Show:
Small Crustaceans
Sea Star Structure
Decapods
Echinoids & Sea Cucumbers
Ophiuroids & Crinoids
100
This chemical complex gives crustaceans their "crusty" texture.
What is calcium carbonate?
100
This is the type of symmetry that best describes echinoderms.
What is radial symmetry?
100
These are the "claws" of decapods.
What are chelipeds?
100
Echinoids and Sea Cucumbers differ from other echinoderms classes because they lack these.
What are arms and bodies that are stretched along the oral/aboral axis.
100
Opiuroids are commonly known as this.
What is a brittle star?
200
This is the smallest and most abundant of all crustaceans. They are a dominant member of marine zooplankton and as small as .4 inches long.
What is the copepod?
200
This is the surface where the sea star's mouth is located.
What is the oral surface?
200
These appendages beat rhythmically in order to help the decapod swim.
What are swimmerets?
200
These give echinoids and sea cucumbers a test.
What are ossicles?
200
A brittle star can do this in order to sever a limb and escape from danger.
What is autotomy?
300
Copepods have two pairs of two of these for a total of four.
What are antennae?
300
The projections from the sea star's body are actually known as these.
What are rays?
300
These decapods use their rudimentary swimmerets to brood their eggs.
What are female lobsters?
300
Urchins use their tube feet or these in order to move about.
What are spines?
300
Feather stars move along the ocean floor by using these.
What are cirri?
400
These crustaceans are known in terrestrial environments as wood lice.
What are isopods?
400
These cells secrete an adhesive chemical and then a second chemical to breakdown the adhesive and are used to help an echinoderm attach to a surface.
What are duocells?
400
This decapod's exoskeleton lacks the calcification of most crustaceans and must use shells or other substitutes for protection.
What is a hermit crab?
400
Sea cucumbers use these appendages that are coated in mucus in order to capture plankton and detritis.
What are oral tube feet?
400
These crinoids are considered to be the oldest living fossils and are permanently attached to the ground by a long stalk.
What is a sea lily?
500
This is when a group of barnacles attach themselves to the bottom of a ship and increase drag, which decreases speed and fuel efficiency.
What is fouling?
500
These provide rigid structural support for the muscles.
What are ossicles?
500
This decapod's two distal leg segments on the back walking legs are flattened into paddles that can be used to aid in movement.
What is a blue crab?
500
Sand dollars perform respiration through these on their aboral surface.
What are petals?
500
Ophiuroids and crinoids are two classes that belong to this phylum.
What is Echinodermata?