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Flashcards in Mullusca Test Deck (67):
0

Class of mollusca which has the largest # of species and are most successful

Gastropoda

1

What is the shell made of

Calcium carbonate

2

The front part of the foot that acts like a shovel is

Propodium

3

A tongue like scraper used for feeding is called

Radula

4

The mother of pearl layer is

Nacreous

5

Gastropod shells are spiraled in which direction?

Clockwise

6

The middle layer which provides strength is

Prismatic

7

A plate formed on the foot which protects the opening of the shell is

Operculum

8

The outer skin like layer is

Periostracum

9

The membrane that secretes the shell is

Mantle

10

The smallest oldest whorl is

Apex

11

The opening of the shell is

Aperature

12

The primary characteristic to classify is

Type of shell

13

The shell of which organism has 8 interlocking plates

Chiton

14

Pigments in the skin if Cephalopods that match their surroundings to their body is

Chromatophores

15

Gas exchange, waste excretion, and release of fertilized egg is done by

Visceral mass

16

Hatchet foot

Pelecopods

17

What class exhibit sexual internal fertilization?

Cephalopoda

18

The organ responsible for controlling the amount of liquid or gas contained in each chambered nautilus is

Siphuncle

19

The most specialized an advanced class

Cephalopoda

20

The organ that regulated fluid balance is

Inhalant and exhalent siphons

21

Which class contains 2 laterally compressed shells

Bivalvia

22

Grazing, filtering, predation, scavenging

Feeding techniques

23

The structure that contains the digestive, excretory, an reproductive organs is

Nephridia

24

Gills are called

Ctenidia

25

This class has unmatched maneuverability in the marine environment

Cephalopoda

26

The eyes of this can detect shadows, images, and shades of gray?

Octopus

27

All classes of mollusca have

Head foot, has a mantle, soft bodied invertebrates

28

Gastropoda have

Nudibranch, most common class, univalve, stomach footed, has an operculum, visceral mass with organs, snail, conch, whelk, primitive heart

29

Cephalopoda have

Foot specialized into tentacls, cuttlefish, ink sacs, nautilus, have Chromatophores, squid, octopus

30

Scaphopoda have

Tusk shell,

31

Pelecypoda have

Bivalve, clam, hatchet foot, oyster, scallop

32

Polyplacophora have

Bearing many plates, chiton

33

Why are mullusks commonly called shellfish?

Outer shell protects their soft bodies

34

Another name for the shell

Valve

35

Mass which holds the digestive, excretory? And reproductive organs

Visceral mass

36

The muscular foot is use for

Locomotion

37

What sheath of tissue surrounds the mantle cavity and most of the body

The mantle

38

What type of digestive system do mullusks have

Complete

39

A rasping organ used for feeding also scraping, tearing, and stabbing is

The radula

40

Which 2 classes do not have radula

Bivalvia and Aplacophora

41

What are Ctenidia?

Gills

42

Structures used to regulate fluid balance and excrete waste are

Nephridia

43

Do molluscs contain complicated or simple nervous and sensory systems?

Complicated

44

The shell of mullusks are composed of

Calcium carbonate

45

The shell is secreted by the

Mantle

46

The 3 layers are

Outer-periostracum
Middle-prismatic
Outer-nacreous

47

Why are shells ways to identify ancient species

They decay slowly and fossilize well

48

What are the 2 free swimming larval stages

Trkchophore
Veliger larvae

49

What types if feeding techniques are used by molluscs?

Filter feeding, grazing, scavengers

50

What classes are most important to humans?

Bivalvia, Gastropoda, Cephalopoda

51

Why are mollusca importan to humans

Food source and purify water

52

The shell of chiton is composed of how many plates

8

53

Chitons feed by

Grazing/scraping

54

Which class live in tubular shells open at both ends

Scaphopods

55

Scaphopoda feed by

On detritus an protist and which are captured in mucus

56

Gastropods are called univalves because

They have a single valve

57

Torsion is

A process that results in the rotation of the visceral mass and mantle on foot

58

Torsion takes place in the

Veliger stage

59

Are Gastropoda dioecious or monoecious

Both

60

Pelecypods are called

Bivalvia

61

Pelecypoda means

Hatchet foot

62

Bivalve shells are held shut by

Adductor muscles

63

Bivalves move by

The foot or clapping valves together

64

The organ that extends through each nautilus chamber is the

Siphuncle

65

Cephalopods jet water through what

Syphons

66

Where are fertilized eggs do posited for maturation?

Attached to substrate