annelida

Question 1

What is the distinguishing characteristic of annelida?

Answer 1

segmented bodies, meaning body elements may show repetition (metamerism)

Question 2

What type of support system is found in annelida?

Answer 2

hydrostatic skeleton

Question 3

What type of digestive system is found in annelida?

Answer 3

complete

Question 4

what type of circulatory system is found in annelida?

Answer 4

closed

Question 5

How many tissue layers are found in annelida? what is the name of the body cavity?

Answer 5

they are triploblastic and possess a coelom

Question 6

What is the nervous system of annelida like?

Answer 6

a dorsal brain and a ventral nerve cord

Question 7

How do annelids reproduce?

Answer 7

annelids are hermaphroditic, meaning they are monoecious

Question 8

What class of annelida can sandworms be found in?

Answer 8

polychaeta

Question 9

What are the distinguishing features of polychaetes?

Answer 9

members of polychaeta have side flaps called parapodia that contain the bristle-like setae, they also have a well-differentiated head

Question 10

How do members of polychaeta feed?

Answer 10

some suspension feed, some carnivorous

Question 11

Where can the oldest segments of annelida be found?

Answer 11

closest to the head

Question 12

Where can the youngest segments of annelida be found?

Answer 12

farthest from the head

Question 13

What are some distinguishing characteristics of the subclass oligochaeta, or class clitellata?

Answer 13

these annelids lack parapodia so rely on the entire epithelial surface for gas exchange. they also possess the clitellum, a tool for reproduction

Question 14

What is the purpose of the parapodia?

Answer 14

parapodia are modified in different species, however they are essential for gas exchange and respiration in all

Question 15

What is the function of setae in annelids?

Answer 15

locomotion

Question 16

What is the name of the fleshy flap that covers the mouth of oligochaetes?

Answer 16

prostomium

Question 17

What is the function of the pharynx in earthworms?

Answer 17

pumping in soil

Question 18

what is the function of the crop in earthworms?

Answer 18

temporary storage of food before passing into the gizzard

Question 19

what is the function of the gizzard in earthworms?

Answer 19

location where soil is mechanically ground up and food is separated from inorganic material

Question 20

What is the function of the seminal vesicles in earthworms?

Answer 20

lobed organs that extend dorsally around each side of the esophagus that store maturing sperm

Question 21

what is the function of the seminal receptacles in earthworms?

Answer 21

ventrally located organs that receive sperm during copulation and store until needed to fertilize eggs in cocoon

Question 22

How do you located the nephridia in earthworms?

Answer 22

paired excretory organs located in body wall that release waste fluis; hard to see unless under microscope

Question 23

What are the partitions between each segment in earthworms called?

Answer 23

septa

Question 24

What is the function of the typhlosole in earthworms?

Answer 24

to increase surface area of intestine

Question 25

Do annelids possess a cuticle?

Answer 25

yes, however unlike nematodes and the rest of ecdysozoa, annelids do not shed their cuticle

Question 26

What are the distinguishing features of subclass oligochaeta, class hirudinida?

Answer 26

these are typically ectoparasites (leeches) that are fluid feeders. they possess posterior and anterior suckers