Atrax robustusVery Dangerous Bites repeatedly and envenomates enthusiastically. (Ａustralian Venomous Funnel-web Spiders aggressively stand their ground.)
Range of the two genera (Hadronyche and Atrax) of venomous Australian funnel-web spiders.
Very dangerous Spiders of the genus Phoneutria aggressively stand their ground and are extremely venomous, but often give dry bites. (Brazilian Wandering Spiders)
Latrodectus mactansVery dangerous Spiders of the genus Latrodectus typically avoid contact if at all possible. (There are many venomous "widow" spiders world-wide. Although venom quantities are lower than Atrax or phoneutria genera, due to their wide distribution they cause more deaths worldwide than any other spiders.)
Latrodectus species occur in almost all areas, worldwide, that are not terribly cold in the wintertime. Note that parts of Africa are an exception to this generality.
Loxoceles reclusa (Brown Recluse) Dangerous Spiders of the genus Loxoceles may end up in your bed or in undisturbed clothing. S. American species are the more dangerous. Necrotic venom can produce severe damage, but rarely causes death.
Tegenaria agrestisAllegedly angerous. May end up in your bed or in undisturbed clothing. (Hobo spiders in the U.S. have been implicated in medically significant bites but the same species is not known to be a problem biter in Europe. They are not aggressive, and necrosis subsequent to bites may be caused by infections.)
Chiracanthium inclusum(?). Troublesome symptoms; not known to be fatal. (Yellow sac spider) Body length 8 mm.
Tarantulas of the genus Poecilotheria are reported to give bites that can sometimes produce spasms or "cramps" of great intensity and duration. The species that is reported to produce the most serious symptoms is striata (Mysore Ornamental).