deuterstomia: subphylum echinodermata Flashcards
(6 cards)
1
Q
what are these organisms known as?
A
spiny skin organisms
2
Q
what organisms are in the subphylum echinodermata?
A
sea stars, sea urchins, brittle star, sea cucumbers, feather star, sand dollars, sea biscuits
3
Q
what covers the exoskeleton and what is the exoskeleton made of?
A
made of hard calcareous plates protected by a thin epidermis
4
Q
how do sea stars move water through their vascular systems?
A
by using a network of hydraulic canals that branch into tube feet
5
Q
what do the vascular systems aid in?
A
locomotion and feeding
6
Q
what is the order of water flow through a sea star? (7)
A
1) water enters through madreporite
2) stone canal
3) ring canal
4) radial canal
5) lateral canal
6) ampulla
7) tube foot
