Echinodermata (lecture 15) Flashcards
Echinoderms and chordates are deuterostomes.
What does the phylum name ‘Echinoderm’ mean?
Spiny-skin.
What class does the common starfish belong to?
Class Stelleroidea.
What are calcareous ossicles?
Hard calcareous plates in the exoskeleton of an Echinoderm.
What is unique to Echinoderms?
The water vascular system.
Explain the water vascular system
A network of hydraulic canals branching into tube feet.
Name a secondary characteristic of Echinoderms
Pentamerous radial symmetry.
Madreporite
The opening of a sea star’s water vascular system.
How do Echinoderms exchange gases and waste?
Between the coelomic fluid and seawater across the tube feet and other surface structures.
Are Echinoderms monoecious?
No, they are dioecious.
What are the six classes of Echinoderms?
CHOCEA:
- Crinoidea
- Holothuroidea
- Ophiuroidea
- Concentricycloidea
- Echinoidea
- Asteroidea
What are the organisms belonging to the class Crinoidea?
Sea lilies and feather stars.
What are the organisms belonging to the class Holothuroidea?
Sea cucumbers.
What are the organisms belonging to the class Ophiuroidea?
Brittle stars.
What are the organisms belonging to the class Concentricycloidea?
Sea daisies.
What are the organisms belonging to the class Echinoidea?
Sea urchins and sand dollars.
What are the organisms belonging to the class Asteroidea?
Sea stars.
Phylogenic tree?
Deuterostomia=Echinodermata and Chordata
