Phylum Echinoderms Flashcards
1
Q
How do they exchange has ?
A
Through the skin gills .
2
Q
What does the water-vascular system do ?
A
It helps operate numerous hollow tube feet
3
Q
Function of tube feet ?
A
- aid in movement
* help hold onto substrate •manipulate prey
4
Q
What type of fertilisation ?
A
External and occurs in the water where eggs and sperms are released .
5
Q
What are the different classes ?
A
- echinoidea-sea urchin
- asteroidea-star fish
- Crinoidea- star baskets
- holothuroidea-sea cucumber
- ophiuroidea- brittle stars
6
Q
Features of a star fish?
A
- central disk
- sieve plate
- spine
- tube feet
- skin gill
- ring canal
7
Q
What are the Features of echinoderm ?
A
- live in sea water
- adults radially symmetrical
- larvae are bilaterally symmetrical
- Motile is slow
- coelom exists and spines
