LAB 9

TICKS• Relatives to scorpions, mites and spiders

• Parasites (survival dependent on feeding on a host)

• GENERA – Hard Ticks (scutum)– Ixodes species (black – legged tick) • I. scapularis• Ixodes pacificus

– Dermacentor species (wood / dog tick)• D. variabilis (dog)• D. andersoni (wood)

Females can lay up to 8000 eggs on a leafAdults live for about 1 year

•Scutum is the hard shield found on the back • Covers entire back of males•1/3 of the back in females• Ixodes species (carries Lyme disease)

MALE FEMALE

IXODES Species TICK

A = anal groove

B = anus

White markings – Dermacentor sp.

MALE FEMALE

TICK

?WHITE MARKINGS

YES NO

DERMACENTOR SPECIES

(engorged/not engorged)

?ANAL GROOVE

YES

IXODES SPECIES(engorged/not engorged)

?SCUTUMYes…Hard Tick

TICK REMOVAL

DISEASES TRANSMITTED BY IXODES TICK

• LYME DISEASE•Causative agent: Borrelia burgdorferi • Spirochete in the stomach• Transmitted after tick engorged for 36 hours• Fever, headache, fatigue, target lesion

• BABESIOSIS•Causative agent: Babesia microti•Parasite infecting red blood cells

• ANAPLASMOSIS•Causative agent: •Anaplasma phagocytophilum• Bacterium infecting white blood cells

ClassicTarget Lesion

of Lyme

Disease