Spiders

Of the over 30,000 kinds of described spiders, about 200 attack humans. Severe injuries are most often from bites by species of the genera Latrodectus (widow spiders) and Loxoscleles (violin spiders) (51), and a few others, such as the Brazilian banana spider (Phoneutria nigriventer) and Sydney's funnel web spider (Atrax robustus) (52), which are also highly venomous. Because 80% of reported spider bites may be due to other etiologies, the wise physician will limit diagnoses to cases in which the spider is observed, preferably by the physician; parts of spiders oft suffice for speciation.

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