Echinoderms Flashcards
having a radiating arrangement of parts and a body wall stiffened by calcareous pieces that may protrude as spines and including the starfishes, sea urchins
Echinoderm
the internal skeleton
endoskeleton
one of the minute pincerlike structures common to starfish and sea urchins, used for cleaning and to capture tiny prey
Pedicellariae
a sievelike plate in certain echinoderms, which water passes into the vascular system.
Madreporite
radial canals feed into lateral canals extending into tube feet
Radial canal
circular canal that links the radial canals
Ring canal
limb of a start fish
Arm / Ray
symmetry around a central axis, as in a starfish
Radial Symmetry
being divisible into symmetrical halves on either side of a unique plane
Bilateral Symmetry
network of water vessels in the body, the tube feet being operated by hydraulic pressure within the vessels.
Water Vascular System
groove where the tubed feet are located
Ambulacral Groove
provide protection to the echinoderm
Ossicles
secrete enzymes that help digest food
Pyloric Caecum
Stomach food is transfered to
Pyloric Stomach
stomach that is puked out
Cardiac Stomach
