Phylum Echinodermata Flashcards Preview

Animal Diversity - year 2 > Phylum Echinodermata > Flashcards

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