10 Arachnophobia

10 Arachnophobia - Arachnophobia Arachnophobia. Noun....

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Arachnophobia Arachnophobia . Noun . Etymology, Greek arachnos = spider; phobos = fear 1 : pathological fear or loathing of spiders
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Phylum Arthropoda Class Insecta Other classes For example, Crustacea Class Arachnida
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Insects vs. Arachnids Arachnids have: Eight legs No antennae, but pedipalps Mouthparts are called chelicerae 2 stout, claw-like structures (mites, ticks) base + 2 fangs (spiders) Not 3 main body parts, but 1 (in mites and ticks) 2 (in spiders)
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Lone star tick Eriophyid mite Class Arachnida – Order Acarina Mites and Ticks
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Top View Bottom View
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Palp AKA Pedipalp – serves a sensory function like antennae in insects
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Mites Usually pretty small, from minute @ 0.08 mm …to largest - African aquatic mite @ 16 mm 48,000 described species, but thought to be close to 500,000!
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Ecological Roles A wide variety feeding roles : Plant feeders Predators Decomposers Parasites of mammals, birds, insects A wide variety of habitats : Fresh water On plants In soil House dust In insect tracheae!
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Peacock mite (plant feeder) Uropodid mite (soil-decomposer) Varroa mite on honeybee (adults predatory, larvae chiggers ’-bore into skin) Red velvet mite
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Mites on Honey Bees Varroa mites Tracheal mites
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This note was uploaded on 11/08/2011 for the course PPSC 110 taught by Professor Staff during the Fall '04 term at Cal Poly.

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10 Arachnophobia - Arachnophobia Arachnophobia. Noun....

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