vocabulary review ch 38 – echinoderms and invertebrate chordates
TRANSCRIPT
Vocabulary Vocabulary ReviewReviewCh 38 – Ch 38 –
Echinoderms and Echinoderms and Invertebrate Invertebrate ChordatesChordates
A radially symmetrical marine
invertebrate that has an
endoskeleton, such as a starfish, a sea
urchin, or a sea cucumber
Echinoderm
One of the small, calcium carbonate plates that make
up the endoskeleton of an
echinoderm
Ossicle
A system of canals filled with a
watery fluid that circulates
throughout the body of an echinoderm
Water-vascular system
One of many small, flexible, fluid-filled tubes
that project from the body of an echinoderm
and that are used in locomotion, feeding, gas exchange, and excretion
Tube foot
In some protists and invertebrates,
a protective covering that the organism secretes or builds around
itselfTest
On the surface of some
echinoderms, very small pincers that
are used for protection against
ectoparasites
Pedicellaria
The porous structure through
which water enters and exits
the water-vascular system of
echinodermsMadreporite
A tube that connects the
madreporite to the ring canal
Stone canal
Canal that encircles the mouth of an echinoderm
Ring canal
Canals that extend from the ring canal down each of the
rays of the starfish, delivering water to ampullae and tube
feetRadial canal
On the upper end of a tube foot of an
echinoderm, a bulblike sac that forces water into the tube foot and causes the tube foot to
expand
Ampulla
Stomach of the sea star that can turn inside out
through its mouth; transfers food to
the pyloric stomachCardiac stomach
Stomach that connects to a pair of digestive glands
in each arm
Pyloric stomach
Bilaterally symmetrical, free-swimming larva of
a sea star
Bipinnaria
An opening from the atrial cavity to
the exterior in certain fish
Atriopore