Mollusca

Front 1

The second largest animal phyla after Arthropoda

Back 1

Phylum Mollusca

Front 2

Latin word meaning soft (soft bodies)

Back 2

Molluscus

Front 3

Only snails and slugs are__________

Back 3

Terrestrial

Front 4

Limited to their range by their need for humidity, shelter, and presence of calcium

Back 4

Snails and slugs

Front 5

Triploblastic coelomate protostome invertebrates

Back 5

Mollusks

Front 6

Primarily represented by a small cavity around the heart

Back 6

Coelom

Front 7

600 species of chitons found on rocky marine shorelines

Back 7

Polyplacophora

Front 8

Contains an estimated 40,000-150,000 species of nudibranches, snails, and slugs. Also includes unique species such as limpets, sea hares, sea angel, sea butterfly, and sea lemon

Back 8

Gastropoda

Front 9

(Also called Pelecypoda) contains 8,000 species of clams, oysters, scallops, and mussels

Back 9

Bivalia

Front 10

Contains 786 species of squid, octopus, nautilus, and cuttlefish

Back 10

Cephalopoda

Front 11

Are rare and extremely deep-water creatures and will not be discussed

Back 11

Monoplacophora, Aplacophora, and Scaphapoda

Front 12

3 main parts of a mollusk

Back 12

Head, foot, and visceral mass

Front 13

A rasping, tongue-like organ found in all mollusks except bivalves

Back 13

Radula

Front 14

The large, muscular organ used for locomotion and prey capture

Back 14

Foot

Front 15

Part of the mollusk body that contains most of the organs

Back 15

Visceral mass

Front 16

A membranous sheath of skin extending from the visceral mass that hangs down on each side of the body, protecting the soft parts

Back 16

Mantle

Front 17

Space between the mantle and visceral mass

Back 17

Mantle cavity

Front 18

In ___________ the muscular mantle and its cavity create jet propulsion used in locomotion

Back 18

Cephalopods

Front 19

Is secreted by the mantle

Back 19

Shell

Front 20

3 layers of the shell

Back 20

Periostracum, prismatic, and nacreous layer

Front 21

The middle layer made up of calcium carbonate in a protein matrix

Back 21

Prismatic

Front 22

Name for the outer layer of a mollusk shell

Back 22

Periostracum

Front 23

Inner layer made of nacre

Back 23

Nacreous layer

Front 24

Includes the mouth, radula, salivary glands, and esophagus. It receives and preps food

Back 24

Foregut

Front 25

Contains the stomach and associated digestive glands used for sorting and crushing food

Back 25

Midgut

Front 26

Long, coiled organ used to absorb nutrients from digested food

Back 26

intestine

Front 27

Organs that remove metabolic wastes from a mollusk's body

Back 27

Nephridia

Front 28

Most mollusks have a pair of nephridia called ___________

Back 28

Metanephridia

Front 29

Type of circulatory system in which blood is not entirely contained within blood vessels; rather it through vessels in some parts of the body and enters open sinuses in other parts

Back 29

Open

Front 30

Type of circulatory system found in cephalopods; blood moves to and from tissues within blood vessels

Back 30

Closed

Front 31

Have a closed circulatory system with several hearts, blood vessels, and capillaries

Back 31

Cephalopods

Front 32

The free-swimming larva that emerges from the egg in many mollusks

Back 32

Trochophore

Front 33

The second larval stage of many mollusks; has large, ciliated lobes and the beginnings of a foot, shell, and mantle

Back 33

Veliger

Front 34

Means stomach

Back 34

Gastro

Front 35

Means foot

Back 35

Pod

Front 36

Most have a single shell

Back 36

Snails and conchs

Front 37

Structure used by filter feeding bivalves to bring in water containing small food particles

Back 37

Incurrent siphon

Front 38

The oldest and smallest whorl of a univalve shell

Back 38

Apex

Front 39

Process in which the visceral mass of a gastropod rotates 180 degrees during development

Back 39

Torsion

Front 40

The term cephalopod means this

Back 40

Head foot

Front 41

Material which composes the inner layer of a mollusk shell

Back 41

Nacre

Front 42

The term Gastropod means this

Back 42

Stomach foot

Front 43

A copper-containing pigment which causes mollusks to have blue blood

Back 43

Hemocyanin

Front 44

The term Bivalve means this

Back 44

Two shell

Front 45

Another name for the foregut; receives and prepares food for digestion

Back 45

Buccal cavity

Front 46

Type of symmetry exhibited by most mollusks

Back 46

Bilateral

Front 47

Another term for a mollusk shell

Back 47

Valve

Front 48

A protective plate made of tanned protein that covers the shell aperture when the body is withdrawn into the shell

Back 48

Operculum

Front 49

The oldest part of a bivalve shell

Back 49

Umbo

Front 50

Another name for bivalves, meaning "hatchet-footed animals" after their shape

Back 50

Pelecypoda

Front 51

Material which composes the middle layer of a mollusk shell

Back 51

Calcium carbonate

Front 52

Animals found on rocky marine shorelines with 8 overlapping plates on their dorsal surface

Back 52

Chitons

Front 53

Modified gills present in many aquatic mollusks; feathery or comb-like structures used for respiration

Back 53

Ctenidia

Front 54

Strong muscles which extend between the shells to tightly hold a bivalve's shell closed

Back 54

Adductor

Front 55

Structure that connects the two shells of a bivalve

Back 55

Hinge

Front 56

Location of the eyes or eyespots on a snail

Back 56

Tentacles