Parasitology - Arthropod 1 Flashcards

1
Q

Insects

A

3 body segments
6 legs
Egg, larva, pupa, adult

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2
Q

Ticks and mites

A

2 body segments
Larvae - 6 legs
Adults/nymphs - 8 legs
Egg, larva, nymph, adult

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3
Q

Simple vs complex life cycles

A

Simple: immature stages look like small adults
Complex: marked differences in morphology between stages

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4
Q

Flea (C. Felis) life cycle

A

Adults become permanent parasites to host
Females feed w immediate contact to host
Mate & lay eggs 24 hours later
Eggs (0.5mm) 6 days to hatch

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5
Q

Flea (C. Felis) life cycle - pupa

A

Hardest stage to kill, limited movement, stage can last for 6 months

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6
Q

Flea life cycle time frame

A

Egg hatching - 2 days
Larva - 6 days
Pupa - 6 days
TOTAL - 14 days

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7
Q

Flea population %

A

Eggs - 50%
Larvae - 35%
Pupae - 10%
Adult - 5%

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8
Q

What are fleas vectors for?

A

Tapeworms: diplyidiuym canium
Acanthocheilonema recondition
Bartonella henselae (cat scratch fever)

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9
Q

Other flea species

A

Rodent fleas: vector for Yersinia pestis
Stick tight flea: bird parasite

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10
Q

Order phthiraptera

A

Lice
Sucking - only in mammals
Biting - mammals & birds

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11
Q

Lice life cycle

A

Cycle all on host, eggs glued to hairs, 4 weeks

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12
Q

Why do lice populations increase during winter?

A

Thicker hair & body temp is favorable, close contact, stressed animals are more susceptible to lice

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13
Q

Lice clinical importance

A

SA: uncommon
EQ: uncommon but easy
LA: common
Birds: common in wild
Wild mammals: common

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14
Q

Key differences of flea & lice

A

Body- laterally / dorso-ventral compressed
Legs - jump / walking
Host - broad / narrow
Parasite - adult / all stages
Eggs - fall off / stuck to hairs
Immature - larvae / nymphs
Meta - complete / incomplete

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