ch. 33 coelomates mollusca

Question 1

phylum of protostomes

Answer 1

• phylum anthropoda
• phylum annelida
• phylum mollusca

Question 2

subphylums of phylum anthropoda

Answer 2

• subphylum hexapoda
• subphylum myriapoda
• subphylum crustacea
• subphylum chelicerata

Question 3

class of subphylum hexapoda

Answer 3

class insecta

Question 4

class of subphylum myriapoda

Answer 4

• class symphyla
• class pauropoda
• class chilopoda
• class diplopoda

Question 5

classes of subphylum crustacea

Answer 5

• class maxillopoda
• class malacostraca
• class branchiopoda

Question 6

classes of subphylum chelicerata

Answer 6

class arachnida

Question 7

classes of phylum annelida

Answer 7

• class Polychaeta
• class clittelata

Question 8

classes of phylum mollusca

Answer 8

• class Cephalopoda
• class bivalvia
• class gastropoda
• class polyplacophor

Question 9

phylum mollusca characteristics

Answer 9

• soft body
• protective external shell
• 3 body parts
• open circulatory system
• metanephridia
• radula

Question 10

3 body parts of phylum mollusca

Answer 10

• foot
• visceral mass
• mantle

Question 11

radula in mollusca

Answer 11

unique tongue-like organ

Question 12

metanephridia

Answer 12

excretory gland

Question 13

radere

Answer 13

to scrape

Question 14

sexuality of molluscs

Answer 14

• separate sexes
• gonads located in visceral mass
• external fertilization
• include ciliated trochophore

Question 15

polyplacophora

Answer 15

• 8 dorsal plates
• foot acts as suction cup, nearly impossible to pry if off rocks

Question 16

poly

Answer 16

many

Question 17

placo

Answer 17

plate

Question 18

ex. of class bivalvia

Answer 18

clams, mussels, oysters

Question 19

how do gastropods move

Answer 19

inch along by rippling motion of elongated foot

Question 20

how do terrestrial snails perform gas exchange

Answer 20

lack gills, so use vascular mantle cavity

Question 21

characteristics of class bivalvia

Answer 21

• shells divided into 2 halves
• adductor muscle draws 2 halves tightly together
• no head
• gills for feeding and gas exchange
• complete gut
• open circulatory system

Question 22

ex. of polyplacophora

Answer 22

chitons

Question 23

ex. of gastropoda

Answer 23

snails, slugs, nudibranchs, abalone, limpets

Question 24

what is the largest class of protostomes

Answer 24

class gastropoda

Question 25

characteristics of Gastropoda

Answer 25

• shells can be reduced or lost
• most marine or freshwater, some colonized land

Question 26

where are eyes located in gastropoda

Answer 26

tips of tentacles

Question 27

how are bivalvia anchored when shell is open

Answer 27

extends its hatchet-shaped foot for motility

Question 28

how can scallops move about

Answer 28

by clapping its valves

Question 29

how do bivalvia take in food

Answer 29

• food particles trapped in mucus on gills
• use cilia to move food into mouth

Question 30

fresh water flow through bivalvia

Answer 30

fresh water flows in through incurrent siphon, over gills, then out through excurrent siphon

Question 31

ex. of cephalopoda

Answer 31

octopuses, squids, nautiluses, cuttlefish

Question 32

characteristics of cephalopoda

Answer 32

• fast-swimming marine predators
• closed circulatory system
• beaklike jaw
• change color
• well-developed brain/nervous system

Question 33

where is the coelom in mollusca

Answer 33

small area around heart