1. Phylum Echinodermata
Nada H. Lubbad
Phylum Echinodermata

2. Phylum Echinodermata Defining Characteristics
A complex series of fluid filled canals with numerous flexible feeding and locomotory appendages
5 pointed radial symmetry in adult(pentaradial symmetry)
- Chinodermata means “spiny skin”
- Echinoderms usually inhabit shallow coastal waters and ocean trenches
Phylum Echinodermata

3. - Have small feet called tube feet that aid in movement, feeding, respiration, & excretion. - Do not have circulatory, respiratory of excretory systems. - Have a nervous system but no head or brain. - There are two sexes and they can produce sexually and asexually, fertilization is external.
Phylum Echinodermata

4. - Change from a free-swimming bilaterally symmetrical larva to a bottom-dwelling adult with radial symmetry.
Phylum Echinodermata

5. Echinoderms Skeleton Have an internal skeleton of calcium carbonate
Ossicles vary in size and structure and are manufactured by specialized cells
Feeding biology?
eat mollusks, worms, and slow-moving animals
Phylum Echinodermata

6. Water vascular system
A separate coelom is used with interconnecting fluid filled tubes and canals
A ring canal circles the mouth and gives off 5 radial canals
The radial canal is exposed and runs along the ambulacral groove
Phylum Echinodermata

7. Water Vascular System
Phylum Echinodermata

8. Tube Feet The ampullae is a small ball that sits above the tube foot
Contraction and expansion of the ampulla accomplishes movement
Phylum Echinodermata

9. Taxonomic Summary Phylum Echinodermata Class Crinoidea
Class Concentricycloidea
Class Stelleroidea
Subclass Asteroidea
Subclass Ophiuroidea
Class Echinoidea
Class Holothuroidea
Phylum Echinodermata

10. Subclass Asteroidea
Phylum Echinodermata

11. Sea Stars The oral surface of each arm has a single ambulacral groove
Have a large coelom where all the main organs occur
Phylum Echinodermata

12. Phylum Echinodsermata
Nutrition
Mouth leads to a 2-part stomach: a large cardiac stomach and a smaller pyloric stomach.
The pyloric stomach connects with digestive glands (=pyloric cecae) that runs into each arm.
A short intestine extends from from the pyloric stomach to an anus on the aboral surface.
Associated with the intestine are rectal cecae that pump the fecal wastes out of the anus.
Phylum Echinodsermata

13. Phylum Echinodermata

14. Phylum Echinodermata

15. Phylum Echinodermata

16. Pedicellariae Specialized pinchers found on the aboral surface.
Phylum Echinodermata

17. Reproduction Sexual Reproduction
Can reproduce asexually by disk division
Sexual Reproduction
Dioecious with sperm or eggs produced in 2 or more gonads in each arm
Larval stage = bipinnaria
Phylum Echinodermata