Echinoderms Flashcards
0
Q
What are the 4 characteristics of the echinoidea?
A
No arms
Pentiradial
Secondarily bilateral
Feeding mechanism is aristotle’s lantern
1
Q
What are the characteristics of the echinoderms?
A
Coelomate deuterostomes All marine Primitively bilateral External fertilization Central nerve ring Water vascular system
2
Q
What is the endoskeleleton of the echinoderms made of?
A
Calcium carbonate olates
3
Q
What are the 5 classes of echinoderms?
A
Holothuroidea Asteroidea Echinoidea Ophiuroidea Crinoidea
4
Q
What is the central nerve ring?
A
Nerve centre at the base of each arm in echinoderms
5
Q
Describe the water vascular system in echinoderms
A
An internal closed system of reservoirs and ducts. The water is sucked in through a perforated plate.
6
Q
How do echinoderms reproduce?
A
They use external fertilisation and shoot the sperm into the sea
