1. Phylum Echinodermata
By Kayla Wilkinson

2. Class Asteroidea Sea stars Most have 5 rays Some may have more
Rays are tapered and extended from the central disk
Have an endoskeleton
Water flows in and out the water vascular system through the madreporite

3. Class Asteroidea Have tube feet Have eyespots at the end of each ray
To eat sea stars push their stomachs out their mouth and spread their mouth over their food
Then enzymes turn the solid food into a liquid
The stomach then pulls back into the body

4. Class Asteroidea They excrete waste out the anus
Have pincer like pedicellariae that will pinch any animal that tries to crawl over it

5. Class Ophiuroidea Brittle stars Extremely fragile
If you pick one up some of its rays will fall off
This is their way of escape
While the predator is messing with the broken off ray the brittle star can escape
A new ray will regenerate within weeks

6. Class Ophiuroidea Don’t use tube feet for locomotion
Propel themselves with the snake-like, slithering motion of their flexible rays
Use tube feet to pass food particles up the rays and into the mouth

7. Class Echinoidea Sea urchins and sand dollars
Globe- or disk-shaped animals covered with spines
Don’t have rays
Sand dollars have a five-petaled flower pattern on the surface
Sand dollars covered with tiny, hair-like spines that are shed when the animal dies

8. Class Echinoidea
Sand dollars have tube feet that come out of the petal-like marking of the upper surface
They are modified into gills
Tube feet on bottom used for bringing food particles to the mouth

9. Class Echinoidea Sea urchins look like pincushions
Long usually pointed spines
Have long slender tube feet that aid in locomotion
Spines protect from predators
Also aid in locomotion such as burrowing

10. Class Holothuroidea Sea cucumbers
Leathery covering that allows them to be more flexible than any other echinoderms
Move with tentacles and tube feet
When threatened they will rupture their internal organs and release them out their anus
Then regenerate them within a few weeks

11. Class Holothuroidea
This confuses predators and the sea cucumber can get away
Reproduce by shedding eggs and sperm into water where fertilization takes place

12. Class Crinoidea Sea lilies and feather stars Resemble plants
Sea lilies only sessile echinoderms
Feather stars are sessile during larval form only
Adult feather stars use feathery arms to swim from place to place
Use feathery rays to capture organic particles