Snails - Gastropoda

Question 1

What are radula?

Answer 1

Rasping/scraping organ in mouth

Question 2

T/F: Radula teeth are found in multiple sheets (not single rows)

Answer 2

True

Question 3

Radula is made of what material?

Answer 3

Chiton

Question 4

The flat surface (tongue-like structure) behind (inside) the mouth of a snail is known as what?

Answer 4

Odontophore

Question 5

T/F: If you were to look inside a snail, you would find both a penis and a vagina, which would infer that the snail is monoecious

Answer 5

True

Question 6

Hermaphroditic is just another fancy word for a more common term known as what? (Hint: all in one house)

Answer 6

Monoecious

Question 7

How does sexual reproduction occur in snails?

Answer 7

Sperm exchange

Question 8

T/F: Some snails use darts to puncture their mates during sexual reproduction

Answer 8

True

Question 9

How are eggs laid?

Answer 9

Singularly or attached to a substrate as a jelly mass

Question 10

TOT: Do snails have direct or indirect development?

Answer 10

Direct development

Question 11

FITB: Hatchlings are ___________ adults

Answer 11

Miniature

Question 12

FITB: The radula is an organ in the mouth that is modified for ______ _________ or ___________ and envenomating prey

Answer 12

1. Shell boring
2. Harpooning

Question 13

What are the 3 main types of shell coils?

Answer 13

1. Sinistral
2. Central
3. Conospiral

Question 14

Why are the shells of snails shifted over on the side of the snail’s body rather than completely down the middle?

Answer 14

Helps with distributing weight better

Question 15

What sort of habitats can you find Gastropoda in? (3)

Answer 15

1. Marine
2. Freshwater
3. Terrestrial

Question 16

What is unique about Gastropoda feet?

Answer 16

They are muscular which helps with locomotion

Question 17

T/F: All Gastropoda types have distinct head structures/shapes

Answer 17

True

Question 18

T/F: Snails have gills

Answer 18

True

Question 19

What are the 4 most basic body structures found in a juvenile snail?

Answer 19

1. Mouth
2. Anus
3. Mantle cavity
4. Foot

Question 20

Locomotion can occur through what 2 techniques?

Answer 20

1. Secreted mucus (slime trail)
2. Ciliary waves

Question 21

Visceral refers to which side?

Answer 21

Back side

Question 22

FITB: During larval development of snails, their visceral mass turns ____º so mantle cavity then faces forward

Answer 22

180º

Question 23

FITB: When the visceral mass of a snail turns 180º, the ________ ______ becomes closer to the head

Answer 23

Mantle cavity

Question 24

What is the purpose of the 180º turn of the visceral mass?

Answer 24

To allow the head to retract into the mantle cavity/shell

Question 25

What is coiling?

Answer 25

The spiral shape of mantle/viscera/shell

Question 26

FITB: When coiling occurs, it allows enlarged _________ to exist in more compact forms

Answer 26

Viscera

Question 27

What was the name of the ancestral coiling form that snails had?

Answer 27

Planispiral

Question 28

For greater compactness, what cone shape did snails evolutionarily change to?

Answer 28

Conispiral

Question 29

T/F: Due to the changes of internal organs in snails due to cone shape/coiling shape, what body part do they lose in the process?

Answer 29

Ctenidium (respiratory organ)