Echinodermata

How do the arms and central disc of sea stars differ from those of brittle stars discussed earlier?

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How do the arms and central disc of sea stars differ from those of brittle stars discussed earlier?

the central disc of sea stars bears a madreporite on the aboral surface, while brittle stars have the madreportie on the oral surface of the central disc

what role does the madreporite play in the water vascular system of sea stars?

-pressure regulator
-serves as a filter to keep out foreign particles
-serves as an entrance for seawater in the water vascular system

what method of food acquisition do sea cucumbers employ?

filter feeding/ deposit feeding

Because sea cucumbers have lost the sharp spines and hard endoskeleton on which most echinoderms rely for protection, how do they defend themselves?

if threatened excessively they may eviscerate their internal organs

name one characteristic (structure) that sea cucumbers possesss that would cause zoologists to group them in the same phylum with other echinoderms

-pentaradial symmetry
-water vascular system
-tube feet
-madreporite

which feature does echinodermata share with arthropoda

both cnidaria and echinodermata are radially symmetrical. which group of echinoderms is ecologically most similar to an Anthozoan (coral or sea anemone)?

which class of Echinoderms has a rigid exoskeleton composed of ossicles called plates?

which group does not use tube feet for locomotion?

which group of organisms are you very unlikely to find in the same habitat as echinoderms?