Flashcards in Phylum Echinodermata Deck (7)
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1
Q
what are the 5 classes in this phylum?
A
1) Holothuroidea
2) Crinoidea
3) Echinoidea
4) Ophiuroidea
5) Asteroidea
2
Q
describe the phylum echinodermata
A
- ‘spiny skinned’ animals
- secondarily radially symmetrical
- tube feet
- ossicles
- water vascular system that operates podia
3
Q
what are in the class Holothuroidea and describe them?
A
sea cucumbers
- fleshy body with tentacles surrounding the mouth
4
Q
what are in the class Crinoidea and describe them?
A
sea lilies (stalked) and feather stars (have lost stalks) - flower like and mouth at the top
5
Q
what are in the class Echinoidea and describe them?
A
sea urchins
- fused ossicles
- show a degree of bilateral symmetry
6
Q
what are in the class Ophiuroidea and describe them?
A
brittle stars
star shaped with 5 arms and a central disc
7
Q
what are in the class Asteroidea and describe them?
A
star fish
star shaped - central disc not as obvious as brittle stars
- some have long arms some short
- some have > 5 arms
