EEMB 3: Animals - Echinoderms Flashcards
T/F: Echinoderms are also found on land
false, marine only
What type of skeleton do echinoderms have
a calcified internal skeleton
What type of vascular system do echinoderms have?
Water vascular system
Describe the water vascular system
fluid filled canalscontrol the tube feet
What symmetry do echinoderms have?
biradial
What symmetry do echinoderm larvae have?
bilateral
echinoderms have a poorly developed ____ and very basic body plans. The water vascular system is pretty much the main thing running.
nervous system
Where does the calcium carbonate shell come from?
specialized shells that originate from the embryonic mesoderm
What links the WVS to the seawater
sieve plate
___ canal connects to the ring canal and _____ radiate from the ring canal
stoneradial
____ are connected to all tube feet
bulbs
____ protrude between the sieve plates and are retracted by _____ muscles
tube feetlongitudinal
Two subphyla of the echinoderms
Pelmatozoa -crinoidsEleutherozoa - the rest
What are the crinoids? What is their type of locomotion?
sea lillies and feather starssessile organisms
Describe the feeding in crinoids
tube feet used for filtering and then conveyor-belt the food to the mouth using cilia
