Marine Biology Chapter 11 - Echinoderms

Sea stars are bottom-dwelling invertebrates that are not fish at all; they have neither scales nor a backbone.

Sea stars are echinoderms that lack body segmentation but have radial symmetry and an internal skeleton.

The seafood industry considers them pests because they can eat large numbers of commercially important bivalves.

<p>The sea star uses its tube feet to grasp the clam and pull the shells in opposite directions until the clam opens.</p> Signup and view all the answers

<p>Sea stars use tube feet with suction disks that cling to surfaces, enabling movement by controlling the clinging and pulling actions.</p> Signup and view all the answers

<p>Crinoids have feathery arms atop a jointed stalk and filter feed by capturing zooplankton with their arms.</p> Signup and view all the answers

<p>It is a bulblike structure at the top of each tube foot, used in movement.</p> Signup and view all the answers

<p>It is the five-toothed mouth part in sea urchins used for eating algae.</p> Signup and view all the answers

<p>They are solitary, nocturnal echinoderms with long, skinny arms for moving.</p> Signup and view all the answers

<p>Echinoderms having many feathery arms, usually atop a jointed stalk.</p> Signup and view all the answers

<p>They are spiny-skinned animals with radial symmetry, an internal skeleton, but no body segments.</p> Signup and view all the answers

<p>An internal skeleton, first seen in echinoderms.</p> Signup and view all the answers

<p>Tiny light receptors located at the end of each arm.</p> Signup and view all the answers

<p>Crinoids that move by flapping their feathery arms.</p> Signup and view all the answers

<p>A round echinoderm with no arms and short spines covering the skin.</p> Signup and view all the answers

<p>Echinoderms with a soft, oblong body and tube feet arranged in five rows; they have no arms, spines, or endoskeleton.</p> Signup and view all the answers

<p>Sessile crinoids with feathery arms that live attached to the seafloor by a stalk.</p> Signup and view all the answers

<p>Echinoderms that usually have five arms radiating from a central body.</p> Signup and view all the answers

<p>A round echinoderm with no arms and long spines covering the skin.</p> Signup and view all the answers

<p>A small filter on the dorsal surface of sea stars through which water enters.</p> Signup and view all the answers

<p>Small, ciliated projections on the skin of sea stars, used for breathing.</p> Signup and view all the answers

<p>Tiny feet located in grooves under the arms of echinoderms; used in feeding, breathing, and movement.</p> Signup and view all the answers

<p>A network of water-filled canals that aids in movement and feeding.</p> Signup and view all the answers