Nematoda

Question 1

What are Nematoda?

Answer 1

Roundworms

Question 2

What coelom formation does Nematoda have?

Answer 2

Pseudocoelomate or in some case acoelomate

Question 3

Nematoda have amphids. What are these?

Answer 3

Unique cephalic sense organs

Question 4

What is the outside layer of a Nematoda called? What has to happen to it when they are young?

Answer 4

Cuticle - juveniles molt = ecdysis

Question 5

What is the body wall of Nematoda have? (Hint. helps them move)

Answer 5

Longitudinal muscles

Question 6

Explain the excretory system of a Nematoda

Answer 6

Unique - 1 or 2 renette cells

Question 7

How do Nematoda reproduce?

Answer 7

Gonochoristic (separation of sexes)

Question 8

Explain the 3 different living styles of Nematoda

Answer 8

1- small and free-living (90,000 in rotten apple)
2- as parasites in most animals and plant groups
3- general and specific habitats (e.g Europe bear coaster only)

Question 9

Where is the brain found in Nematoda?

Answer 9

Wrapped around gut

Question 10

Nematoda is said to be Eutely. What does this mean?

Answer 10

Constancy of cell numbers = mitosis stops in all somatic cell once organogenesis is complete

Question 11

How many ecdysis (molts) do Nematoda go through?

Answer 11

4 during growth and maturation

Question 12

Explain the 1st molt stage of Nematoda (loses 5)

Answer 12

Entire cuticle is shed = larva loses lining of:

bucal capsule/pharynx/vagina/rectum/cloaca (a cavity)

Question 13

Explain the 2nd molt of Nematoda

Answer 13

Cuticle not discarded but forms protective sheath around 3rd stage larva

Question 14

What is the class of Nematoda?

Answer 14

Secernentea

Question 15

What do all species of the class Secernentea have?

Answer 15

Phasmids (stick like)

Question 16

What are the 3 orders of the class Secernentea?

Answer 16

1- Rhabdita
2- Ascaridida
3- Spiruria

Question 17

What is the family of the order Rhabdita?

Answer 17

Rhabditida

Question 18

What is an example of the family Rhabditida of the order Rhabita?

Answer 18

Caenorhabditis elegans

Question 19

Why are the family Rhabditida of the order Rhabita important?

Answer 19

Animals models for developmental genetics

Question 20

What is a family of the order Ascaridida?

Answer 20

Ascarididae

Question 21

Where are the Nematodas in the family Ascarididae in the order Ascaridida found?

Answer 21

All intestinal parasites of mammals

Question 22

What is an example of the family Ascarididae of the order Ascaridida?

Answer 22

Ascaris lumbricoides = severe parasite of humans

Question 23

Where are the order Spiruria found? Hosts?

Answer 23

Parasites of annelids and vertebrates

Arthropods are involuntary hosts

Question 24

What is the family of the order Spiruria?

Answer 24

Filaridae

Question 25

What is an example of the family Filaridae of the order Spiruria? Where it is found (thing/area)?

Answer 25

Wucharia bancrofti

Strictly humans in tropical areas

Question 26

What are the Nematoda in the family Filaridae of the order Spiruria called? What can they cause in humans?

Answer 26

Filarial parasites

Elephantiasis disease

Question 27

Where are the family Filaridae of the order Spiruria found?

Answer 27

Parasites of all vertebrates except fish