervous system and reduction
or loss of shell
• All are marine

Answer 14

Cephalopoda

Question 15

What class have…??
• Large eyes on side of head
• Thick muscular mantle which protects head
• Water enters mantel and leaves through siphon =______

Answer 15

Cephalopod; jet propulsion

Question 16

What kind of Cephalopod??

– Eight long arms (2 in to 30 feet)
– Bottom dwellers that live in crevices, bottles, etc
– Have beak-like jaws and radula to rasp flesh and secrete
paralyzing substance
– Distract predators with dark fluid from ink sac

Answer 16

Octopi

Question 17

What kind of cephalopod???

– Two triangular fins on mantle – better swimmers than
octopi
– Can remain motionless, move forward, or backward
– Eight arms and two tentacles, all with suckers
– Has pen in upper surface of mantle
– Few cm to 60 feet!!

Answer 17

Squid

Question 18

What kind of cephalopod??

– Eight arms and two tentacles, but body flatten w/ fin
running along the body
– Have calcified internal shell aids in buoyancy

Answer 18

Cuttlefish

Question 19

What kind of cephalopod??

– Coiled external shell containing gas filled chambers
serves as buoyancy organ
– Has suckerless tentacles

Answer 19

Chambered Nautilus

Question 20

_______ (class Polyplacophora – bearer of many plates)
– All marine
– Eight overlapping shell plates covering dorsal surface
– Live in shallow hard bottoms
– Have radula to rasp algae

Answer 20

Chitons

Question 21

_____ or _____ (class Scaphopoda)
– Elongated shell tapered at end resembling elephant tusk
– Sandy muddy bottoms in deep water
– Many species have thin tentacles to capture small prey

Answer 21

Tusk shells or scaphopods

Question 22

Which classes posses a ganglia??

Answer 22

Gastropods and bivalves

Question 23

What class ???

– Most complex of invertebrates
– Brains coordinate and store information
– Complex eye reflects development
– Octopi and cuttlefish can learn

Answer 23

Cephalopods

Question 24

What class display rapid color change coordinated with behaviors
and moods, from sexual display to camouflage

Answer 24

Cephalopods

Question 25

Cephalopods – modified arm to transfer _____

Answer 25

spermatophore