12%20Arachnids09[1]

12%20Arachnids09[1] - XII. Subphylum Chelicerata, Class...

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45 XII. Subphylum Chelicerata, Class Arachnida (Chapter 41) 2009 A. Characteristics 1. CHELICERAE a. Mouth appendages b. Move up and down = stab 2. No antennae B. Class Arachnida 1. Usually 8 legs 2. Body with 2 divisions Slide #1: Generalized Mite, Ventral View, Figure 41.12; p. 649; 8 th ed. C. Order Acari 1. Body divisions fused (Give appearance of one) 2. Development a. Egg b. Larvae (= 6 legs) c. Nymphs (= 8 legs) d. Adult (reproductive) 3. Ticks a. Macroscopic b. Blood feeders Slide: Engorged lone star tick; Bowman, A. & V. Beregovoy 1996 Parasitology Today , 12:(10): cover 4. Mites a. Usually microscopic b. Skin & lymph feeders (Cannot penetrate to blood vessels) Video: Ear mite from dog; L. Erickson, 2006 D. Family Ixodidae 1. Hard ticks 2. Capitulum (contains mouthparts) visible dorsally 3. Free living after feeding a. Life cycle involves feeding on many hosts b. Good vectors (1) Rocky Mountain spotted fever (Fig. 41-5, p. 643) (2) Encephalitis 3. Ixodes dammini a. Deer tick b. Larvae or “seed ticks” have only 6 legs (Fig. 41-2, p. 641)
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12%20Arachnids09[1] - XII. Subphylum Chelicerata, Class...

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