5.2 Arthropoda

Which of the following are true of arthropods?

(There's more than one correct answer)

• There are more species of arthropods on land and sea than in all other phyla in the animal kingdom combined

• All arthropods are bilaterally symmetric

• The phylum Arthropoda includes the classes Gastropoda and Cephalapoda

• Most marine arthropods are Crustaceans

Match the following

• an armored shield that covers the anterior portion of crustaceans, turtles, and arachnids

• maxillipeds

• three appendages used to maneuver food into crustacean's mouths

• carapace

• the interior part of an arthropod body consisting of a head and other body segments fused together

• Molting

• the process of shedding an exoskeleton

• cephalothorax

Which of the following are true of crustaceans?

(There will be more than one correct answer)

• have gills

• have an endoskeleton

• have two sets of antennae

• are called the insects of the sea

Match the following types of crustaceans to their descriptions.

• planktonic organisms that resemble shrimp; large quantities found in cold polar waters

• Krill

• they use a glue that's impervious to water to attach to things. Bodies surrounded by calcium plates

• Amphipods

• have laterally compressed bodies

• Barnacles

• have ventrally compressed bodies and are found among seaweed, among plankton, and in skin of whales

• Isopods

• some filter water through their mouth to catch food, some are parasitic, others catch prey

• Copepods

Explain the difference between open and closed circulatory systems.