Snails - Gastropoda Flashcards
What are radula?
Rasping/scraping organ in mouth
T/F: Radula teeth are found in multiple sheets (not single rows)
True
Radula is made of what material?
Chiton
The flat surface (tongue-like structure) behind (inside) the mouth of a snail is known as what?
Odontophore
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
True
Hermaphroditic is just another fancy word for a more common term known as what? (Hint: all in one house)
Monoecious
How does sexual reproduction occur in snails?
Sperm exchange
T/F: Some snails use darts to puncture their mates during sexual reproduction
True
How are eggs laid?
Singularly or attached to a substrate as a jelly mass
TOT: Do snails have direct or indirect development?
Direct development
FITB: Hatchlings are ___________ adults
Miniature
FITB: The radula is an organ in the mouth that is modified for ______ _________ or ___________ and envenomating prey
- Shell boring
- Harpooning
What are the 3 main types of shell coils?
- Sinistral
- Central
- Conospiral
Why are the shells of snails shifted over on the side of the snail’s body rather than completely down the middle?
Helps with distributing weight better
What sort of habitats can you find Gastropoda in? (3)
- Marine
- Freshwater
- Terrestrial
What is unique about Gastropoda feet?
They are muscular which helps with locomotion
T/F: All Gastropoda types have distinct head structures/shapes
True
T/F: Snails have gills
True
What are the 4 most basic body structures found in a juvenile snail?
- Mouth
- Anus
- Mantle cavity
- Foot
Locomotion can occur through what 2 techniques?
- Secreted mucus (slime trail)
- Ciliary waves
Visceral refers to which side?
Back side
FITB: During larval development of snails, their visceral mass turns ____º so mantle cavity then faces forward
180º
FITB: When the visceral mass of a snail turns 180º, the ________ ______ becomes closer to the head
Mantle cavity
What is the purpose of the 180º turn of the visceral mass?
To allow the head to retract into the mantle cavity/shell
What is coiling?
The spiral shape of mantle/viscera/shell
FITB: When coiling occurs, it allows enlarged _________ to exist in more compact forms
Viscera
What was the name of the ancestral coiling form that snails had?
Planispiral
For greater compactness, what cone shape did snails evolutionarily change to?
Conispiral
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?
Ctenidium (respiratory organ)
