Question 1

Why do zoologists not have a well-accepted theory for the origin of segmentation?

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Question 2

Discuss the importance of a trochophore larva in both the Annelida and the Mollusca.

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Question 3

Why does the wound from the bite of a leech bleed profusely?

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Question 4

The Branchiobdellida,is a group of small annelids that contains parasites or commensals of crayfish.They show similarities to both oligochaetes and leeches in that they bear a head sucker.In your analysis,is the evolution of a head sucker a derived trait in an oligochaete lineage or would the loss of posterior sucker place them in the Hirudinea?

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Question 5

Speculate why polychaetes are overwhelmingly marine organisms.

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Question 6

In the earthworm,food is drawn into the mouth by the pumping action of the _____________.

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Question 7

Older taxonomic treatments represent the Annelida as consisting of three classes: Polychaeta,Oligochaeta,and Hirudinea.Compare and contrast that representation to what we know about phylogenetic relationships within the phylum today.

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Question 8

The spaces in the coelom of leeches are called the _______________.

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Question 9

The temporary food storage organ in the earthworm is the _________________.

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Question 10

When earthworms mate,the _______________ secretes mucus to hold them together.

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Question 11

The most recent molecular evidence suggests that the Annelida and Mollusca are more closely related to each other (in the clade Lophotrochozoa)rather than either phylum is to the Arthropoda (clade Ecdysozoa).Do you think 1)it matters that this distinction is made,and 2)should the use of molecular evidence by itself be the sole means of distinguishing the affinities of these groups? Support your argument.

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Question 12

Of what evolutionary significance is the "hydrostatic skeleton"?

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Question 13

In leeches,a cocoon into which fertilized eggs will be deposited is secreted by the __________.

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Question 14

The Hirudinida are unique in that they have both an anterior and a posterior ___________.

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Question 15

________________ cells surround the intestine in the earthworm and function in excretion and in synthesizing glycogen and fats.

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Question 16

Discuss why segmentation is such an important innovation in the Annelida.

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Question 17

Earthworms are hermaphroditic.Is this an evolutionary relic where they have been unable to evolve separate sexes,or is this an advantage for an organism with their life style? Explain your answer.

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Quiz 17: Annelids and Allied Taxa