Sea Star External Anatomy

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aboral surface
top of the sea star; side without the mouth

ambulacral grooves
one long oral surface of each ray; contain tube feet

anus
centered aborally on disc; exit of waste

arm/ray
projecting from the disc; aids in movement

central disk
central region

eyespot
small, pigmented on one end of each arm; used to tell light and dark

madreporite
off centered on aboral surface; entrance of water

mouth
on oral surface in center; entrance of food

oral spines
surround the mouth; aid in getting food

oral surface
bottom of sea star; side with the mouth

spines
many short, rough, limy in patterns over aboral surface; used for protection

tube feet
2 or 4 rows in each groove; used for movement and the exit for water

We use cookies to give you the best experience possible. By continuing we’ll assume you’re on board with our cookie policy Central Disc The center part of the animal Arms or Rays. Protrude from disc. help sea star to move …

We use cookies to give you the best experience possible. By continuing we’ll assume you’re on board with our cookie policy arm/ray help with movement and capture prey madreporite (sieve plate) where water enters in the water vascular system WE …

We use cookies to give you the best experience possible. By continuing we’ll assume you’re on board with our cookie policy Arms Extensions of the body used for locomotion in some echinoderms Madreporite Opening through which the water enters the …

We use cookies to give you the best experience possible. By continuing we’ll assume you’re on board with our cookie policy cranial- toward the head caudal- toward the rear WE WILL WRITE A CUSTOM ESSAY SAMPLE ON ANY TOPIC SPECIFICALLY …

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We use cookies to give you the best experience possible. By continuing we’ll assume you’re on board with our cookie policy Madreporite opening of water-vascular system Spines used for protection…some are hallow and inject dissolved oxygen…keeps starfish clean WE WILL …

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