Parasitology Week 2

Where are the parasitic larval stages of Gasterophilus located within the horse?

Identify this species of OESTRIDAE Gastrophilus.

Eggs laid between mandibles, eggs are pale, eggs hatch spontaneously.
Third instar has spines arranged in 1 row.

Identify this species of Oestridae Gasterophilus?

Eggs are laid anywhere on the body of the horse, eggs are yellow, eggs require moisture and friction to hatch.
Spines in 2 rows, spines slender and blunt tipped, double row reaches 10th or 11th segments dorsally and ventrally.
Mouth hooks have a saddle like depression

Identify this species of Oestridae Gasterophilus

Eggs black, laid around lips, hatch spontaneously.
Spines in 2 rows, pines small; ventral side of segment 3 with 1 medially interrupted row of spins.
Mouth hooks uniformly bent

Identify this species of Oestridae.

Found in the nasal cavity of sheep.
The larvae have large black oral hooks and rows of small spines on the ventral surface only.
Larvae are dark yellow in colour

Identify this species of Oestridae.

Large fly (15mm), hairy, no functional mouth parts, hairs on head, anterior thorax is yellow-white.
Eggs laid singly high up on legs, hocks and knees, or even on rump.
Usually parasitise cattle
Larvae penetrate skin and migrate via the epidural fat and encyst on back
Larvae pupate on ground, larvae robust and rounded at both ends, rudimentary mouth hooks, small spines present

Identify this species of Muscidae.

Small grey fly
Introduced into Australia from South East Asia
Feed on cattle, buffalo, dogs and horses
Antennae aristate
Mouth parts well developed--> Mouth parts slender, erect and rigid
Flies remain on host (die in 1-2 days away from host). Only leave host to lay eggs (breed in cow dung)

Host effects--bites are painful, cattle rub to relieve irritation, 2000-3000 flies a heavy infection, loss of condition
Control-- fly traps, insecticides

Identify this species of Calliphoridae

-feeds on other maggots
-Antennae aristate
-Mouthparts well developed
-Mouthparts stouter, pendant, fleshy
-Thorax without longitudinal stripes dorsally
-Abdomen green
-Abdominal segments with thick dark bands on anterior margin

Identify this species of Calliphoridae.

-not present in Australia
-blue blowfly
-Antennae aristate
-eggs laid at edges of wounds
-larvae are large (up to 14 mm) densely covered with small black spines which bands on segments.
-larvae penetrate tissues, liquefying the tissues and extending the wound