Studied by 5 peoplewhat does Echinodermata mean?
spiny skin
what type of symmetry do Echinodermata have?
radial symmetry
what are some examples of Echinodermata?
Sea Star, Sea Urchin, Sea Cucumber, and sand dollars
what is their internal skeleton made of?
they are made of stiff plates of calcium called ossicles
what is the Bipinnaria?
the larvae of echinoderms
what is a water vascular system?
Network of fluid-filled canals that transport water throughout the echinoderms body creating a powerful suction for movement, opening up mollusk and gripping surfaces
an echinoderms water vascular system is connected to the…
tube feet
what are tube feet used for?
feeding, movement, respiration, excretion
what is a Madreporite?
small pores on the dorsal surface where water enters. It is attached to the stone canal, which is attached to the ring canal
what is the stone canal?
short tube attached the madreporite to the ring canal
what is the ring canal?
ring in the center of the sea stars body that attaches to the radial canals
what is the radial canal?
extends from the ring canal to the end of each arm which carries water to hundreds of tube feet
what are tube feet?
end of the radial canal. Much like a suction cup that has a sucker on the end and muscles, With water, suckers, and muscles, a hydraulic system is created, creating an enormous force for walking and opening clams
what is the ampulla?
a bulblike sac found on each end of a tube foot where water is forced in and out
how do Echinoderms feed?
they have an oral side where their mouth is located where it pulls its food into
what are Echinoderm’s nervous system comprised
nerve cells, radial nerves, sensory cells, eyespots, and
statocysts
Echinoderms have no brain, instead they have…
nerve cells which are called a nerve ring with connecting nerves called radial nerves
what are the classes of Echinoderms?
Asteroidea, Ophiuroidea, Echinoidea, Holothuriodea,
Crinoidea
describe the Asteroidea class
they have five or more arms with tube feet and are carnivores
what is another name for the Asteroidea class?
starfish or sea starts
sea stars have the ability to…
regenerate an arm as long as part of the central cavity is present
describe the class Ophiuroidea
they are nocturnal and have long thin, flexible arms
what are some examples of
Ophiuroidea?
brittle stars and basket stars
examples of Echinoidea
sand dollars and sea urchins
what type of feeders are Holothuriodea?
detritus feeders
what is an example of the
Holothuriodea?
a sea cucumber
Crinoidea are the…
most ancient of the Echinoderms
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