Question 1

How does the statocyst work to communicate position to the crayfish?

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Question 2

The most diverse class of crustaceans is the __________________.

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Question 3

What is the evidence that the major tagmata in crustaceans are not homologous?

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Question 4

The excretory antennal glands in decapods are also called ________ _________.

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Question 5

The individual units of compound eyes in crustaceans are called ________________.

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Question 6

Why is the adaptive diversification of the Crustacea so great while that of other groups,such as the Annelida so much less?

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Question 7

Discuss the evolutionary significance of the serial homology of crustacean appendages.

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Question 8

Based on a count of individual organisms,a species in the copepod genus Calanus is likely the most abundant animal in the world.What features do copepods possess and what environmental factors contribute to this record status?

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Question 9

The ancestral larval form of crustaceans is the __________.

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Question 10

Describe the sequence of events that occur during molting and ecdysis in a crayfish and explain why a "soft craw" is vulnerable until it has hardened its shell.

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Question 11

Why are barnacles considered crustaceans when they are anchored in one place as adults?

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Question 12

Both clams and crabs are referred to in common terminology as "shellfish." However,zoologists do not consider them to be closely related.Provide a contrasting list of the differences between the crustacean decapods and the molluscan bivalves.

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Question 13

Discuss how modulation in expression of the Distal-less gene determines the location of distal ends of arthropod limbs.What is the significance of this?

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Question 14

In crustaceans,the molt-inhibiting hormone is produced in the ______________.

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Question 15

Crustaceans and molluscs of course do have a common ancestor at some point.Draw a reasonable phylogeny that includes the molluscs,annelids and arthropods including the crustacea,and describe the distinguishing features on each branch.There are several legitimate phylogenies.

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Question 16

How do the various pigments in the ommatidium work to provide images of variable field of vision or a continuous image in variable degrees of light and dark?

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Question 17

Explain why pentastomids were placed in Ecdysozoa.

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Question 18

Crustaceans are often referred to as the "insects of the sea." This is partially because crustaceans are so abundant in the sea,as insects are on land,and because insects never successfully invaded the marine environment.Discuss why crustaceans 1)are so abundant in the ocean,and 2)why they did not radiate extensively into terrestrial environments.

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Question 19

In the parasitic barnacle order Rhizocephala,the larvae metamorphose into a _______ stage that injects cells into the hemocoel of the crab that grows into root-like processes throughout the crab body.

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Quiz 20: Crustaceans