PHYLUM NEMATODA (roundworm)

Question 1

morphology

Answer 1

unsegmented, elongated, cylindrical worms

Question 2

are they dioecious?

Answer 2

YES

Question 3

Who is smaller?

Answer 3

Male –> curved or coiled posterior portion

Question 4

the supporting body wall consist of what?

Answer 4

1. cuticle (hyaline and non-cellular)
2. subcuticular epithelium/ hypodermis
3. somatic musculature

Question 5

function of subcuticular epithelium/ hypodermis

Answer 5

responsible for the secretion of the cuticle

Question 6

3 parts of the cuticle

Answer 6

• Cortical layer – outermost layer composed of collagen and cuticulin
• Homogenous matrix – the middle layer
• Fibrous layer

Question 7

somatic musculature contains what?

Answer 7

layer pf muscle cells

platymyarian & coelomyarian

Question 8

where does the digestive, excretory and reproductive system reside?

Answer 8

pseudocele/ pseudocoeleum

Question 9

what is the fluid in the pseudocele called and what is it’s function?

Answer 9

hemolymph - fulfills the function of blood

Question 10

digestive tract consist of?

Answer 10

mouth
buccal cavity 
esophagus
intestine 
rectum

Question 11

located at the anterior end; maybe equipped with hooks,teeth, plates and other structures for the purpose of abrasion, attachment and sensory response

Answer 11

Mouth

Question 12

tubular or funnel-shaped, which in some species is expanded for sucking purposes

Answer 12

Buccal cavity

Question 13

types of esophagus

Answer 13

filariform
rhabditiform 
sipuroid
strongyllifrom 
stichosoma

Question 14

simple, long and slender

Answer 14

filariform

ex. strongyloides

Question 15

divided into distal corpus, an isthmus and esophageal bulb

Answer 15

rhabditiform

ex. enterobius

Question 16

anterior portion muscular, posterior glandular

Answer 16

sipuroid

ex. filairal worms

Question 17

short, muscular with a waist

Answer 17

strongyllifrom

ex. ancylostoma

Question 18

long, thin, capillary-like lined with esophageal glands cells known as
stichocytes or stichosomes

Answer 18

stichosoma

ex. trichuris, trichinella and capillaria

Question 19

absorbs nutrients and plays a role in excretion of nitrogenous waste

Answer 19

intestine/ midgut