Mites Differentiation of ticks and mites ticks

Mites

Differentiation of ticks and mites ticks mites Large, macroscopic Small, microscopic Body with short or no hair Body with long hair Hypostome exposed and Hypostome hidden, armed with teeth unarmed (no teeth) All parasitic Some are parasites of plants and animals

Mites and diseases • I. Direct harm: • Itch mite: Sarcoptes scabiei var. hominis • Follicle mite: Demodex folliculor 毛囊蠕形螨 D. brevis 皮脂蠕形螨 • Dust mite: contain allergens causing asthmatic symptoms

毛囊蠕形螨雌（含卵）雄成虫

皮脂蠕形螨成虫

House Dust Mite Dermatophagoides sp. • House dust mites live in our homes and feed on the microbes that grow on cast skin flakes, hair, and other detritus. The average pillow is reputed to be home to 10, 000 dust mites, house dust mites are the most important source of allergens in house dust. Severe allergies, rhinitis, eczema (skin inflammation), and asthma (respiratory disorder) are induced by the allergens these mites produce and affect 50 -100 million people worldwide.

House Dust Mite Dermatophagoides sp.

Control of dust mite • Like most of the tiny organisms that share our homes, dust mites are less troubling if their population levels remain low. Reducing the humidity in the home (e. g. increased ventilation, air conditioning) and removing upholstered furniture, carpets and other household items that accumulate skin flakes and retain humidity are good first steps in the control of dust mite populations.

Transmission of disease • • • 1. Jungle encephalitis (virus) 2. Epidemic hemorrhagic fever (virus) 3. Q fever (rickettsia) 4. Endemic typhus 5. Scrub typhus (rickettsia)

Bulbous Carmine Mite

Boxmite

Cepheidae, nymph

Scrub itch mite or chigger

Cosmochthonius

Cosmochthonius sp. 2

House Dust Mite - Dermatophagoides sp.

Evimirus

Feather mite

Jumping mite

Mesostigmata

Lamington Red Velvet Mite

Walter's redlegged mite

Phoretic Uropodid Deutonymphs

Nesopelops nymph

Polyaspis

Mesostigmata, Promegistidae

Schizotetranychus sp. , female (left) and male (right)

Nanorchestid mites

Terpnacarus

Peacock mites

Turtle Mite

Whitefly with phoretic broad mites

Martian Wink This structure, is the genital opening of a terrestrial parasitengone mite and the three oval structures are the genital papillae.

Male Australian Paralysis Tick