Chapter 23.6: Echinoderms Flashcards
Echinoderms are on the same __________ _____ as _________
evolutionary branch; vertebrates
Echinoderms have _____ _______
radial symmetry
Echinoderms have an ______ ________ made of interlocking ________
internal skeleton; ossicles
Echinoderms have a ____ _______ _____
water vascular system
A series of water-filled ____ ______ around a ______ ____
ring canals; central disk
Canals store water used for __________ and ________
circulation; movement
Changes in water _______ ______ and ______ tube feet
pressure; extend; retract
Echinoderms have a complete ________ ______
digestive system
Some echinoderms can ________ ____ and other body parts
regenerate; limbs
Most echinoderms reproduce _________
sexually
Crinoidea: ______ _____ and ___ ______
feather stars and sea lilies
Asteroidea: ___ _____
sea stars
Ophiuroidea: ______ _____ and _____ ____
brittle stars; basket stars
Echinoidea: ___ ______, ___ _______, and ____ ______
sea urchins; sea biscuits; sand dollars
Holothuroidea: ___ ________
sea cucumbers
