Quiz - Echinoderms and Arthropods

This is the underside of a blue crab. Is it a male or a female, and how can you tell?

• It's a female - I can tell by the shape of it's abdomen
• It's a male - I can tell by the shape of it's abdomen
• It's a female - I can tell because it's last set of legs are paddle-shaped
• It's a male - I can tell because it doesn't have any chelipeds

Which of these animals is most closely related to a lobster?

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Which of the following is NOT an Echinoderm?

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The long-spined urchin is important on coral reefs throughout the Caribbean. If they were to disappear, what change would occur?

• The fish would disappear
• The coral would die from disease
• The coral would become covered in fleshy algae
• plankton blooms would occur

Which species uses tube feet for locomotion and feeding?

• Sea urchin
• Clam
• Squid
• Lobster

These are the crab zoea of 3 different species of crabs. Where would you find them living?

• in the sediment, hidden from predators
• in the surface waters, floating with plankton
• under the abdomen of the female crab

Choose the species that does not match the description given (just one).

• Urchins - too many can destroy a kelp forest
• Urchins - too few can drastically change a coral reef
• Lobsters - reproduce by spawning, with no care for the developing eggs
• Sea cucumber - filter feed by passing sand through their bodies

What happens after a crab molts it's exoskeleton?

• a female will often mate
• their bodies are soft for a few days
• they are more susceptible to predators
• all of the above

This crab has an oversized

• carapace
• pincer cheliped
• crusher cheliped
• swimmeret appendage

What are these, on the underside of the abdomen?

• chelipeds
• swimmerets
• thorax
• walking legs