| General Characteristics | Crinoidea | Asteroidea | Ophiuroidea | Echinoidea |
|---|---|---|---|---|
|
What is the madreporite?
beginning of water vascular system
|
What are sea lilies and feather stars?
representatives
|
What are gonads and digestive ceca?
these organs extend into each arm
|
What are brittle stars and basket stars?
names of representatives
|
What are sea urchins, heart urchins, sand dollars, sea biscuits?
representatives
|
|
What is an ampulla?
top of a tube foot
|
What is all are suspension feeders?
type of feeding
|
What are ambulacral grooves?
tube feet are within these
|
What is their arms branch?
Basket stars differ from brittle stars in this way.
|
What are the spines?
function for protection, movement, may secrete toxins or capture prey
|
|
What are the tube feet?
allow gas exchange with water
|
What is up?
direction of oral surface
|
What are papullae?
these help with gas exchange
|
What is the digestive system?
this organ system is generally confined to the central disc
|
What is the inflexible test?
ossicles joined by ligaments and calcified elements
|
|
What is connective tissue?
can rapidly alter stiffness and fluidity of this tissue
|
What is the calyx?
part of animal that contains all of the digestive system
|
What is autotomy?
can sever arms if threatened
|
What are madreporites?
May have many of these on the oral surface.
|
What are regular echinoids?
body is spherical
|
|
What are coelomocytes?
cells that aid in wound repair, transport nutrients, provide immune system, help form connective tissue
|
What are cirri?
flexible "legs" at base of feather stars
|
What are pedicellariae?
small jaws on aboral body surface
|
What are bursae?
function for gas exchange and waste removal
|
What is no true stomach?
Digestive system lacks this organ
|
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