Order Oxyurida

Question 1

What are general features of Oxyurida worms?

Answer 1

• females (long pointed tails = pinworms)
• males (much smaller than females)
• asymmetrical eggs
• large intestines
• direct life cycle

Question 2

What are Oxyuris equi features?

Answer 2

• in horses, large intestines
• adults are in the lumen of the large intestine.
• eggs - thick shelled, asymmetrical with mucoid plug at one end females lay them at horse anus in viscous/gelatinous substance.

Question 3

What are the super families of Spirurida?

Answer 3

• superfamily spiruroidea

- superfamily filarioidea

Question 4

What are the general features of superfamily spiruroidea?

Answer 4

• there’s a range of shapes
• mouth without lips or may have 2-4 lips
• no buccal capsule
• male posterior = coiled
• indirect life cycles

Question 5

What are the features of Draschia megastoma?

Answer 5

• horses
• adults are in the stomach
• larvae are in the skil
• they have big mouths (funnal shaped).
• eggs have larvae which hatch quickly
• IH = muscid flies and it goes from L1 - L3 in the fly.
• two areas that the infected fly deposits parasite = around the mouth (gastric habronemosis) or into wounds, periocuar areas or penis (cutaneous/pulmonary habronemosis).

Question 6

What is a species from family Spirocercidae?

Answer 6

Spirocerca lupi which is in dogs 
- adults oesophagus wall 
- immature = stomach and dorsal aorta. 
IH = dung beetles 
PH = snakes or mice

Question 7

Where are Ascarops strongylina found?

Answer 7

• pigs in the stomach

Question 8

What are some features of Gnathostoma spp?

Answer 8

• anterior end = cuticular swelling with 9-11 rows of sharp hooks
• body that is covered with spines that are scalelike anteriorly

Question 9

Where is Thelazia rhodes found?

Answer 9

• in cattle, sheep, goats in the conjuctical sac or lacrimal duct.

Question 10

What are Thelazia rhode features?

Answer 10

• white worms
• cuticle with striations
• wide vesitbule
  IH = flies

Question 11

Where are Thelazia callipaeda found?

Answer 11

• dogs, cats and humans in the conjuctiva sac under the lid or nictitating membrane

Question 12

Where are Oxyspirura mansoni found?

Answer 12

in chickens and ducts in the corner of the orbit or under the nictitating membrane. it can cause blindness.
IH = cockrocaches

Question 13

Where are gongylonema pulchrum found?

Answer 13

• sheep, cattle, pigs and goats in the mucosa or submucosa of oesphagus.
  these are nonpathogenic or may cause mild oesophagitis.
  IH - cockroaches and beetles.