Section 21.2- Echinoderms and Rotifers Flashcards
starfish,, sea urchins, sand dollars, sea cucumbers, and brittle stars are all spiny-skinned invertebrates , aka
echinoderms
echinoderms phylum name literally means
hedgehog skin
flattened part of echinoderm where flexible arms, or rays, radiate
central disk
echinoderms are the only animals with a _____________________
water-vascular system
a complex system of water-filled tubes that extends throughout the body
water-vascular system
the water-vascular system is used in
sensory reception
feeding
respiration
the best-known echinoderm
starfish
starfish have __________ arms or rays
5
at the end of each ray is a small light-sensitive
eyespot
between the plates of a starfish’s body are small tufts of skin that act as
gills
located on the underside of each ray
used for holding onto things, for moving, and for opening the shells of oysters and clams
tube feet
the tube feet of the starfish are connected to the
run the length of each ray from a ring canal and central disk
radial canals
water is taken into the starfish body through the
madreporite
starfish have the ability to
regenerate
the smallest multicellular animals
microscopic invertebrates found in freshwater lakes and ponds
rotifers
