Parasitology Week 2

Within the sub-order CYCLORRHAPHA what are the relevent families?

Which stage(s) within the family Oestridae are parasitic

This text reveals the differences between the three species of horse bot found in Australia, fill in the blanks G. intestinalis eggs [blank_start]yellow[blank_end], anywhere on front of body, Flies active in [blank_start]summer[blank_end] only live for a few days can lay many eggs hatch when [blank_start]licked[blank_end] G. nasalis eggs [blank_start]pale[blank_end], laid [blank_start]between mandibles[blank_end], hatch [blank_start]spontaneously[blank_end] G. haemorrhoidalis eggs [blank_start]black[blank_end], laid [blank_start]around lips[blank_end], hatch spontaneously

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.

How long can the larvae of Gastrophilus remain in the horse?

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

What statements are true of Oestrus ovis

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

How does Oestrus ovis effect the sheep?

Are any species of Hypoderma present in Australia?

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

Which of the below species belong to the family Muscidae?

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

[blank_start]Lucilia cuprina[blank_end] an introduced species and which causes 90% of strikes along with Lucilia sericata also introduced and found mainly in urban areas are both [blank_start]Green[blank_end] species of fly and have [blank_start]1º[blank_end] roles in fly strike Chrysomya rufifacies and Chrysomya varipes are both native species of green fly, both primarily have [blank_start]2º[blank_end] roles in fly strike The [blank_start]Brown[blank_end] species Calliphora stygia and Calliphora augur (both natives) generally have 2º roles in fly strike The native [blank_start]Black[blank_end] species Ophyra spp. has 3º roles in fly strike Calliphora vicina an introduced [blank_start]Blue[blank_end] species that lives in Urban areas has [blank_start]3º[blank_end] roles in fly strike Sarcophaga spp. are native [blank_start]Flesh flies[blank_end] that have 3º roles in fly strike

Lucililia cuprina is responsible for > 90% of strikes on sheep

Which larval stage is able to penetrate the skin of the sheep to begin feeding on flesh?

Identify this species of Calliphoridae. -responsible for > 90% of strikes -almost obligate parasite (can breed in carcases but outcompeted) -first instar needs protein meal (cannot penetrate skin) -second instar penetrates skin (feeds on flesh) -pupates under soil -1º role in fly strike -Antennae aristate -Mouthparts well developed -Mouthparts stouter, pendant, fleshy -Thorax without longitudinal stripes dorsally -Abdomen green -Abdominal segments lacking thick dark bands

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