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Entomology > Ticks and Mites > Flashcards

Ticks and Mites Flashcards

1
Q

Hypostome

A

Central mouthpart found only on ticks

Purpose is to anchor tick onto host

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2
Q

Haller’s Organ

A

Small circular vesicle on the tarsal segment of the first pair of legs.
Only in ticks
Purpose is to detect odours

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3
Q

Hard Tick Features

A 
• Mouthparts visible from dorsal
surface
• Scutum present – an inflexible
plate on the dorsal surface
• Sexual dimorphism well marked
• Attach to hosts for days, take
one large bloodmeal
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4
Q

Hard Tick Female

A

Scotum only partially covers dorsal surface

Porose areas on the basis capitulum

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5
Q

Hard Tick Male

A

Scutum covers the entire dorsal surface

Basis capitulum lacks porose areas

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6
Q

Hard Tick Larva

A

Only 3 pairs of legs
Scutum present, only partially covers dorsal surface
Mouthparts are clearly visible from the dorsal surface
Basis capitulum is clearly defined

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7
Q

Hard Tick Nymph

A

4 pairs of legs
Scutum is present and only partially covers the dorsal surface
No genital aperture
No porose areas on the basis capitulum

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8
Q

Ixodes ricinus

A

Common sheep tick

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9
Q

Ixodes Genus

A

Inornate
No eyes
Anal groove runs anteriorly around the anus
Vector of Lyme disease

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10
Q

Hyalomma Genus

A

Has eyes
Scutum is inornate
Legs may have pale bands
Palps long - article II less than twice as long as III
Vectors of Crimean-Congo Haemorrhagic Fever (CCHF)

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11
Q

Amblyomma Genus

A

Ornate scutum
Has eyes
Long palps - article II more than twice as long as III
Vectors of rickettsiae

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12
Q

Dermacentor Genus

A 
Typically ornate scutum
Has eyes
Basis capitulum is rectangular
Short palps - article II and III together are shorter than the width of the basis
Vectors of rickettsiae
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13
Q

Soft Tick Features

A

Mouthparts not visible from dorsal surface
Scutum absent
Sexual dimorphism slight
Take regular bloodmeals

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14
Q

Soft Tick Larva

A

3 pairs of legs
No scutum
Mouthparts are visible from the dorsal surface but partly recessed behind the body margin
Palps are more finger-like

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15
Q

Ornithodoros Genus

A

Possess a mammillated integument (one that is covered in rounded protuberances)
No distinct margin between the dorsal and lateral body surfaces
Vectors and reservoirs of the borreliae

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16
Q

Soft Tick Mouthparts

A

Located ventrally in nymph and adult soft ticks
Four-segmented palps are more flexible and finger-like than the palps of hard ticks
Chelicerae are used to cut into the host
Hypostome has several rows of back pointing teeth

17
Q

Argas Genus

A

Bird ticks
Larval stages will remain attached to their hosts and feed for several days
Unfed ticks are dorso-laterally flattened
Clear marginal line between the dorsal and ventral body surfaces

18
Q

Otobius Genus

A

Integument of the nymph is covered in small spines
No clear suture line between the dorsal and ventral body surface
Larvae enter the ear canals of animals (and occasionally man)
Nymphs may attach for several
months

19
Q

Mite Features

A

Very small 0.09mm -15mm

Toothed hypostome/Haller’s organ absent

20
Q

Trombiculid Adult

A

1.0 – 2.0 mm in length
Body is covered in feathery setae giving it a velvety appearance (kind of looks like a hairy spider)
Body outline is figure of eight
Palps and capitulum are conspicuous

21
Q

Trombiculid Larvae

A

Very small, only 0.25 mm long
Circular in outline
Covered in many feathered setae
Prominent capitulum with toothed chelicerae
Conspicuous palps
Presence of a sclerotised scutum bearing 7 setae

22
Q

Scabies Mites (Sarcoptes scabei)

A

Small, globose mites with a distinct capitulum and a finely striated cuticle
Legs are short and stumpy with the anterior pair ending in stalked pulvilli

23
Q

Male Scabies Mites

A

Fourth pair of legs also end in pulvilli and help to secure during mating
Conspicuous genitalia

24
Q

House Dust Mites (Dermatophagoides spp.)

A

Small (0.3 mm long) with well developed capitulum and legs
Thin skinned and lack shields or stigmata
2 pairs of long posterior marginal setae

25
Q

Female House Dust Mite

A

Distinctive genital opening

26
Q

House Dust Mite Nymphs

A

Similar to adults but more rounded and lack genitalia

2 pairs of long posterior marginal setae

27
Q

House Dust Mite Protonymph

A

Presence of 1 pair of genital pores

28
Q

House Dust Mite Tritonymph

A

Presence of 2 pairs of genital pores

29
Q

Follicle Mites (Demodex spp.)

A

Elongate mites with a conspicuous capitulum, short stumpy legs and a striated body
Can cause acne, rosacea, impetigo contagiosa or blepharitis in sensitized individuals

Entomology (6 decks)

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