1. Spiders Announcements Speaking today: April Nipper Next Thursday: Amanda Meadows Exam Results ….

2. Spiders All are predaceous. Almost all have venom. 3,000 genera & 40K spp. world wide; about 10% of them are in N. America.

3. Internal Morphology of Spiders

4. Medical Significance of Spiders Cause 3 types of problems –Envenomation (araneism) – poisoning from a venomous bite –Secondary infection from bites, especially MRSA MRSA = Methicillin-resistant Staphylococcus aureus –Phobic responses Araneophobia is the spider-specific form of Arachnophobia

5. Envenomation http://www.webmd.c om/erectile- dysfunction/news/20 090924/spider- venom-for-erectile- dysfunction

6. Most dangerous spider in the world Atrax robustus; Sydney Funnel Web Spider Sydney Australia Because: –Found in/near homes –Highly toxic venom –Large amount of venom –Extremely aggressive when provoked –Easily provoked Male venom more toxic than female venom but females produce more Venom only toxic to primates & humans Small children die within 15 min w/out antivenom; adults can live 2-3 days Useful video herehere

7. New Spider Threat in N America Hobo Spider