Deck 11: Annelids and Allied Taxa

Question 1

Some echiurans are deposit feeders and some are suspension feeders.

Answer 1

True

Question 2

Clam worms and fanworms are members of the class Errantia.

Answer 2

True

Question 3

Errantia have more highly developed sense organs than earthworms.

Answer 3

True

Question 4

Annelids may be characterized as protostomes,with spiral cleavage and mosaic development.

Question 5

Most freshwater leeches are predators,but some are bloodsucking ectoparasites (micropredators).

Question 6

Leeches are found predominantly in freshwater habitats,but some are marine and a few are terrestrial.

Question 7

The giant echiurans which live in the deep ocean vents are unusual,as they harbor chemosynthetic bacteria.
Multiple Choice Questions

Question 8

The Errantia generally have a less well-developed head than other annelids.

Question 9

The Errantia have separate sexes,but the earthworms and leeches are hermaphroditic.

Question 10

Except in the leeches,the annelid coelom is filled with fluid and serves as a hydrostatic skeleton.

Question 11

Earthworms possess paired fleshy appendages called parapodia.

Question 12

The Errantia is the largest class of annelids.

Question 13

The most diverse class of annelids is the earthworms.

Question 14

Leeches typically lack both setae and septa.

Question 15

Annelids transport food,wastes,and respiratory gases via their circulatory system and the tracheal system.

Question 16

The following characteristics are typical of annelids:

A)segmentation,open circulation,and nephridiA.
B)segmentation,closed circulation,and nephridia.
C)no anus,nephridia,and coelom.
D)nephridia,coelom,and open circulation.

Question 17

The annelids,molluscs,and arthropods are considered members of Protostomia.

Question 18

Errantia differ from other annelids because errantia have

A)an indistinct head.
B)parapodia.
C)a clitellum.
D)all of these

Question 19

Annelids grow by producing new segments at the anterior end.

Question 20

The Errantia

A)belong to the smallest and most evolutionarily derived class of annelids.
B)are mostly freshwater inhabitants.
C)consist of active predators and sedentary particle feeders.
D)are hermaphroditic.

Question 21

Leeches

A)are found mainly in fresh water.
B)may be ectoparasites or micropredators.
C)are hermaphroditiC.
D)all of these

Question 22

Reproduction in the earthworm involves

A)asexual budding.
B)self-fertilization.
C)cross-fertilization between two dioecious organisms.
D)cross-fertilization between two hermaphroditic individuals.

Question 23

The circulatory system in the earthworm

A)is absent.
B)is an open type.
C)uses the dorsal vessel as the main pumping organ.
D)has no pumping structure and depends on the action of body muscles to move the blooD.

Question 24

_______________ is called the "fat innkeeper" because it has many commensals living in its burrow.

A)Bonellia
B)Riftia
C)Lingula
D)Urechis
Fill in the Blank Questions

Question 25

Echiurans

A)live in fresh water.
B)have a proboscis used in feeding.
C)are called water bears.
D)have a lophophore used in feeding.

Question 26

Most annelids possess tiny bristles called __________.

Question 27

The paired appendages used for locomotion in polychaetes are called _______________.

Question 28

Some typical leech characteristics are as follows:

A)anterior and posterior suckers,a clitellum,no setae.
B)setae,clitellum,and separate sexes.
C)parapodia,no setae,and hermaphroditism.
D)anterior and posterior suckers,separate sexes,and setae.

Question 29

In the annelids,each internal compartment is lined with _________.

Question 30

Leeches

A)have a fixed number of somites.
B)respire through gills.
C)lack excretory organs.
D)have a permanent clitellum.

Question 31

Movement in annelids involves

A)longitudinal muscles only.
B)circular muscles only.
C)longitudinal and circular muscles.
D)the hydrostatic skeleton only.

Question 32

The cocoon in the earthworm is produced by the

A)clitellum.
B)prostomium.
C)calciferous glands.
D)chloragogen cells.

Question 33

The clam worm gets food by

A)using its eversible pharynx.
B)muco-ciliary filter-feeding.
C)ingesting food-laden sand.
D)all of these

Question 34

Current medical uses of annelids involve

A)flatworms.
B)leeches.
C)polychaetes.
D)freshwater oligochaetes.

Question 35

Annelids are thought to be related to molluscs because

A)they have a similar nervous system.
B)a shared metameric body plan though the mechanism of segmentation may be different.
C)they both have a similar trochophore larva.
D)all of these

Question 36

The larva of polychaetes is

A)lacking.
B)a pilidium.
C)a trochophore.
D)a nauplius.

Question 37

The feathery arms of fanworms that trap food particles are the ______________.

Question 38

The typical nervous system of annelids consists of

A)a brain and a ventral nerve cord.
B)a ladder-like pattern.
C)a nerve net.
D)a brain,a ventral nerve cord,and a dorsal nerve corD.

Question 39

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

Question 40

Sipunculids

A)are marine dwellers.
B)live in burrows.
C)have a trochophore larva.
D)all of these

Question 41

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

Question 42

Until recently,the Annelida are a well-accepted _________________ group.

Question 43

Small burrowing marine worms with an eversible introvert (no spines)belong to the __________.

Question 44

The organs of excretion in the earthworm are ___________.

Question 45

The most basal group of the Annelida is probably the ________________.

Question 46

Members of the ____________ usually have a flattened proboscis that cannot be retracted into the trunk.

Question 47

Class Errantia is a _____________ taxon because ancestral oligochaetes arose from the polychaete clade.

Question 48

Leeches secrete both an anesthetic and __________ in their saliva.

Question 49

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

Question 50

The cells surrounding the intestine in the earthworm that function in excretion and in synthesizing glycogen and fats are the ______________ cells.

Question 51

Leeches depend on _____________ for digestion of their blood meal.